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{{short description|Animal flesh eaten as food}}
Human flesh
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{{Use American English|date=April 2024}}

], ], ], ]s]]

'''Meat''' is animal ], often ], that is eaten as food. Humans have hunted and farmed other animals for meat since prehistory. The ] allowed the ], including ]s, ], ]s, ]s, ]s, and ], starting around 11,000 years ago. Since then, ] has enabled farmers to produce meat with the qualities desired by producers and consumers.

Meat is mainly composed of water, protein, and fat. Its quality is affected by many factors, including the genetics, health, and nutritional status of the animal involved. Without preservation, bacteria and fungi decompose and ] within hours or days. Meat is ], but it is normally eaten cooked, such as by ] or ], or ], such as by ] or ].

The consumption of meat (especially red and processed meat) increases the risk of certain negative health outcomes including cancer, ], and ]. Meat production is a major contributor to ] including ], pollution, and ], at local and global scales. Meat is important to economies and cultures around the world, but some people (] and ]) choose not to eat meat for ], environmental, health or religious reasons.


== Etymology == == Etymology ==

The word ''meat'' comes from the ] word ''mete'', which referred to food in general. The term is related to ''mad'' in ], ''mat'' in ] and ], and ''matur'' in ] and ], which also mean 'food'. The word ''mete'' also exists in ] (and to a lesser extent, modern ]) to denote important food, differentiating it from ''swiets'' (sweets) and ''dierfied'' (animal feed).
The word ''meat'' comes from the ] word {{Lang|ang|mete}}, meaning food in general. In modern usage, ''meat'' primarily means ] with its associated fat and connective tissue, but it can include ], other edible organs such as ] and ].{{sfn|Lawrie|Ledward|2006|pp=1–2}} The term is sometimes used in a more restrictive sense to mean the flesh of ]ian species (pigs, cattle, sheep, goats, etc.) raised and prepared for human consumption, to the exclusion of ], other seafood, ], poultry, or other animals.<ref>{{Cite web |url=https://www.collinsdictionary.com/dictionary/english/meat|title=Meat definition and meaning |publisher=Collins English Dictionary |access-date=June 16, 2017|archive-url=https://web.archive.org/web/20170712041548/https://www.collinsdictionary.com/dictionary/english/meat|archive-date=July 12, 2017 |url-status=live}}</ref><ref name="Definition of MEAT">{{Cite web |url=https://www.merriam-webster.com/dictionary/meat|title=Definition of MEAT |website=merriam-webster.com |access-date=June 16, 2017 |archive-url=https://web.archive.org/web/20180319025828/https://www.merriam-webster.com/dictionary/meat |archive-date=March 19, 2018 |url-status=live}}</ref>


== History == == History ==
{{See also|History of agriculture}}
] evidence suggests that meat constituted a substantial proportion of the diet of even the earliest humans.<ref name="Lawrie" />{{rp|2}} Early ]s depended on the organized hunting of large animals such as ] and ].<ref name="Lawrie" />{{rp|2}}


{{further|History of agriculture}}
The ] of animals, of which we have evidence dating back to the end of the ] (c. 10,000 BC),<ref name="Lawrie" />{{rp|2}} allowed the systematic production of meat and the ] of animals with a view to improving meat production.<ref name="Lawrie" />{{rp|2}} The animals which are now the principal sources of meat were domesticated in conjunction with the development of early civilizations:
]]]
* ], originating from western Asia, were domesticated with the help of dogs prior to the establishment of settled ], likely as early as the 8th millennium BC.<ref name="Lawrie" />{{rp|3}} Several breeds of sheep were established in ancient ] and ] by 3500–3000 BC.<ref name="Lawrie" />{{rp|3}} Presently, more than 200 ] exist.
* ] were domesticated in Mesopotamia after settled agriculture was established about 5000 BC,<ref name="Lawrie" />{{rp|5}} and several breeds were established by 2500 BC.<ref name="Lawrie" />{{rp|6}} Modern domesticated cattle fall into the groups '']'' (European cattle) and '']'' (zebu), both descended from the now-extinct ].<ref name="Lawrie" />{{rp|5}} The breeding of ], cattle optimized for meat production as opposed to animals best suited for draught or dairy purposes, began in the middle of the 18th century.<ref name="Lawrie" />{{rp|7}}
] bull, a breed of cattle frequently used in beef production.]]
* ]s, which are descended from ]s, are known to have existed about 2500 BC in modern-day Hungary and in ]; earlier pottery from ] and Egypt depicts wild pigs.<ref name="Lawrie" />{{rp|8}} ] sausages and ]s were of great commercial importance in ] times.<ref name="Lawrie" />{{rp|8}} Pigs continue to be bred intensively as they are being optimized to produce meat best suited for specific meat products.<ref name="Lawrie" />{{rp|9}}
Other animals are or have been raised or hunted for their flesh. The type of meat consumed varies much between different cultures, changes over time, depending on factors such as tradition and the availability of the animals. The amount and kind of meat consumed also varies by income, both between countries and within a given country.<ref>Mark Gehlhar and William Coyle, , Chapter 1 in , edited by Anita Regmi, May 2001. USDA Economic Research Service.</ref>
* ] are commonly eaten in France,<ref>Chrisafis, Angelique ''The Guardian'', June 15, 2007, London.</ref> Italy, Germany and ], among other countries.<ref>Alan Davidson (2006). Tom Jaine, Jane Davidson and Helen Saberi. ed. ''The Oxford Companion to Food.'' Oxford: Oxford University Press. ISBN 0-19-280681-5, pp. 387-388</ref> Horses and other large ]s such as ] were hunted during the late ] in western Europe.<ref>Turner, E. 2005. "Results of a recent analysis of horse remains dating to the Magdalenian period at Solutre, France," pp 70-89. In Mashkour, M (ed.). ''Equids in Time and Space.'' Oxford: Oxbow</ref>
* ] are consumed in ],<ref>{{cite web|url=http://news.bbc.co.uk/2/hi/programmes/from_our_own_correspondent/2074073.stm|title=BBC NEWS – Programmes – From Our Own Correspondent – China's taste for the exotic|work=bbc.co.uk}}</ref> ]<ref>{{cite journal | last1 = Podberscek | first1 = A. L. | title = Good to Pet and Eat: The Keeping and Consuming of Dogs and Cats in South Korea | doi = 10.1111/j.1540-4560.2009.01616.x | journal = Journal of Social Issues | volume = 65 | issue = 3 | pages = 615–632 | year = 2009 | url = http://www.animalsandsociety.org/assets/265_podberscek.pdf| format=PDF| pmid = | pmc = }}</ref> and ].<ref>{{cite web|url=http://news.bbc.co.uk/2/hi/asia-pacific/1735647.stm|title=BBC NEWS – Asia-Pacific – Vietnam's dog meat tradition|work=bbc.co.uk}}</ref> Dogs are also occasionally eaten in the ] regions.<ref></ref> Historically, dog meat has been consumed in various part of the world, such as ],<ref>Schwabe, Calvin W. (1979). Unmentionable cuisine. University of Virginia Press. p. 168. ISBN 978-0-8139-1162-5. https://books.google.com/books?id=SiBntk9jGmoC.</ref> Japan,<ref>Hanley, Susan B. (1999). Everyday things in premodern Japan: the hidden legacy of material culture. University of California Press. p. 66. ISBN 0-520-21812-4. https://books.google.com/?id=f7E5a9CIploC&pg=PA66&dq=dog#v=onepage&q=dog.</ref> ]<ref>Schwabe, Calvin W. (1979). Unmentionable cuisine. University of Virginia Press. p. 173. ISBN 978-0-8139-1162-5. https://books.google.com/books?id=SiBntk9jGmoC.</ref> and ].<ref>Alan Davidson (2006). Tom Jaine, Jane Davidson and Helen Saberi. ed. ''The Oxford Companion to Food.'' Oxford: Oxford University Press. ISBN 0-19-280681-5, pp. 491</ref>
* ] are consumed in Southern China and ].<ref>{{cite web|title=Carapulcra de gato y gato a la parrilla sirven en fiesta patronal |url=http://www.cronicaviva.com.pe/index.php/regional/costa/3749-carapulcra-de-gato-y-gato-a-la-parilla-sirven-en-fiesta-patronal- |work=Cronica Viva |accessdate=December 1, 2011 |deadurl=yes |archiveurl=https://web.archive.org/web/20101117142920/http://cronicaviva.com.pe/index.php/regional/costa/3749-carapulcra-de-gato-y-gato-a-la-parilla-sirven-en-fiesta-patronal- |archivedate=November 17, 2010 }}</ref>
* ]s are raised for their flesh in the ].<ref>{{cite news|title=A Guinea Pig for All Times and Seasons|url=http://www.economist.com/node/2926169|work=The Economist|accessdate=December 1, 2011|date=July 15, 2004}}</ref>
* ]s and ]s are hunted, partly for their flesh, in Japan, ], ], Canada, the ], ], ], ] and by two small communities in ].<ref>{{cite web|title=WHALING IN LAMALERA-FLORES|url=http://www.profauna.net/sites/default/files/downloads/publication-2005-whaling-in-lamalera.pdf|accessdate=April 10, 2013}}</ref>


=== Domestication ===
Modern agriculture employs a number of techniques, such as ], to speed ] by breeding animals to rapidly acquire the qualities desired by meat producers.<ref name="Lawrie" />{{rp|10}} For instance, in the wake of well-publicised health concerns associated with ]s in the 1980s, the fat content of United Kingdom beef, pork and lamb fell from 20–26 percent to 4–8 percent within a few decades, due to both selective breeding for leanness and changed methods of ].<ref name="Lawrie" />{{rp|10}} Methods of ] aimed at improving the meat production qualities of animals are now also becoming available.<ref name="Lawrie" />{{rp|14}}


{{further|Domestication}}
] in North America]]
Even though it is a very old industry, meat production continues to be shaped strongly by the evolving demands of customers. The trend towards selling meat in pre-packaged cuts has increased the demand for larger breeds of cattle, which are better suited to producing such cuts.<ref name="Lawrie" />{{rp|11}} Even more animals not previously exploited for their meat are now being farmed, especially the more agile and mobile species, whose muscles tend to be developed better than those of cattle, sheep or pigs.<ref name="Lawrie" />{{rp|11}} Examples are the various ] species, the ], ] and ],<ref name="Lawrie" />{{rp|11ff}} as well as non-mammals, such as the ], ] and ].<ref name="Lawrie" />{{rp|13}} Another important trend in contemporary meat production is ] which, while providing no ] benefit to meat so produced,<ref>Lawrie, 11, citing ''Ollson, V., Andersson, I., Ranson, K., Lundström, K. (2003) Meat Sci. 64, 287'' and noting also that organically reared pigs "compare unfavourably" with conventionally reared ones "in some respects."</ref> meets an increasing demand for organic meat.{{citation needed|date=February 2013}}


] evidence suggests that meat constituted a substantial proportion of the diet of the earliest humans. Early ]s depended on the organized hunting of large animals such as ] and ]. Animals were ] in the ], enabling the systematic production of meat and the ] of animals to improve meat production.{{sfn|Lawrie|Ledward|2006|pp=1–2}}
==Consumption==
Meat consumption varies worldwide, depending on cultural or religious preferences, as well as economic conditions. ] choose not to eat meat because of ethical, economic, environmental, religious or health concerns that are associated with meat production and consumption.


{|class="wikitable" style="margin:1em auto;"
{{Multiple image |direction=vertical |align=right |width=300|image1=Meat Atlas 2014 -- Meat Consumption in industrialised countries.png|image2=Meat Atlas 2014 meat consumption developing countries.png |caption1=While meat consumption in most industrialized countries is at high, stable levels...<ref>] 2014 – Facts and figures about the animals we eat , page 46, download as </ref>|caption2=... meat consumption in emerging economies is on the rise.<ref>] 2014 – Facts and figures about the animals we eat , page 48, download as </ref>}}
|+ Major animal domestications
|-
! Animal !! ] !! Purpose !! Date/years ago
|-
|], ], ], ] ||Near East, South Asia ||Food ||11,000–10,000<ref name="McHugo Dover MacHugh 2019">{{Cite journal |last1=McHugo |first1=Gillian P. |last2=Dover |first2=Michael J. |last3=MacHugh |first3=David E. |date=2019-12-02 |title=Unlocking the origins and biology of domestic animals using ancient DNA and paleogenomics |journal=BMC Biology |volume=17 |issue=1 |pages=98 |doi=10.1186/s12915-019-0724-7 |pmc=6889691 |pmid=31791340 |doi-access=free }}</ref>
|-
|] ||East Asia ||] ||7,000<ref name="Lawler Adler 2012">{{cite journal |last1=Lawler |first1=Andrew |last2=Adler |first2=Jerry |title=How the Chicken Conquered the World |url=http://www.smithsonianmag.com/history/how-the-chicken-conquered-the-world-87583657/ |journal=] |issue=June 2012 |date=June 2012}}</ref>
|-
|] ||Central Asia ||], ] ||5,500<ref name="MacHugh Larson Orlando 2017">{{cite journal |last1=MacHugh |first1=David E. |last2=Larson |first2=Greger |last3=Orlando |first3=Ludovic |title=Taming the Past: Ancient DNA and the Study of Animal Domestication |doi=10.1146/annurev-animal-022516-022747 |journal=] |volume=5 |date=2017 |s2cid=21991146 |pmid=27813680 |pages=329–351}}</ref>
|}


=== Intensive animal farming ===
According to the analysis of the FAO the overall consumption for ] between 1990 and 2009 has dramatically increased. For example, poultry meat has increased by 76.6% per kilo per capita and pig meat by 19.7%. However, on the contrary, bovine meat has decreased from {{convert|10.4|kg}}/capita in 1990 to {{convert|9.6|kg}}/capita in 2009.<ref>{{cite journal|title = Meat consumption: Trends and quality matters|url = http://www.sciencedirect.com/science/article/pii/S0309174014001752|journal = Meat Science|date = 2014-11-01|pages = 561–568|volume = 98|series = Meat Science, Sustainability & Innovation: ‘60th International Congress of Meat Science and Technology 17–22 August 2014, Punta del Este, Uruguay’|issue = 3|doi = 10.1016/j.meatsci.2014.06.007|pmid = 25060586|first = Maeve|last = Henchion|first2 = Mary|last2 = McCarthy|first3 = Virginia C.|last3 = Resconi|first4 = Declan|last4 = Troy}}</ref>


{{further information|List of countries by meat consumption}} {{further|Intensive animal farming}}


In the ], governments gave farmers ] to increase animal production. The effect was to raise output at the cost of increased inputs such as of animal feed and veterinary medicines, as well as of animal disease and environmental pollution.<ref>{{cite web |last=Zatta |first=Paolo |title=The History of Factory Farming |url=http://www.unsystem.org/SCN/archives/scnnews21/ch04.htm#TopOfPage |archive-url=https://web.archive.org/web/20131116060714/http://www.unsystem.org/SCN/archives/scnnews21/ch04.htm |archive-date=16 November 2013 |publisher=United Nations |url-status=dead}}</ref> In 1966, the United States, the United Kingdom and other industrialized nations, began factory farming of beef and dairy cattle and domestic pigs.<ref name="Danielle Nierenburg 2005"/> Intensive animal farming became globalized in the later years of the 20th century, replacing traditional stock rearing in countries around the world.<ref name="Danielle Nierenburg 2005">{{cite journal |last=Nierenburg |first=Danielle |year=2005 |title=Happier Meals: Rethinking the Global Meat Industry |journal=] |volume=171 |page=5 }}</ref> In 1990 intensive animal farming accounted for 30% of world meat production and by 2005, this had risen to 40%.<ref name="Danielle Nierenburg 2005"/>
== Growth and development of meat animals ==

] has identified several factors bearing on the growth and development of meat in animals.
=== Selective breeding ===

Modern agriculture employs techniques such as ] to speed ], allowing the rapid acquisition of the qualities desired by meat producers.{{sfn|Lawrie|Ledward|2006|pp=10–14}} For instance, in the wake of well-publicized health concerns associated with ]s in the 1980s, the fat content of United Kingdom beef, pork and lamb fell from 20–26 percent to 4–8 percent within a few decades, due to both selective breeding for leanness and changed methods of butchery.{{sfn|Lawrie|Ledward|2006|pp=10–14}} Methods of ] that could improve the meat-producing qualities of animals are becoming available.{{sfn|Lawrie|Ledward|2006|pp=10–14}}

Meat production continues to be shaped by the demands of customers. The trend towards selling meat in pre-packaged cuts has increased the demand for larger breeds of cattle, better suited to producing such cuts.{{sfn|Lawrie|Ledward|2006|pp=10–14}} Animals not previously exploited for their meat are now being farmed, including mammals such as ], zebra, ] and camel,{{sfn|Lawrie|Ledward|2006|pp=10–14}} as well as non-mammals, such as crocodile, ] and ostrich.{{sfn|Lawrie|Ledward|2006|pp=10–14}} ] supports an increasing demand for meat produced to that standard.<ref>{{cite web |url=http://www.foodnavigator.com/Market-Trends/Demand-for-organic-meat-on-the-rise-says-Soil-Association |title=Demand for organic meat on the rise, says Soil Association |date=July 28, 2016 |access-date=January 21, 2018 |archive-url=https://web.archive.org/web/20161012021608/http://www.foodnavigator.com/Market-Trends/Demand-for-organic-meat-on-the-rise-says-Soil-Association|archive-date=October 12, 2016 |url-status=live}}</ref>

<gallery class=center mode=nolines widths=220 heights=180>
File:Lamb meat.jpg|A shoulder of ]
File:Hereford bull large.jpg|A ] bull, a breed of beef cattle
File:SelectionOfPackageMeats.jpg|Supermarket meat, North America
</gallery>

== Animal growth and development ==

Several factors affect the growth and development of meat.


=== Genetics === === Genetics ===

{| class="wikitable" style="float:right; margin:10px"
{|class="wikitable" style="float:left; margin:10px"
|- |-
! Trait ! Trait
! Heritability<ref>Table adapted from Lawrie, 17.</ref> ! Heritability{{sfn|Lawrie|Ledward|2006|pp=17–22}}
|- |-
| Reproductive efficiency |Reproductive efficiency
| 2–10% |2–10%
|- |-
| Meat quality |Meat quality
| 15–30% |15–30%
|- |-
| Growth |Growth
| 20–40% |20–40%
|- |-
| Muscle/fat ratio |Muscle/fat ratio
| 40–60% |40–60%
|} |}
Several economically important traits in meat animals are heritable to some degree (see the table to the right) and can thus be selected for by ]. In cattle, certain growth features are controlled by ] which have not so far been controlled, complicating breeding.<ref name="Lawrie" />{{rp|18}} One such trait is ]; another is the doppelender or "]" condition, which causes ] and thereby increases the animal's commercial value.<ref name="Lawrie" />{{rp|18}} ] continues to reveal the genetic mechanisms that control numerous aspects of the ] and, through it, meat growth and quality.<ref name="Lawrie" />{{rp|19}}


Some economically important traits in meat animals are heritable to some degree, and can thus be selected for by ]. In cattle, certain growth features are controlled by ] which have not so far been controlled, complicating breeding.{{sfn|Lawrie|Ledward|2006|pp=17–22}} One such trait is ]; another is the doppelender or "]" condition, which causes ] and thereby increases the animal's commercial value.{{sfn|Lawrie|Ledward|2006|pp=17–22}} ] continues to reveal the genetic mechanisms that control numerous aspects of the ] and, through it, meat growth and quality.{{sfn|Lawrie|Ledward|2006|pp=17–22}}
] techniques can shorten breeding programmes significantly because they allow for the identification and isolation of ]s coding for desired traits, and for the reincorporation of these genes into the animal ].<ref name="Lawrie" />{{rp|21}} To enable such manipulation, research is ongoing ({{as of|2006|lc=on}}) to ] of sheep, cattle and pigs.<ref name="Lawrie" />{{rp|21}} Some research has already seen commercial application. For instance, a ] ] has been developed which improves the digestion of grass in the ] of cattle, and some specific features of muscle fibres have been genetically altered.<ref name="Lawrie" />{{rp|22}}


] techniques can shorten breeding programs significantly because they allow for the identification and isolation of ]s coding for desired traits, and for the reincorporation of these genes into the animal ].{{sfn|Lawrie|Ledward|2006|pp=17–22}} To enable such manipulation, the genomes of many animals ].{{sfn|Lawrie|Ledward|2006|pp=17–22}} Some research has already seen commercial application. For instance, a ] ] has been developed which improves the digestion of grass in the ] of cattle, and some specific features of muscle fibers have been genetically altered.{{sfn|Lawrie|Ledward|2006|pp=17–22}} Experimental ] of commercially important meat animals such as sheep, pig or cattle has been successful. Multiple asexual reproduction of animals bearing desirable traits is anticipated.{{sfn|Lawrie|Ledward|2006|pp=17–22}}
Experimental ] of commercially important meat animals such as sheep, pig or cattle has been successful. The multiple asexual reproduction of animals bearing desirable traits can thus be anticipated,<ref name="Lawrie" />{{rp|22}} although this is not yet practical on a commercial scale.


=== Environment === === Environment ===
Heat regulation in ] is of great economic significance, because mammals attempt to maintain a constant optimal body temperature. Low temperatures tend to prolong animal development and high temperatures tend to retard it.<ref name="Lawrie" />{{rp|22}} Depending on their size, body shape and insulation through tissue and fur, some animals have a relatively narrow zone of temperature tolerance and others (e.g. cattle) a broad one.<ref name="Lawrie" />{{rp|23}} Static ]s, for reasons still unknown, also retard animal development.<ref name="Lawrie" />{{rp|23}}


Heat regulation in livestock is of economic significance, as mammals attempt to maintain a constant optimal body temperature. Low temperatures tend to prolong animal development and high temperatures tend to delay it. Depending on their size, body shape and insulation through tissue and fur, some animals have a relatively narrow zone of temperature tolerance and others (e.g. cattle) a broad one. Static ]s, for reasons still unknown, retard animal development.{{sfn|Lawrie|Ledward|2006|pp=22–23}}
=== Nutrition ===
The quality and quantity of usable meat depends on the animal's ''plane of nutrition'', i.e., whether it is over- or underfed. Scientists disagree, however, about how exactly the plane of nutrition influences carcase composition.<ref name="Lawrie" />{{rp|25}}


=== Animal nutrition ===
The composition of the diet, especially the amount of protein provided, is also an important factor regulating animal growth.<ref name="Lawrie" />{{rp|26}} ]s, which may digest ], are better adapted to poor-quality diets, but their ruminal microorganisms degrade high-quality protein if supplied in excess.<ref name="Lawrie" />{{rp|27}} Because producing high-quality protein animal feed is expensive (see also '']'' below), several techniques are employed or experimented with to ensure maximum utilization of protein. These include the treatment of feed with ] to protect ]s during their passage through the ], the recycling of ] by feeding it back to cattle mixed with feed concentrates, or the partial conversion of ] ]s to protein through microbial action.<ref name="Lawrie" />{{rp|30}}


The quality and quantity of usable meat depends on the animal's ''plane of nutrition'', i.e., whether it is over- or underfed. Scientists disagree about how exactly the plane of nutrition influences carcase composition.{{sfn|Lawrie|Ledward|2006|pp=25–30}}
In plant feed, environmental factors influence the availability of crucial ]s or ]s, a lack or excess of which can cause a great many ailments.<ref name="Lawrie" />{{rp|29}} In Australia, for instance, where the soil contains limited ], cattle are being fed additional phosphate to increase the efficiency of beef production.<ref name="Lawrie" />{{rp|28}} Also in Australia, cattle and sheep in certain areas were often found losing their appetite and dying in the midst of rich pasture; this was at length found to be a result of ] deficiency in the soil.<ref name="Lawrie" />{{rp|29}} Plant ]s are also a risk to grazing animals; for instance, ], found in some African and Australian plants, kills by disrupting the ].<ref name="Lawrie" />{{rp|29}} Certain man-made ]s such as ] and some ] residues present a particular hazard due to their tendency to ] in meat, potentially poisoning consumers.<ref name="Lawrie" />{{rp|30}}

The composition of the diet, especially the amount of protein provided, is an important factor regulating animal growth. ]s, which may digest ], are better adapted to poor-quality diets, but their ruminal microorganisms degrade high-quality protein if supplied in excess. Because producing high-quality protein animal feed is expensive, several techniques are employed or experimented with to ensure maximum utilization of protein. These include the treatment of feed with ] to protect ]s during their passage through the ], the recycling of ] by feeding it back to cattle mixed with feed concentrates, or the conversion of petroleum ]s to protein through microbial action.{{sfn|Lawrie|Ledward|2006|pp=25–30}}

In plant feed, environmental factors influence the availability of crucial ]s or ]s, a lack or excess of which can cause a great many ailments. In Australia, where the soil contains limited ], cattle are fed additional phosphate to increase the efficiency of beef production. Also in Australia, cattle and sheep in certain areas were often found losing their appetite and dying in the midst of rich pasture; this was found to be a result of ] deficiency in the soil. Plant ]s are a risk to grazing animals; for instance, ], found in some African and Australian plants, kills by disrupting the ]. Some man-made ]s such as ] and some ] residues present a particular hazard as they ] in meat, potentially poisoning consumers.{{sfn|Lawrie|Ledward|2006|pp=25–30}}

=== Animal welfare ===

{{See also|Animal welfare labelling}}

] and other systems is debated.<ref>{{cite web |url=http://www.abc.net.au/news/2014-09-24/rspca-on-free-range-court-case/5769542 |title=RSPCA says egg industry is 'misleading the public' on free range |website=] |access-date=26 May 2015 |date=24 September 2014 |archive-date=1 November 2016 |archive-url=https://web.archive.org/web/20161101051034/http://www.abc.net.au/news/2014-09-24/rspca-on-free-range-court-case/5769542 |url-status=live }}</ref><ref>{{cite web |url=https://www.npr.org/sections/thesalt/2013/06/27/195639341/what-the-rise-of-cage-free-eggs-means-for-chickens |title=What The Rise Of Cage-Free Eggs Means For Chickens |website=] |access-date=26 May 2015 |archive-date=11 February 2021 |archive-url=https://web.archive.org/web/20210211010506/http://www.npr.org/sections/thesalt/2013/06/27/195639341/what-the-rise-of-cage-free-eggs-means-for-chickens |url-status=live }}</ref><ref>{{cite web |url=https://www.npr.org/sections/thesalt/2014/12/23/370377902/farm-fresh-natural-eggs-not-always-what-they-re-cracked-up-to-be |title=Farm Fresh? Natural? Eggs Not Always What They're Cracked Up To Be |website=] |date=23 December 2014 |access-date=26 May 2015 |last1=Kelto |first1=Anders |archive-date=3 November 2020 |archive-url=https://web.archive.org/web/20201103121635/https://www.npr.org/sections/thesalt/2014/12/23/370377902/farm-fresh-natural-eggs-not-always-what-they-re-cracked-up-to-be |url-status=live }}</ref>]]

Practices such as confinement in ] have generated concerns for ]. Animals have ] such as tail-biting, cannibalism, and ]. ] such as ], ], and ] have similarly been questioned.<ref>{{Cite journal |last1=Bartlett |first1=Harriet |last2=Holmes |first2=Mark A. |last3=Petrovan |first3=Silviu O. |last4=Williams |first4=David R. |last5=Wood |first5=James L. N. |last6=Balmford |first6=Andrew |date=June 2022 |title=Understanding the relative risks of zoonosis emergence under contrasting approaches to meeting livestock product demand |journal=] |volume=9 |issue=6 |page=211573 |doi=10.1098/rsos.211573 |pmc=9214290 |pmid=35754996|bibcode=2022RSOS....911573B }}</ref> Breeding for high productivity may affect welfare, as when ] chickens are bred to be very large and to grow rapidly. Broilers often have leg deformities and become lame, and many die from the stress of handling and transport.<ref>{{cite web |url=http://www.ciwf.org.uk/farm_animals/poultry/meat_chickens/welfare_issues.aspx |title=Compassion in World Farming – Meat chickens – Welfare issues |publisher=] |access-date=22 October 2013 |archive-url=https://web.archive.org/web/20131023062150/http://www.ciwf.org.uk/farm_animals/poultry/meat_chickens/welfare_issues.aspx |archive-date=23 October 2013 }}</ref>


=== Human intervention === === Human intervention ===
Meat producers may seek to improve the ] of female animals through the administration of ] or ]-inducing ]s.<ref name="Lawrie" />{{rp|31}} In pig production, ] infertility is a common problem — possibly due to excessive fatness.<ref name="Lawrie" />{{rp|32}} No methods currently exist to augment the fertility of male animals.<ref name="Lawrie" />{{rp|32}} ] is now routinely used to produce animals of the best possible genetic quality, and the efficiency of this method is improved through the administration of hormones that synchronize the ovulation cycles within groups of females.<ref name="Lawrie" />{{rp|33}}


Meat producers may seek to improve the ] of female animals through the administration of ] or ]-inducing ]s. In pig production, ] infertility is a common problem – possibly due to excessive fatness. No methods currently exist to augment the fertility of male animals. ] is now routinely used to produce animals of the best possible genetic quality, and the efficiency of this method is improved through the administration of hormones that synchronize the ovulation cycles within groups of females.{{sfn|Lawrie|Ledward|2006|pp=31–33}}
]s, particularly ] agents such as ]s, are used in some countries to accelerate muscle growth in animals.<ref name="Lawrie" />{{rp|33}} This practice has given rise to the ], an international trade dispute. It may also decrease the tenderness of meat, although research on this is inconclusive,<ref name="Lawrie" />{{rp|35}} and have other effects on the composition of the muscle flesh.<ref name="Lawrie" />{{rp|36ff}} Where ] is used to improve control over male animals, its side effects are also counteracted by the administration of hormones.<ref name="Lawrie" />{{rp|33}}


]s, particularly ] agents such as ]s, are used in some countries to accelerate muscle growth in animals.{{sfn|Lawrie|Ledward|2006|pp=31–33}} This practice has given rise to the ], an international trade dispute. It may decrease the tenderness of meat, although research on this is inconclusive, and have other effects on the composition of the muscle flesh.{{sfn|Lawrie|Ledward|2006|pp=35–39}} Where ] is used to improve control over male animals, its side effects can be counteracted by the administration of hormones.{{sfn|Lawrie|Ledward|2006|pp=31–33}} ] has been used to produce ].<ref>{{cite journal |last1=Aiello |first1=D. |last2=Patel |first2=K. |last3=Lasagna |first3=E. |title=The myostatin gene: an overview of mechanisms of action and its relevance to livestock animals |journal=Animal Genetics |date=December 2018 |volume=49 |issue=6 |pages=505–519 |doi=10.1111/age.12696 |pmid=30125951 |s2cid=52051853 |url=https://centaur.reading.ac.uk/77388/1/Aiello_et_al_revised_not_highlighted.pdf }}</ref>
]s may be administered to animals to counteract stress factors and increase weight gain.<ref name="Lawrie" />{{rp|39}} The feeding of ]s to certain animals has been shown to improve growth rates also.<ref name="Lawrie" />{{rp|39}} This practice is particularly prevalent in the USA, but has been banned in the ], partly because it causes ] in ]ic microorganisms.<ref name="Lawrie" />{{rp|39}}


]s may be administered to animals to counteract stress factors and increase weight gain. The feeding of ] to certain animals increases growth rates. This practice is particularly prevalent in the US, but has been banned in the EU, partly because it causes ] in ]ic microorganisms.{{sfn|Lawrie|Ledward|2006|pp=35–39}}
== Biochemical composition ==
Numerous aspects of the biochemical composition of meat vary in complex ways depending on the species, breed, sex, age, plane of nutrition, training and exercise of the animal, as well as on the anatomical location of the musculature involved.<ref name="Lawrie" />{{rp|94–126}} Even between animals of the same litter and sex there are considerable differences in such parameters as the percentage of intramuscular fat.<ref name="Lawrie" />{{rp|126}}


== Composition ==
=== Main constituents ===
Adult mammalian ] flesh consists of roughly 75 percent water, 19 percent protein, 2.5 percent intramuscular fat, 1.2 percent ]s and 2.3 percent other soluble non-protein substances. These include ] compounds, such as ]s, and inorganic substances such as minerals.<ref name="Lawrie" />{{rp|76}}


=== Biochemical ===
Muscle proteins are either soluble in water (]ic proteins, about 11.5 percent of total muscle mass) or in concentrated salt solutions (] proteins, about 5.5 percent of mass).<ref name="Lawrie" />{{rp|75}} There are several hundred sarcoplasmic proteins.<ref name="Lawrie" />{{rp|77}} Most of them – the glycolytic ]s – are involved in the ], i.e., the conversion of stored energy into muscle power.<ref name="Lawrie" />{{rp|78}} The two most abundant myofibrillar proteins, ] and ],<ref name="Lawrie" />{{rp|79}} are responsible for the muscle's overall structure. The remaining protein mass consists of ] (] and ]) as well as ] tissue.<ref name="Lawrie" />{{rp|79}}


The biochemical composition of meat varies in complex ways depending on the species, breed, sex, age, plane of nutrition, training and exercise of the animal, as well as on the anatomical location of the musculature involved.{{sfn|Lawrie|Ledward|2006|p=94–126}} Even between animals of the same litter and sex there are considerable differences in such parameters as the percentage of intramuscular fat.{{sfn|Lawrie|Ledward|2006|p=126}}
Fat in meat can be either ], used by the animal to store energy and consisting of "true fats" (]s of ] with ]s),<ref name="Lawrie" />{{rp|82}} or intramuscular fat, which contains considerable quantities of ]s and of ] constituents such as ].<ref name="Lawrie" />{{rp|82}}


Adult mammalian ] consists of roughly 75 percent water, 19 percent protein, 2.5 percent intramuscular fat, 1.2 percent ]s and 2.3 percent other soluble substances. These include organic compounds, especially ]s, and inorganic substances such as minerals.{{sfn|Lawrie|Ledward|2006|pp=76–80}} Muscle proteins are either soluble in water (]ic proteins, about 11.5 percent of total muscle mass) or in concentrated salt solutions (]lar proteins, about 5.5 percent of mass).{{sfn|Lawrie|Ledward|2006|pp=76–80}} There are several hundred sarcoplasmic proteins.{{sfn|Lawrie|Ledward|2006|pp=76–80}} Most of them – the glycolytic ]s – are involved in ], the conversion of sugars into high-energy molecules, especially ] (ATP).{{sfn|Lawrie|Ledward|2006|pp=76–80}} The two most abundant myofibrillar proteins, ] and ],{{sfn|Lawrie|Ledward|2006|pp=76–80}} form the muscle's overall structure and enable it to deliver power, consuming ATP in the process. The remaining protein mass includes ] (] and ]).{{sfn|Lawrie|Ledward|2006|pp=76–80}} Fat in meat can be either ], used by the animal to store energy and consisting of "true fats" (]s of ] with ]s),{{sfn|Lawrie|Ledward|2006|p=82}} or intramuscular fat, which contains ]s and ].{{sfn|Lawrie|Ledward|2006|p=82}}
=== Red and white meat ===
]
Meat can be broadly classified as "red" or "white" depending on the concentration of ] in muscle fibre. When myoglobin is exposed to ], reddish oxymyoglobin develops, making myoglobin-rich meat appear red. The redness of meat depends on species, animal age, and fibre type: ] contains more narrow muscle fibres that tend to operate over long periods without rest,<ref name="Lawrie" />{{rp|93}} while ] contains more broad fibres that tend to work in short fast bursts.<ref name="Lawrie" />{{rp|93}}


Meat can be broadly classified as "red" or "white" depending on the concentration of ] in muscle fiber. When myoglobin is exposed to ], reddish oxymyoglobin develops, making myoglobin-rich meat appear red. The redness of meat depends on species, animal age, and fiber type: ] contains more narrow muscle fibers that tend to operate over long periods without rest,{{sfn|Lawrie|Ledward|2006|p=93}} while ] contains more broad fibers that tend to work in short fast bursts, such as the brief flight of the chicken.{{sfn|Lawrie|Ledward|2006|p=93}} The meat of adult mammals such as ], ], and ] is considered red, while ] and ] breast meat is considered white.<ref>{{cite news |url=http://www.fitday.com/fitness-articles/nutrition/healthy-eating/white-meat-vs-red-meat.html |title=White Meat vs. Red Meat / Nutrition / Healthy Eating |access-date=April 25, 2017 |archive-url=https://web.archive.org/web/20170505011359/http://www.fitday.com/fitness-articles/nutrition/healthy-eating/white-meat-vs-red-meat.html |archive-date=May 5, 2017 |url-status=live}}</ref>
Generally, the meat of adult mammals such as ], ], ], and ] is considered red, while ] and ] breast meat is considered white.{{citation needed|date=May 2013}}


<gallery class=center mode=nolines widths=275 heights=140>
== Nutritional information ==
File:Blade steak (cropped).jpg|"Red" meat:<br/>beef steak
{| class="wikitable" style="float:right; margin-left:1em;"
File:Hühnerbrustfilet 20090502 001 (cropped).JPG|"White" meat:<br/>chicken breast (flight muscle)
|+'''Typical nutritional content of <br />110&nbsp;grams (4&nbsp;oz or .25&nbsp;lb) of meat'''
</gallery>

=== Nutritional ===

] tissue is high in protein, containing all of the ]s, and in most cases is a good source of ], ], ], ], ], ], ], ] and iron.<ref name="beef.org">{{cite web |url=http://www.beef.org/uDocs/whatyoumisswithoutmeat638.pdf |title=Don't Miss Out on the Benefits of Naturally Nutrient-Rich Lean Beef |access-date=January 11, 2008 |url-status=dead |archive-url=https://web.archive.org/web/20080227150725/http://www.beef.org/uDocs/whatyoumisswithoutmeat638.pdf |archive-date=February 27, 2008 }}</ref> Several forms of meat are high in ].<ref name="k2 foods">{{cite journal |last1=Schurgers |first1=L.J. |last2=Vermeer |first2=C. |title=Determination of phylloquinone and menaquinones in food. Effect of food matrix on circulating vitamin K concentrations |journal=Haemostasis |volume=30 |issue=6 |pages=298–307 |year=2000 |pmid=11356998 |doi=10.1159/000054147 |s2cid=84592720 }}</ref> Muscle tissue is very low in carbohydrates and does not contain dietary fiber.<ref>{{cite web |url=http://www.ext.colostate.edu/pubs/foodnut/09333.html |title=Dietary Fiber |publisher=Ext.colostate.edu |access-date=May 1, 2010 |archive-url=https://web.archive.org/web/20130628045019/http://www.ext.colostate.edu/pubs/FOODNUT/09333.html |archive-date=June 28, 2013 |url-status=live }}</ref>

The fat content of meat varies widely with the ] and ] of animal, the way in which the animal was raised, what it was fed, the part of the body, and the methods of butchering and cooking. Wild animals such as ] are leaner than farm animals, leading those concerned about fat content to choose ] such as ]. Decades of breeding meat animals for fatness is being reversed by consumer demand for leaner meat. The fatty deposits near the muscle fibers in meats soften meat when it is cooked, improve its flavor, and make the meat seem juicier. Fat around meat further contains ]. The increase in meat consumption after 1960 is associated with significant imbalances of fat and cholesterol in the human diet.<ref>{{cite book |last=Horowitz |first=Roger |title=Putting Meat on the American Table: Taste, Technology, Transformation |publisher=The Johns Hopkins University Press |year=2005 |page=4}}</ref>

{|class="wikitable" style="margin: 1em auto;"
|+ Nutritional content of {{convert|110|g|lb|abbr=on|frac=4}}; data vary widely with selection (e.g. skinless, boneless) and preparation
|- |-
! Source
! style="background:#aaf; text-align:center;"| '''Source'''
! ]: kJ (kcal)
! style="background:#ddf; text-align:center;"| ''']s'''
! ]
! style="background:#ddf; text-align:center;"| ''']'''
! style="background:#ddf; text-align:center;"| ''']''' ! ]
! Fat
! style="background:#ddf; text-align:center;"| ''']'''
|- |-
! Chicken breast<ref>{{cite web |title=Chicken, breast, boneless, skinless, raw |url=https://fdc.nal.usda.gov/fdc-app.html#/food-details/2646170/nutrients |website=FoodData Central, USDA |access-date=17 February 2024}}</ref>
! style="background:#ccf; text-align:left;"| fish.
|{{convert|117|kcal|kJ|order=flip|abbr=values}}<!--scaled up from 100g to 110g-->
| style="background:#fff; text-align:center;"| 110–140
|25&nbsp;g
| style="background:#fff; text-align:center;"| 20–25&nbsp;g
|0&nbsp;g
| style="background:#fff; text-align:center;"| 0&nbsp;g
|2&nbsp;g
| style="background:#fff; text-align:center;"| 1–5&nbsp;g
|- |-
! Lamb mince<ref>{{cite web |title=Lamb, New Zealand, imported, ground lamb, raw |url=https://fdc.nal.usda.gov/fdc-app.html#/food-details/172617/nutrients |website=FoodData Central, USDA |access-date=17 February 2024}}</ref>
! style="background:#ccf; text-align:left;"| chicken breast
|{{convert|319|kcal|kJ|order=flip|abbr=values}}
| style="background:#fff; text-align:center;"| 160
|19&nbsp;g
| style="background:#fff; text-align:center;"| 28&nbsp;g
|0&nbsp;g
| style="background:#fff; text-align:center;"| 0&nbsp;g
|26&nbsp;g
| style="background:#fff; text-align:center;"| 7&nbsp;g
|- |-
! Beef mince<ref>{{cite web |title=Beef, ground, 80% lean meat / 20% fat, raw |url=https://fdc.nal.usda.gov/fdc-app.html#/food-details/174036/nutrients |website=FoodData Central, USDA |access-date=17 February 2024}}</ref>
! style="background:#ccf; text-align:left;"| lamb
|{{convert|287|kcal|kJ|order=flip|abbr=values}}<!--scaled up from 100g to 110g-->
| style="background:#fff; text-align:center;"| 250
|19&nbsp;g
| style="background:#fff; text-align:center;"| 30&nbsp;g
|0&nbsp;g
| style="background:#fff; text-align:center;"| 0&nbsp;g
|22&nbsp;g
| style="background:#fff; text-align:center;"| 14&nbsp;g
|- |-
! Dog<ref>Ann Yong-Geun {{Webarchive|url=http://archive.wikiwix.com/cache/20071007160723/http://wolf.ok.ac.kr/~annyg/report/r2.htm|date=October 7, 2007}}, Table 4. Composition of dog meat and Bosintang (in 100g, raw meat), ''Korean Journal of Food and Nutrition'' 12(4) 397 – 408 (1999).</ref>
! style="background:#ccf; text-align:left;"| steak (beef top round)
|{{convert|270|kcal|kJ|order=flip|abbr=values}}
| style="background:#fff; text-align:center;"| 210
|20&nbsp;g
| style="background:#fff; text-align:center;"| 36&nbsp;g
|0&nbsp;g
| style="background:#fff; text-align:center;"| 0&nbsp;g
|22&nbsp;g
| style="background:#fff; text-align:center;"| 7&nbsp;g
|- |-
! Horse<ref>{{cite web |title=Game meat, horse, raw |url=https://fdc.nal.usda.gov/fdc-app.html#/food-details/175086/nutrients |website=FoodData Central, USDA |access-date=17 February 2024}}</ref>
! style="background:#ccf; text-align:left;"| steak (beef T-bone)
|{{convert|146|kcal|kJ|order=flip|abbr=values}}<!--scaled up from 100g to 110g-->
| style="background:#fff; text-align:center;"| 450
|23&nbsp;g
| style="background:#fff; text-align:center;"| 25&nbsp;g
|0&nbsp;g
| style="background:#fff; text-align:center;"| 0&nbsp;g
|5&nbsp;g
| style="background:#fff; text-align:center;"| 35&nbsp;g
|-
! Pork loin<ref>{{Cite web |url=https://fdc.nal.usda.gov/index.html |title=FoodData Central |website=fdc.nal.usda.gov |access-date=October 25, 2019 |archive-url=https://web.archive.org/web/20191203185131/https://fdc.nal.usda.gov/index.html|archive-date=December 3, 2019 |url-status=live}}</ref>
|{{convert|242|kcal|kJ|order=flip|abbr=values}}
|14&nbsp;g
|0&nbsp;g
|30&nbsp;g
|-
! Rabbit<ref>{{Cite web |url=https://fdc.nal.usda.gov/fdc-app.html#/food-details/337051/nutrients |title=FoodData Central |website=fdc.nal.usda.gov |access-date=October 26, 2019 |archive-url=https://web.archive.org/web/20191025172925/https://fdc.nal.usda.gov/fdc-app.html#/food-details/337051/nutrients |archive-date=October 25, 2019 |url-status=live}}</ref>
|{{convert|215|kcal|kJ|order=flip|abbr=values}}
|32&nbsp;g
|0&nbsp;g
|9&nbsp;g
|} |}
All ] tissue is very high in protein, containing all of the ]s, and in most cases is a good source of ], ], ], ], ], ], ], ] and ].<ref name="beef.org">http://www.beef.org/uDocs/whatyoumisswithoutmeat638.pdf</ref> Several forms of meat are also high in ].<ref name="k2 foods">{{cite journal
| last1 = Schurgers | first1 = L. J.
| last2 = Vermeer | first2 = C.
| title = Determination of phylloquinone and menaquinones in food. Effect of food matrix on circulating vitamin K concentrations
| journal = Haemostasis
| volume = 30
| issue = 6
| pages = 298–307
| year = 2000
| pmid = 11356998
| doi=10.1159/000054147
}}</ref> Muscle tissue is very low in carbohydrates and does not contain dietary fiber.<ref>{{cite web|url=http://www.ext.colostate.edu/pubs/foodnut/09333.html |title=Dietary Fiber |publisher=Ext.colostate.edu |accessdate=May 1, 2010}}</ref> While taste quality may vary between meats, the proteins, vitamins, and minerals available from meats are generally consistent.


== Production ==
The fat content of meat can vary widely depending on the ] and ] of animal, the way in which the animal was raised, including what it was fed, the ] part of the body, and the methods of butchering and cooking. Wild animals such as ] are typically leaner than farm animals, leading those concerned about fat content to choose ] such as ]. Decades of breeding meat animals for fatness is being reversed by consumer demand for meat with less fat. The fatty deposits that exist with the muscle fibers in meats soften meat when it is cooked and improve the flavor through chemical changes initiated through heat that allow the protein and fat molecules to interact. The fat, when cooked with meat, also makes the meat seem juicier. However, the nutritional contribution of the fat is mainly calories as opposed to protein. As fat content rises, the meat's contribution to nutrition declines. In addition, there is ] associated with fat surrounding the meat. The cholesterol is a lipid associated with the kind of saturated fat found in meat. The increase in meat consumption after 1960 is associated with, though not definitively the cause of, significant imbalances of fat and cholesterol in the human diet.<ref>Horowitz, Roger. "Putting Meat on the American Table: Taste, Technology, Transformation" The Johns Hopkins University Press, 2005 p. 4.</ref>


{{further|Meat industry|Meat-packing industry}}
The table in this section compares the nutritional content of several types of meat. While each kind of meat has about the same content of protein and carbohydrates, there is a very wide range of fat content.


<gallery class=center mode=packed heights=300>
== Production ==
File:World production of meat, main items.svg|World production of meat, main items<ref name="FAOSTAT 2021">{{Cite book|url=https://doi.org/10.4060/cb4477en |title=World Food and Agriculture – Statistical Yearbook 2021 |publisher=FAO |year=2021 |isbn=978-92-5-134332-6 |location=Rome |doi=10.4060/cb4477en |s2cid=240163091}}</ref>
{{Main article|Meat industry|Meat packing industry|Animal slaughter|Slaughterhouse|Butchery}}
File:World production of main meat items, main producers (2019).svg|World production of main meat items, main producers (2019)<ref name="FAOSTAT 2021"/>
{{See also|Fishing industry}}
</gallery>
Meat is produced by killing an animal and cutting flesh out of it. These procedures are called ] and ], respectively. There is ongoing research into producing ], that is, outside of animals.

{{Bar chart|title=Land Animals Killed for Meat, 2013<ref>{{Cite web |url=http://www.fao.org/faostat/en/#data/QL |title=FAOSTAT |publisher=Food and Agriculture Organization |access-date=October 25, 2019 |archive-url=https://web.archive.org/web/20170511194947/http://www.fao.org/faostat/en/#data/QL |archive-date=May 11, 2017 |url-status=live}}</ref>|float=right
|label_type=Animals|data_type=Number Killed|bar_width=10<!--horizontal bar chart-->|width_units=em|data_max=61171973510
|label1=Chickens|data1=61171973510
|label2=Ducks|data2=2887594480
|label3=Pigs|data3=1451856889
|label4=Rabbits|data4=1171578000
|label5=Geese|data5=687147000
|label6=Turkeys|data6=618086890
|label7=Sheep|data7=536742256
|label8=Goats|data8=438320370
|label9=Cattle|data9=298799160
|label10=Rodents|data10=70371000
|label11=Other birds|data11=59656000
|label12=Buffalo|data12=25798819
|label13=Horses|data13=4863367
|label14=Donkeys, mules|data14=3478300
|label15=Camelids|data15=3298266}}

{{Pie chart
|caption='''] of ]s on Earth'''<ref>{{Cite web|date=May 21, 2018|title=Humans just 0.01% of all life but have destroyed 83% of wild mammals – study|url=http://www.theguardian.com/environment/2018/may/21/human-race-just-001-of-all-life-but-has-destroyed-over-80-of-wild-mammals-study|access-date=December 30, 2022|website=The Guardian}}</ref>
|label1 =Livestock, mostly cattle and pigs
|value1 =60 |color1=blue
|label2 =Humans
|value2 =36 |color2=red
|label3 =]
|value3 =4 |color3=green
}}


=== Transport === === Transport ===

Upon reaching a predetermined age or weight, livestock are usually transported ''en masse'' to the slaughterhouse. Depending on its length and circumstances, this may exert stress and injuries on the animals, and some may die ''en route''.<ref name="Lawrie" />{{rp|129}} Unnecessary stress in transport may adversely affect the quality of the meat.<ref name="Lawrie" />{{rp|129}} In particular, the muscles of stressed animals are low in water and ], and their ] fails to attain acidic values, all of which results in poor meat quality.<ref name="Lawrie" />{{rp|130}} Consequently, and also due to campaigning by ] groups, laws and industry practices in several countries tend to become more restrictive with respect to the duration and other circumstances of livestock transports.
Upon reaching a predetermined age or weight, livestock are usually transported ''en masse'' to the slaughterhouse.{{sfn|Lawrie|Ledward|2006|pp=129–130}} Depending on its length and circumstances, this may exert stress and injuries on the animals, and some may die ''en route''.{{sfn|Lawrie|Ledward|2006|pp=129–130}} Unnecessary stress in transport may adversely affect the quality of the meat.{{sfn|Lawrie|Ledward|2006|pp=129–130}} In particular, the muscles of stressed animals are low in water and ], and their ] fails to attain acidic values, all of which results in poor meat quality.{{sfn|Lawrie|Ledward|2006|pp=129–130}}


=== Slaughter === === Slaughter ===


{{see also|Animal slaughter|Meat industry}}
Animals are usually slaughtered by being first ] and then ] (bled out). Death results from the one or the other procedure, depending on the methods employed. Stunning can be effected through ]ting the animals with ], shooting them with a ] or a ], or shocking them with electric current.<ref name="Lawrie" />{{rp|134ff}} In most forms of ], stunning is not allowed.


Draining as much blood as possible from the carcass is necessary because blood causes the meat to have an unappealing appearance and is a breeding ground for microorganisms.<ref name="Lawrie" />{{rp|1340}} The exsanguination is accomplished by severing the ] and the ] in cattle and sheep, and the ] in pigs.<ref name="Lawrie" />{{rp|137}} Animals are usually slaughtered by being first ] and then ] (bled out). Death results from the one or the other procedure, depending on the methods employed.{{sfn|Lawrie|Ledward|2006|pp=134–138}} Stunning can be effected through ]ting the animals with ], shooting them with a gun or a ], or shocking them with electric current.{{sfn|Lawrie|Ledward|2006|pp=134–138}} The exsanguination is accomplished by severing the ] and the ] in cattle and sheep, and the ] in pigs.{{sfn|Lawrie|Ledward|2006|pp=134–138}} Draining as much blood as possible from the carcass is necessary because blood causes the meat to have an unappealing appearance and is a breeding ground for microorganisms.{{sfn|Lawrie|Ledward|2006|pp=134–138}}


=== Dressing and cutting === === Dressing and cutting ===

After exsanguination, the carcass is dressed; that is, the head, feet, hide (except hogs and some veal), excess fat, ] and ] are removed, leaving only bones and edible muscle.<ref name="Lawrie" />{{rp|138}} Cattle and pig carcases, but not those
of sheep, are then split in half along the mid ventral axis, and the carcase is cut into wholesale pieces.<ref name="Lawrie" />{{rp|138}} The dressing and cutting sequence, long a province of manual labor, is progressively being fully automated.<ref name="Lawrie" />{{rp|138}} After exsanguination, the carcass is dressed; that is, the head, feet, hide (except hogs and some veal), excess fat, ] and ] are removed, leaving only bones and edible muscle.{{sfn|Lawrie|Ledward|2006|pp=134–138}} Cattle and pig carcases, but not those of sheep, are then split in half along the mid ventral axis, and the carcase is cut into wholesale pieces. The dressing and cutting sequence, long a province of manual labor, is being progressively automated.{{sfn|Lawrie|Ledward|2006|pp=134–138}}


=== Conditioning === === Conditioning ===
], France.]]
Under hygienic conditions and without other treatment, meat can be stored at above its freezing point (–1.5&nbsp;°C) for about six weeks without spoilage, during which time it undergoes an aging process that increases its tenderness and flavor.<ref name="Lawrie" />{{rp|141}}


During the first day after death, ] continues until the accumulation of ] causes the ] to reach about 5.5. The remaining ], about 18&nbsp;g per kg, is believed to increase the water-holding capacity and tenderness of the flesh when cooked.<ref name="Lawrie" />{{rp|87}} '']'' sets in a few hours after death as ] is used up, causing ] and ] to combine into rigid ] and lowering the meat's water-holding capacity,<ref name="Lawrie" />{{rp|90}} causing it to lose water ("weep").<ref name="Lawrie" />{{rp|146}} In muscles that enter ''rigor'' in a contracted position, actin and myosin filaments overlap and cross-bond, resulting in meat that is tough on cooking<ref name="Lawrie" />{{rp|144}} – hence again the need to prevent pre-slaughter stress in the animal. Under hygienic conditions and without other treatment, meat can be stored at above its freezing point (−1.5&nbsp;°C) for about six weeks without spoilage, during which time it undergoes an aging process that increases its tenderness and flavor.{{sfn|Lawrie|Ledward|2006|pp=141–146}} During the first day after death, ] continues until the accumulation of ] causes the ] to reach about 5.5. The remaining ], about 18&nbsp;g per kg, increases the water-holding capacity and tenderness of cooked meat.{{sfn|Lawrie|Ledward|2006|p=87}}


'']'' sets in a few hours after death as ] is used up. This causes the muscle proteins ] and ] to combine into rigid ]. This in turn lowers the meat's water-holding capacity,{{sfn|Lawrie|Ledward|2006|p=90}} so the meat loses water or "weeps".{{sfn|Lawrie|Ledward|2006|pp=141–146}} In muscles that enter ''rigor'' in a contracted position, actin and myosin filaments overlap and cross-bond, resulting in meat that becomes tough when cooked.{{sfn|Lawrie|Ledward|2006|pp=141–146}} Over time, muscle proteins ] in varying degree, with the exception of the collagen and ] of ],{{sfn|Lawrie|Ledward|2006|pp=141–146}} and ''rigor mortis'' resolves. These changes mean that meat is tender and pliable when cooked just after death or after the resolution of ''rigor'', but tough when cooked during ''rigor.''{{sfn|Lawrie|Ledward|2006|pp=141–146}}
Over time, the muscle proteins ] in varying degree, with the exception of the collagen and ] of ],<ref name="Lawrie" />{{rp|142}} and ''rigor mortis'' resolves. Because of these changes, the meat is tender and pliable when cooked just after death or after the resolution of ''rigor'', but tough when cooked during ''rigor.''<ref name="Lawrie" />{{rp|142}} As the muscle pigment ] denatures, its iron ], which may cause a brown discoloration near the surface of the meat.<ref name="Lawrie" />{{rp|146}} Ongoing ] also contributes to conditioning. ], a breakdown product of ATP, contributes to the meat's flavor and odor, as do other products of the decomposition of muscle fat and protein.<ref name="Lawrie" />{{rp|155}}


As the muscle pigment ] denatures, its iron ], which may cause a brown discoloration near the surface of the meat.{{sfn|Lawrie|Ledward|2006|pp=141–146}} Ongoing ] contributes to conditioning: ], a breakdown product of ATP, contributes to meat's flavor and odor, as do other products of the decomposition of muscle fat and protein.{{sfn|Lawrie|Ledward|2006|p=155}}
=== Contaminants ===

Meat and meat products are likely to contain substances such as dioxins, polychlorinated biphenyl (PCBs), and cooked meat carcinogens, that are toxic to the consumer, although any chemical's toxicity is dependent on the dose and timing of exposure. Toxins may be introduced to meat as part of animal feed, as veterinary drug residues, or during processing and cooking.<ref name="Püssa"/>
<gallery class=center mode=nolines widths=220 heights=220>
File:Atria slaughterhouse in Nurmo Seinajoki.JPG|A ], Finland
File:MIN Rungis viandes de boucherie veau.jpg|], France
File:Sucuk-1.jpg|The word "]" is derived from ] {{Lang|fro|saussiche}}, from ] {{Lang|la|salsus}}, "salted".<ref>{{cite web |url=http://www.etymonline.com/index.php?search=sausage&searchmode=none |title=Sausage |publisher=] |date=October 16, 1920 |access-date=January 31, 2012 |archive-url=https://web.archive.org/web/20121021020552/http://www.etymonline.com/index.php?search=sausage&searchmode=none |archive-date=October 21, 2012 |url-status=live }}</ref>
</gallery>


=== Additives === === Additives ===
] ''saussiche'', from the ] word ''salsus'' meaning "salted".<ref>{{cite web|url=http://www.etymonline.com/index.php?search=sausage&searchmode=none |title=Online Etymology Dictionary |publisher=Etymonline.com |date=16 October 1920 |accessdate=31 January 2012}}</ref>]]


{{further|Meat spoilage|Meat preservation}}
When meat is industrially processed in preparation of consumption, it may be enriched with ] to protect or modify its flavor or color, to improve its tenderness, juiciness or cohesiveness, or to aid with its ]. Meat additives include the following:<ref name="Mills, Additives">{{cite book|last=Mills|first=E.|title=Encyclopedia of meat sciences|chapter=Additives|year=2004|publisher=]|location=Oxford|isbn=978-0-12-464970-5|pages=1–6|edition=1st}}</ref>
*] is the most frequently used additive in meat processing. It imparts flavor but also inhibits microbial growth, extends the product's shelf life and helps ] finely processed products, such as sausages. Ready-to-eat meat products normally contain about 1.5 to 2.5 percent salt.<ref name="Mills, Additives" /> Salt water or similar substances may also be injected into ] meat to improve the taste and increase the weight, in a process called ].
*] is used in ] to stabilize the meat's color and flavor, and inhibits the growth of spore-forming microorganisms such as '']''. The use of nitrite's precursor ] is now limited to a few products such as dry sausage, ] or ].<ref name="Mills, Additives" />
*]s used in meat processing are normally alkaline ]s such as ]. They are used to increase the water-binding and emulsifying ability of meat proteins, but also limit lipid oxidation and flavor loss, and reduce microbial growth.<ref name="Mills, Additives" />
*] or its equivalent ] (vitamin C) is used to stabilize the color of cured meat.<ref name="Mills, Additives" />
*] such as ] or ] impart a sweet flavor, bind water and assist surface browning during cooking in the ].<ref name="Mills, Additives" />
*]s impart or modify flavor. They include ]s or ]s extracted from them, ]s, vegetables and ]s.<ref name="Mills, Additives" />
*]s such as ] impart or strengthen a particular flavor.<ref name="Mills, Additives" />
*] break down ]s to make the meat more palatable for consumption. They include ]s, acids, salt and phosphate.<ref name="Mills, Additives" />
*Dedicated ]s include ], ] and ], ], acidified ] or ], ], activated ], ] or ], or ]s such as ].<ref name="Mills, Additives" />
*]s include a wide range of chemicals that limit ], which creates an undesirable "off flavor", in precooked meat products.<ref name="Mills, Additives" />
*]s, most often lactic or citric acid, can impart a tangy or tart flavor note, extend shelf-life, tenderize fresh meat or help with protein ] and moisture release in dried meat. They substitute for the process of natural fermentation that acidifies some meat products such as hard ] or prosciutto.<ref name="Mills, Additives" />


When meat is industrially processed, ] are used to protect or modify its flavor or color, to improve its tenderness, juiciness or cohesiveness, or to aid with its ].<ref name="Mills, Additives">{{cite book |last=Mills |first=E. |title=Encyclopedia of Meat Sciences |chapter=Additives |year=2004 |publisher=] |location=Oxford |isbn=978-0-12-464970-5 |pages=1–6 |edition=1st}}</ref>
=== Misidentification ===
With the rise of complex ], including ]s, in developed economies, the distance between the farmer or fisherman and customer has grown, increasing the possibility for intentional and unintentional misidentification of meat at various points in the supply chain.<ref name=WPFish />


{|class="wikitable"
In 2013, reports emerged across Europe that products labelled as containing beef ].<ref> New York Times, Retrieved April 17, 2013</ref> In February 2013 a study was published showing that about one-third of raw fish are misidentified across the United States.<ref name=WPFish>Juliet Eilperin and Tim Carman for the Washington Post. February 21, 2013. </ref>
|+ Additives used in industrial meat processing<ref name="Mills, Additives"/>
|-
! Additive !! Examples !! Function !! Notes
|-
|] ||n/a ||Imparts flavor, inhibits microbial growth, extends the product's shelf life and helps ] finely processed products, such as sausages. ||The most common additive. Ready-to-eat meat products often contain 1.5 to 2.5 percent salt.
|-
|] ||n/a ||], to stabilize color and flavor, and inhibit growth of spore-forming microorganisms such as '']''. ||The use of nitrite's precursor ] is now limited to a few products such as dry sausage, ] or ].
|-
|Alkaline ]s ||] ||Increase the water-binding and emulsifying ability of meat proteins, limit lipid oxidation and flavor loss, and reduce microbial growth. ||
|-
|] (vitamin C) ||n/a ||Stabilize the color of cured meat. ||
|-
|] ||Sugar, ] ||Impart a sweet flavor, bind water and assist surface browning during cooking in the ]. ||
|-
|]s ||Spices, herbs, essential oils ||Impart or modify flavor. ||
|-
|]s ||] ||Strengthen existing flavors. ||
|-
|] ||]s, acids ||Break down ] to make the meat more palatable for consumption. ||
|-
|]s ||], ] and ], ], ], ], ]s such as ]. ||Limit growth of ] bacteria ||
|-
|]s || ||Limit ], which would create an undesirable "off flavor". ||Used in precooked meat products.
|-
|]s ||Lactic acid, citric acid ||Impart a tangy or tart flavor note, extend shelf-life, tenderize fresh meat or help with protein ] and moisture release in dried meat. ||They substitute for the process of natural fermentation that acidifies some meat products such as hard ] or ].
|}


=== Imitation meat === == Consumption ==
Various forms of ] have been created for people who wish not to eat meat but still want to taste its flavor and texture. Meat imitates are typically some form of processed ] (], ]), but they can also be based on ] or even fungi (]).


=== Environmental impact === === Historical ===
{{Main article|Environmental impact of meat production}}


A ] (specifically, ]) study of ] found, based on the funerary record, that high-meat protein diets were extremely rare, and that (contrary to previously held assumptions) elites did not consume more meat than non-elites, and men did not consume more meat than women.<ref>{{Cite journal |last1=Leggett |first1=Sam |last2=Lambert |first2=Tom |date=2022 |title=Food and Power in Early Medieval England: a Lack of (Isotopic) Enrichment |journal=Anglo-Saxon England |volume=49 |pages=155–196 |doi=10.1017/S0263675122000072 |s2cid=257354036 |doi-access=free|hdl=20.500.11820/220ece77-d37d-4be5-be19-6edc333cb58e |hdl-access=free }}</ref>
Various environmental effects are associated with meat production. Among these are greenhouse gas emissions, fossil energy use, water use, water quality changes, and effects on grazed ecosystems.


In the nineteenth century, meat consumption in Britain was the highest in Europe, exceeded only by that in British colonies. In the 1830s consumption per head in Britain was about {{convert|75|lb|kg|order=flip}} a year, rising to {{convert|130|lb|kg|order=flip}} in 1912. In 1904, laborers consumed {{convert|87|lb|kg|order=flip}} a year while aristocrats ate {{convert|300|lb|kg|order=flip}}. There were some 43,000 butcher's shops in Britain in 1910, with "possibly more money invested in the meat industry than in any other British business" except finance.<ref name="Otter 2020">{{cite book |last1=Otter |first1=Chris |title=Diet for a large planet |date=2020 |publisher=] |location=USA |isbn=978-0-226-69710-9 |pages=28, 35, 47}}</ref> The US was a meat importing country by 1926.<ref name="Otter 2020"/>
The livestock sector may be the largest source of water pollution (due to animal wastes, fertilizers, pesticides), and it contributes to emergence of antibiotic resistance. It accounts for over 8% of global human water use. It is by far the biggest cause of land use, as it accounts for 30% of the global land surface. It is probably the leading player in biodiversity loss, as it causes deforestation, land degradation, pollution, and overfishing.<ref>August 2009. "Livestock's Long Shadow – Environmental issues and options". Fao.org. Retrieved from ftp://ftp.fao.org/docrep/fao/010/a0701e/a0701e.pdf</ref> It is reportedly responsible for 14.5% of the world's anthropogenic greenhouse gas emissions.<ref>Gerber, P. J., H. Steinfeld, B. Henderson, A. Mottet, C. Opio, J. Dijkman, A. Falcucci and G. Tempio. 2013. Tackling climate change through livestock – a global assessmaent of emissions and mitigation opportunities. Food and Agriculture Organization of the United Nations, Rome. 115 pp.</ref> Although, a revised study of the environmental impact of livestock states that they account for 51% of worldwide greenhouse gas emissions.<ref>Goodland & Anhang (2009). Livestock and Climate Change: What if the key actors in climate change are cows, pigs and chickens? p.11 Retrieved from: http://www.worldwatch.org/files/pdf/Livestock%20and%20Climate%20Change.pdf</ref> However, it is not only meat production that causes environmental damage, because according to production data compiled by the FAO, 74 percent of global livestock product tonnage in 2011 was accounted for by non-meat products.<ref>FAOSTAT. Food and Agriculture Organization of the United Nations, Rome. http://faostat3.fao.org/</ref>


Truncated lifespan as a result of intensive breeding allows more meat to be produced from fewer animals. The world cattle population was about 600 million in 1929, with 700&nbsp;million sheep and goats and 300&nbsp;million pigs.<ref name="Otter 2020"/>
The occurrence, nature and significance of environmental effects varies among livestock production systems.<ref>Steinfeld, H. et al. 2006, Livestock’s Long Shadow: Environmental Issues and Options. Livestock, Environment and Development, FAO.</ref> Grazing of livestock can be beneficial for some wildlife species, but not for others.<ref>{{cite journal | last1 = Holechek | first1 = J. L. | display-authors = etal | year = 1982 | title = Manipulation of grazing to improve or maintain wildlife habitat | url = | journal = Wildlife Soc. Bull. | volume = 10 | issue = | pages = 204–210 }}</ref><ref>{{cite journal | last1 = Strassman | first1 = B. I. | year = 1987 | title = Effects of cattle grazing and haying on wildlife conservation at National Wildlife Refuges in the United States | url = | journal = Environmental Mgt. | volume = 11 | issue = | pages = 35–44 | doi=10.1007/bf01867177}}</ref> Targeted grazing of livestock is used as a food-producing alternative to herbicide use in some vegetation management.<ref>Launchbaugh, K. (ed.) 2006. Targeted Grazing: a natural approach to vegetation management and landscape enhancement. American Sheep Industry. 199 pp.</ref> Meat-producing livestock can provide environmental benefits through waste reduction, e.g. conversion of human-inedible residues of food crops.<ref>{{cite journal | last1 = Anderson | first1 = D. C. | year = 1978 | title = Use of cereal residues in beef cattle production systems | url = | journal = J. Anim. Sci. | volume = 46 | issue = | pages = 849–861 }}</ref><ref>{{cite journal | last1 = Elferink | first1 = E. V. | last2 = Nonhebel | first2 = S. | last3 = Moll | first3 = H. C. | year = 2008 | title = Feeding livestock food residue and the consequences for the environmental impact of meat | url = | journal = J. Cleaner Prod. | volume = 16 | issue = 12| pages = 1227–1233 | doi=10.1016/j.jclepro.2007.06.008}}</ref> Manure from meat-producing livestock is used as fertilizer; it may be composted before application to food crops. Substitution of animal manures for synthetic fertilizers in crop production can be environmentally significant, as between 43 and 88 MJ of fossil fuel energy are used per kg of nitrogen in manufacture of synthetic nitrogenous fertilizers.<ref>Shapouri, H. et al. 2002. The energy balance of corn ethanol: an update. USDA Agricultural Economic Report 814.</ref>


=== Trends ===
According to a report produced by ]'s (UNEP) international panel for sustainable resource management, a worldwide transition in the direction of a meat and dairy free diet is indispensable if adverse global climate change were to be prevented.<ref name="TG-20100602">{{cite news|url=http://www.theguardian.com/environment/2010/jun/02/un-report-meat-free-diet|title=UN urges global move to meat and dairy-free diet|last=Carus|first=Felicity|date=2010-06-02|work=The Guardian|accessdate=11 June 2015}}</ref>


{{further|List of countries by meat consumption|List of countries by meat production}}
== Spoilage and preservation ==
{{Main article|Meat spoilage|Meat preservation}}
The spoilage of meat occurs, if untreated, in a matter of hours or days and results in the meat becoming unappetizing, poisonous or infectious. Spoilage is caused by the practically unavoidable infection and subsequent ] of meat by ] and ], which are borne by the animal itself, by the people handling the meat, and by their implements. Meat can be kept edible for a much longer time – though not indefinitely – if proper ] is observed during production and processing, and if appropriate ], ] and ] procedures are applied. Without the application of ]s and stabilizers, the fats in meat may also begin to rapidly decompose after cooking or processing, leading to an objectionable taste known as ].


{{Multiple image
== Methods of preparation{{anchor|Processed meat}} ==
|direction=horizontal <!--it can't be vertical, that wrecks formatting for the multiple sections below-->
] at a street fair in New York City's ].]]
|align=center
Fresh meat can be cooked for immediate consumption, or be processed, that is, treated for longer-term ] and later consumption, possibly after further preparation. Fresh meat cuts or processed cuts may produce iridescence, commonly thought to be due to spoilage but actually caused structural coloration and ] of the light.<ref name=foods>{{cite journal | url=http://www.mdpi.com/2304-8158/2/4/499 | title=Foods | work=Iridescence in Meat Caused by Surface Gratings | date=November 2013 | accessdate=March 1, 2014 | author=Martinez-Hurtado, J L | volume=2 | pages=499–506 |doi=10.3390/foods2040499 | issue=4}}</ref> A common additive to processed meats, both for preservation and because it prevents discoloring, is ], which, however, is also a source of health concerns, because it may form ] ]s when heated.<ref>{{cite book |title=Nitrite Curing of Meat: The N-Nitrosamine Problem and Nitrite Alternatives |author=Ronald B. Pegg |author2=Fereidoon Shahidi |publisher=John Wiley & Sons |year=2004 |isbn=0-917678-50-8}}</ref>
|width=300
|image1=Meat Atlas 2014 -- Meat Consumption in industrialised countries.png
|image2=Meat Atlas 2014 meat consumption developing countries.png
|caption1=While meat consumption in most industrialized countries is at high, stable levels...<ref name="Meat Atlas">] 2014 – Facts and figures about the animals we eat, pp. 46–48, download as {{Webarchive|url=https://web.archive.org/web/20180708020301/https://www.foeeurope.org/meat-atlas |date=July 8, 2018 }}</ref>
|caption2=... it is rising in emerging economies.<ref name="Meat Atlas"/>
}}


{{Multiple image
Meat is prepared in many ways, as ]s, in ]s, ], or as ] like beef jerky. It may be ground then formed into patties (as ]s or croquettes), loaves, or ]s, or used in loose form (as in "sloppy joe" or ]).
|direction=horizontal <!--it can't be vertical, that wrecks formatting for the multiple sections below-->
]
|align=center
Some meat is cured by ], which is the process of ], ], or ] ] by exposing it to the ] from burning or smoldering plant materials, most often ]. In ], ] is the traditional smoking wood, but ] is more often used now, and ] to a lesser extent.<!--Lesser extent than oak, or alder??? --> In ], ], ], oak, ], alder, ], and fruit-tree woods are commonly used for smoking. Meat can also be cured by ], preserving in ] or ] (see ] and other ] methods). Other kinds of meat are ] and ]d, or simply boiled, ], or ].
|width=300
|image1=Per capita annual meat consumption by region.png
|caption1=Per capita annual meat consumption by region<ref name="10.1146/annurev-resource-111820-032340">{{cite journal |last1=Parlasca |first1=Martin C. |last2=Qaim |first2=Matin |title=Meat Consumption and Sustainability |journal=Annual Review of Resource Economics |date=October 5, 2022 |volume=14 |pages=17–41 |doi=10.1146/annurev-resource-111820-032340 |doi-access=free }}</ref>
|image2=Total annual meat consumption by region.png
|caption2=Total annual meat consumption by region
|image3=Total annual meat consumption by type of meat.png
|caption3=Total annual meat consumption by type of meat
}}


According to the ], the overall consumption for ] has increased from the 20th to the 21st centuries. Poultry meat has increased by 76.6% per kilo per capita and pig meat by 19.7%. Bovine meat has decreased from {{convert|10.4|kg|lboz|abbr=on}} per capita in 1990 to {{convert|9.6|kg|lboz|abbr=on}} per capita in 2009.<ref>{{cite journal |last1=Henchion |first1=Maeve |last2=McCarthy |first2=Mary |last3=Resconi |first3=Virginia C. |last4=Troy |first4=Declan |title=Meat consumption: Trends and quality matters |journal=Meat Science |date=November 2014 |volume=98 |issue=3 |pages=561–568 |doi=10.1016/j.meatsci.2014.06.007 |pmid=25060586 |hdl=11019/767 |url=https://t-stor.teagasc.ie/bitstream/11019/767/1/Meat%20Consumption_Trends%20and%20Quality%20Matters%20TStor%20%282%29.pdf |access-date=September 24, 2019 |archive-url=https://web.archive.org/web/20171102215030/http://t-stor.teagasc.ie/bitstream/11019/767/1/Meat%20Consumption_Trends%20and%20Quality%20Matters%20TStor%20%282%29.pdf |archive-date=November 2, 2017 |url-status=live |hdl-access=free }}</ref> FAO analysis found that 357 million tonnes of meat were produced in 2021, 53% more than in 2000, with chicken meat representing more than half the increase.<ref name=":14">{{Cite book |title=World Food and Agriculture – Statistical Yearbook 2023 |date=2023 |publisher=] |url=https://www.fao.org/documents/card/en?details=cc8166en |access-date=2023-12-13 |doi=10.4060/cc8166en|isbn=978-92-5-138262-2 }}</ref>
Meat is generally eaten cooked, but many recipes call for raw beef, veal or fish (]). ] is a meat dish made from finely chopped or minced ] ] or ].<ref>{{cite book|title=A Great American Cook: Recipes from the Home Kitchen of One of Our Most Influential Chefs|first1=Jonathan|last1= Waxman|first2= Tom|last2= Steele|first3= Bobby |last3= Flay|first4= John |last4=Kernick|publisher=Houghton Mifflin Harcourt|year= 2007|isbn=0-618-65852-1}}</ref><ref>Raymond Sokolov, ''The Cook's Canon'', 2003, ISBN 0-06-008390-5, p. 183 </ref> Meat is often spiced or seasoned, particularly with meat products such as sausages. Meat dishes are usually described by their source (animal and part of body) and method of preparation (e.g., a beef rib).


Overall, diets that include meat are the most common worldwide according to the results of a 2018 ] study of 16–64 years olds in 28 countries. Ipsos states "An omnivorous diet is the most common diet globally, with non-meat diets (which can include fish) followed by over a tenth of the global population." Approximately 87% of people include meat in their diet in some frequency. 73% of meat eaters included it in their diet regularly and 14% consumed meat only occasionally or infrequently. Estimates of the non-meat diets were analysed. About 3% of people followed vegan diets, where consumption of meat, eggs, and dairy are abstained from. About 5% of people followed vegetarian diets, where consumption of meat is abstained from, but egg and/or dairy consumption is not strictly restricted. About 3% of people followed ] diets, where consumption of the meat of land animals is abstained from, fish meat and other seafood is consumed, and egg and/or dairy consumption may or may not be strictly restricted.<ref>{{cite web |url=https://www.ipsos.com/sites/default/files/ct/news/documents/2018-09/an_exploration_into_diets_around_the_world.pdf |title=An exploration into diets around the world |date=August 2018 |website=Ipsos |location=UK |pages=2, 10, 11 |archive-url=https://web.archive.org/web/20190512072037/https://www.ipsos.com/sites/default/files/ct/news/documents/2018-09/an_exploration_into_diets_around_the_world.pdf |archive-date=May 12, 2019 |url-status=live}}</ref>
Meat is a typical base for making ]es. Popular varieties of sandwich meat include ], ], ] and other sausages, and ], such as ], ], ], ], and ]. Meat can also be molded or pressed (common for products that include offal, such as ] and ]) and ].


The type of meat consumed varies between different cultures. The amount and kind of meat consumed varies by income, both between countries and within a given country.<ref>Mark Gehlhar and William Coyle, {{webarchive |url=https://web.archive.org/web/20120905083755/http://www.ers.usda.gov/media/293589/wrs011c_1_.pdf |date=September 5, 2012}}, Chapter 1 in {{webarchive |url=https://web.archive.org/web/20130226030129/http://@ers.usda.gov/publications/wrs-international-agriculture-and-trade-outlook/wrs01-1.aspx |date=February 26, 2013 }}, edited by Anita Regmi, May 2001. USDA Economic Research Service.</ref> ] are commonly eaten in countries such as France,<ref>{{cite web |date=June 14, 2007 |title=France's horsemeat lovers fear US ban |url=http://www.theguardian.com/world/2007/jun/15/france.lifeandhealth |access-date=December 30, 2022 |website=] }}</ref> Italy, Germany and Japan.<ref>] (2006). Tom Jaine, Jane Davidson and Helen Saberi. eds. '']''. Oxford: ]. {{ISBN|0-19-280681-5}}, pp. 387–388</ref> Horses and other large ]s such as ] were hunted during the late ] in western Europe.<ref>Turner, E. 2005. "Results of a recent analysis of horse remains dating to the Magdalenian period at Solutre, France," pp. 70–89. In Mashkour, M (ed.). ''Equids in Time and Space.'' Oxford: Oxbow</ref> ] are consumed in China,<ref>{{cite news|url=http://news.bbc.co.uk/2/hi/programmes/from_our_own_correspondent/2074073.stm |title=Programmes – From Our Own Correspondent – China's taste for the exotic |publisher=BBC |date=June 29, 2002 |access-date=February 4, 2011 |archive-url=https://web.archive.org/web/20110201234909/http://news.bbc.co.uk/2/hi/programmes/from_our_own_correspondent/2074073.stm |archive-date=February 1, 2011 |url-status=live}}</ref> South Korea<ref>{{cite journal |last1=Podberscek |first1=A.L. |title=Good to Pet and Eat: The Keeping and Consuming of Dogs and Cats in South Korea |doi=10.1111/j.1540-4560.2009.01616.x |journal=] |volume=65 |issue=3 |pages=615–632 |year=2009 |url=http://www.animalsandsociety.org/assets/265_podberscek.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110719054520/http://www.animalsandsociety.org/assets/265_podberscek.pdf |archive-date=July 19, 2011 |citeseerx=10.1.1.596.7570 }}</ref> and Vietnam.<ref>{{cite news |url=http://news.bbc.co.uk/2/hi/asia-pacific/1735647.stm |title=Asia-Pacific – Vietnam's dog meat tradition |publisher=] |date=December 31, 2001 |access-date=February 4, 2011 |archive-url=https://web.archive.org/web/20110722165946/http://news.bbc.co.uk/2/hi/asia-pacific/1735647.stm |archive-date=July 22, 2011 |url-status=live}}</ref> Dogs are occasionally eaten in the ] regions.<ref> {{webarchive |url=https://web.archive.org/web/20110706205404/http://arctic.synergiesprairies.ca/arctic/index.php/arctic/article/viewFile/3691/3666 |date=July 6, 2011 }}</ref> Historically, dog meat has been consumed in various parts of the world, such as Hawaii,<ref name="auto">{{Cite book |last=Schwabe |first=Calvin W. |url=https://books.google.com/books?id=SiBntk9jGmoC |title=Unmentionable Cuisine |date=1979 |publisher=University of Virginia Press |isbn=978-0-8139-1162-5}}</ref> Japan,<ref>{{cite book |last=Hanley |first=Susan B. |title=Everyday Things in Premodern Japan: The Hidden Legacy of Material Culture |url=https://books.google.com/books?id=f7E5a9CIploC&pg=PA66 |year=1997 |publisher=] |isbn=978-0-520-92267-9 |page=66}}</ref> Switzerland<ref name="auto"/> and Mexico.<ref>] (2006). Tom Jaine, Jane Davidson and Helen Saberi. eds. '']''. Oxford: ]. {{ISBN|0-19-280681-5}}, p. 491</ref> ] are sometimes eaten, such as in Peru.<ref>{{cite web |title=Carapulcra de gato y gato a la parrilla sirven en fiesta patronal |url=http://www.cronicaviva.com.pe/index.php/regional/costa/3749-carapulcra-de-gato-y-gato-a-la-parilla-sirven-en-fiesta-patronal- |work=Cronica Viva |access-date=December 1, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20101117142920/http://cronicaviva.com.pe/index.php/regional/costa/3749-carapulcra-de-gato-y-gato-a-la-parilla-sirven-en-fiesta-patronal- |archive-date=November 17, 2010 }}</ref> ]s are raised for their flesh in the ].<ref>{{cite news |title=A Guinea Pig for All Times and Seasons |url=http://www.economist.com/node/2926169 |newspaper=] |access-date=December 1, 2011 |date=July 15, 2004 |archive-url=https://web.archive.org/web/20120222030533/http://www.economist.com/node/2926169 |archive-date=February 22, 2012 |url-status=live}}</ref> ]s and ]s are hunted, partly for their flesh, in several countries.<ref>{{cite web |title=Whaling in Lamaera-Flores|url=http://www.profauna.net/sites/default/files/downloads/publication-2005-whaling-in-lamalera.pdf |access-date=April 10, 2013|archive-url=https://web.archive.org/web/20130620014201/http://www.profauna.net/sites/default/files/downloads/publication-2005-whaling-in-lamalera.pdf |archive-date=June 20, 2013 |url-status=live}}</ref> Misidentification is a risk; in 2013, products in Europe labelled as beef ].<ref>{{cite news |last=Castle |first=Stephen |date=April 16, 2013 |title=Europe Says Tests Show Horse Meat Scandal Is 'Food Fraud' |work=] |url=https://www.nytimes.com/2013/04/17/business/global/european-study-affirms-role-of-fraud-in-horsemeat-scandal.html |access-date=December 30, 2022}}</ref>
== Health ==
{{See also|Red meat#Potential health risks|l1=Health concerns associated with red meat}}
A study of 400,000 subjects conducted by the ] and published in 2013 showed "a moderate positive association between processed meat consumption and mortality, in particular due to cardiovascular diseases, but also to cancer."<ref name=BMC03713>{{cite journal|author=Sabine Rohrmann, Kim Overvad, H Bas Bueno-de-Mesquita, Marianne U Jakobsen, Rikke Egeberg, Anne Tjønneland, Laura Nailler, Marie-Christine Boutron-Ruault, Françoise Clavel-Chapelon, Vittorio Krogh, Domenico Palli, Salvatore Panico, Rosario Tumino, Fulvio Ricceri, Manuela M Bergmann, Heiner Boeing, Kuanrong Li, Rudolf Kaaks, Kay-Tee Khaw, Nicholas J Wareham, Francesca L Crowe, Timothy J Key, Androniki Naska, Antonia Trichopoulou, Dimitirios Trichopoulos, Max Leenders, Petra HM Peeters, Dagrun Engeset, Christine L Parr, Guri Skeie, Paula Jakszyn, María-José Sánchez, José M Huerta, M Luisa Redondo, Aurelio Barricarte, Pilar Amiano, Isabel Drake, Emily Sonestedt, Göran Hallmans, Ingegerd Johansson, Veronika Fedirko, Isabelle Romieux, Pietro Ferrari, Teresa Norat, Anne C Vergnaud, Elio Riboli, Jakob Linseisen|title=Meat consumption and mortality – results from the E uropean Prospective Investigation into Cancer and Nutrition|journal=BMC Medicine|date=March 7, 2013|volume=11:63|doi=10.1186/1741-7015-11-63|url=https://www.biomedcentral.com/1741-7015/11/63/abstract|accessdate=March 7, 2013|author2=European Prospective Investigation into Cancer and Nutrition|authorlink2=European Prospective Investigation into Cancer and Nutrition|quote=The results of our analysis support a moderate positive association between processed meat consumption and mortality, in particular due to cardiovascular diseases, but also to cancer.|pages=63}}</ref>


{{anchor|Processed meat}}
A 1999 ] combined data from five studies from western countries. The metastudy reported ]s, where lower numbers indicated fewer deaths, for fish eaters to be 0.82, vegetarians to be 0.84, occasional meat eaters to be 0.84. Regular meat eaters and vegans shared the highest mortality ratio of 1.00.<ref name="AJCN metastudy">{{cite journal|title= Mortality in vegetarians and non-vegetarians: detailed findings from a collaborative analysis of 5 prospective studies|journal= American Journal of Clinical Nutrition|volume= 70|issue=3|pages=516S–524S|date = September 1999|url=http://ajcn.nutrition.org/content/70/3/516s.full|accessdate=May 20, 2013|author= Timothy J Key, Gary E Fraser, Margaret Thorogood, Paul N Appleby, Valerie Beral, Gillian Reeves, Michael L Burr, Jenny Chang-Claude, Rainer Frentzel-Beyme, Jan W Kuzma, Jim Mann and Klim McPherson |pmid= 10479225|doi=10.1079/phn19980006}}</ref>


=== Methods of preparation ===
In response to changing prices as well as health concerns about saturated fat and cholesterol, consumers have altered their consumption of various meats. A USDA report points out that consumption of beef in the United States between 1970–1974 and 1990–1994 dropped by 21%, while consumption of ] increased by 90%.<ref>http://www.ers.usda.gov/publications/foodreview/jan1996/frjan96f.pdf</ref> During the same period of time, the price of chicken dropped by 14% relative to the price of beef. In 1995 and 1996, beef consumption increased due to higher supplies and lower prices.


Meat can be cooked in many ways, including ], ], ], ], and ].<ref>{{cite web |title=Meat Cooking Methods |url=https://animalscience.unl.edu/meat-cooking-methods |publisher=University of Nebraska-Lincoln Institute of Agriculture and Natural Resources |access-date=17 February 2024}}</ref> Meat can be ] by ], which preserves and flavors food by exposing it to smoke from burning or smoldering wood<!-- such as beech or apple-->.<ref>{{cite news |url=https://www.independent.co.uk/life-style/food-and-drink/features/smoked-food-on-a-plate-9198295.html |title=Smoked food... on a plate |first=Hilly |last=Janes |newspaper=The Independent |location=London |date=2001-11-10 |access-date=2023-08-28 |url-status=live |url-access=registration |archive-url=https://web.archive.org/web/20220706132708/http://www.independent.co.uk/life-style/food-and-drink/features/smoked-food-on-a-plate-9198295.html |archive-date=2022-07-06}}</ref> Other methods of curing include ], ], and air-drying.<ref>{{cite web |last=Nummer |first=Brian A. |title=Historical Origins of Food Preservation |website=National Center for Home Food Preservation |url=https://nchfp.uga.edu/publications/nchfp/factsheets/food_pres_hist.html |access-date=2 January 2023 |date=May 2002 |archive-date=October 15, 2011 |archive-url=https://web.archive.org/web/20111015194629/http://www.uga.edu/nchfp/publications/nchfp/factsheets/food_pres_hist.html |url-status=dead }}</ref> Some recipes call for raw meat; ] is made from minced raw beef.<ref>{{cite web |title=Steak tartare: Traditional Appetizer From France |website=TasteAtlas |url=https://www.tasteatlas.com/steak-tartare |access-date=2023-11-03}}</ref> ]s are made with ground meat and fat, often including ].<ref>{{cite web |title=Demystifying French Soft Charcuterie |url=https://guide.michelin.com/en/article/features/%E6%B3%95%E5%BC%8F%E8%82%9D%E9%86%AC%E8%88%87%E8%82%89%E9%86%AC |access-date=2 July 2021 |website=MICHELIN Guide |archive-date=6 March 2022 |archive-url=https://web.archive.org/web/20220306223240/https://guide.michelin.com/en/article/features/%E6%B3%95%E5%BC%8F%E8%82%9D%E9%86%AC%E8%88%87%E8%82%89%E9%86%AC |url-status=live}}</ref>
The ''2015–2020 Dietary Guidelines for Americans'' asked men and teenage boys to increase their consumption of vegetables or other underconsumed foods because they eat too much protein.<ref>"Some individuals, especially teen boys and adult men, also need to reduce overall intake of protein foods by decreasing intakes of meats, poultry, and eggs and increasing amounts of vegetables or other underconsumed food groups." in {{cite web|publisher=U.S. Department of Health and Human Services and U.S. Department of Agriculture.|title=2015 – 2020 Dietary Guidelines for Americans: Shifts Needed To Align With Healthy Eating Patterns: A Closer Look at Current Intakes and Recommended Shifts: Protein Foods|edition=8|date=December 2015|url=http://health.gov/dietaryguidelines/2015/guidelines/chapter-2/a-closer-look-at-current-intakes-and-recommended-shifts/|accessdate=January 9, 2016}}</ref>


<gallery class=center mode=nolines widths=220 heights=220 caption="Types of meat and techniques used to prepare it">
Various toxic compounds can contaminate meat, including ], ], ] residues, and ]. Often, these compounds are not very dangerous themselves but can be metabolized in the body to form harmful by-products, so any actual toxicological effects may depend on the individual genome, diet, and history of the consumer.<ref name="Püssa"/>
File:Janjetina i odojak na ražnju u Novalji.2 (cropped).jpg |] a lamb and a suckling pig
File:Копчіння тушок гусей.jpg |Geese being ]
File:Papaz yahnisi - cooking.jpg |] mutton with vegetables
File:Pan frying sausages.jpg |] pork sausages in a pan
File:Steak Tartare in Dresden.jpg |Raw beef: ]
File:Duck Liver Pâté.jpg |Duck ]
</gallery>

== Health effects ==

{{Further|Red meat#Health effects}}

Meat, in particular red and processed meat, is linked to a variety of health risks.<ref name="who"/><ref name="Staph"/> The ''2015–2020 ]'' asked men and teenage boys to increase their consumption of vegetables or other underconsumed foods (fruits, whole grains, and dairy) while reducing intake of protein foods (meats, poultry, and eggs) that they currently overconsume.<ref>{{Cite web |title=2015-2020 Dietary Guidelines |url=https://health.gov/our-work/nutrition-physical-activity/dietary-guidelines/previous-dietary-guidelines/2015 |access-date=December 30, 2022 |website=health.gov}}</ref>

=== Contamination ===

Toxic compounds including ], ]s, ] residues, ]s, ] can contaminate meat. Processed, smoked and cooked meat may contain ]s such as ].<ref name=PAHs/> Toxins may be introduced to meat as part of animal feed, as veterinary drug residues, or during processing and cooking. Such compounds are often metabolized in the body to form harmful by-products. Negative effects depend on the individual genome, diet, and history of the consumer.<ref name="Püssa">{{Cite journal |last=Püssa |first=Tõnu |date=December 1, 2013 |title=Toxicological issues associated with production and processing of meat |journal=Meat Science |volume=95 |issue=4 |pages=844–853 |doi=10.1016/j.meatsci.2013.04.032 |pmid=23660174}}</ref>


=== Cancer === === Cancer ===
Carcinogenesis is the main long-term toxic response of consuming meat and meat byproducts.<ref name="Püssa">{{Cite journal|last=Püssa|first=Tõnu|date=2013-12-01|title=Toxicological issues associated with production and processing of meat|url=http://www.ncbi.nlm.nih.gov/pubmed/23660174|journal=Meat Science|volume=95|issue=4|pages=844–853|doi=10.1016/j.meatsci.2013.04.032|issn=1873-4138|pmid=23660174}}</ref>


{{main|Red meat#Cancer}}
Health concerns have been raised about the consumption of meat increasing the risk of cancer.<ref name="PLoS" /> In particular, red meat and processed meat were found to be associated with higher risk of cancers of the ], esophagus, liver, and ], among others — although also a reduced risk for some minor type of cancers.<ref name="PLoS">{{cite journal | last = Cross | first = Amanda | title = A Prospective Study of Red and Processed Meat Intake in Relation to Cancer Risk | journal = PLoS Medicine | volume = 4 | issue = 12 | publisher = the Public Library of Science | doi = 10.1371/journal.pmed.0040325 | year = 2007 | pages = e325 | pmid = 18076279 | last2 = Leitzmann | first2 = MF | last3 = Gail | first3 = MH | last4 = Hollenbeck | first4 = AR | last5 = Schatzkin | first5 = A | last6 = Sinha | first6 = R | pmc = 2121107 }}</ref>

The consumption of processed and red meat carries an increased risk of cancer. The ] (IARC), a specialized agency of the ] (WHO), classified processed meat (e.g., bacon, ham, hot dogs, sausages) as, "carcinogenic to humans (Group 1), based on sufficient evidence in humans that the consumption of processed meat causes colorectal cancer."<ref name="who">{{cite web |title=Q&A on the carcinogenicity of the consumption of red meat and processed meat |url=https://www.who.int/features/qa/cancer-red-meat/en/ |publisher=World Health Organization |access-date=August 7, 2019 |date=October 1, 2015}}</ref><ref>. paho.org. Retrieved March 22, 2023.</ref> IARC classified red meat as "probably carcinogenic to humans (Group 2A), based on limited evidence that the consumption of red meat causes cancer in humans and strong mechanistic evidence supporting a carcinogenic effect."<ref name="WHO-20151026">{{cite news |author=Staff |title=World Health Organization – IARC Monographs evaluate consumption of red meat and processed meat |url=http://www.iarc.fr/en/media-centre/pr/2015/pdfs/pr240_E.pdf |work=] |access-date=October 26, 2015 |archive-url=https://web.archive.org/web/20151026144543/http://www.iarc.fr/en/media-centre/pr/2015/pdfs/pr240_E.pdf |archive-date=October 26, 2015 |url-status=live }}</ref><!--<ref name="NYT-20151026">{{cite news |last=Hauser |first=Christine |title=W.H.O. Report Links Some Cancers With Processed or Red Meat |url=https://www.nytimes.com/2015/10/27/health/report-links-some-types-of-cancer-with-processed-or-red-meat.html |date=October 26, 2015 |work=] |access-date=October 26, 2015 |archive-url=https://web.archive.org/web/20151026173834/http://www.nytimes.com/2015/10/27/health/report-links-some-types-of-cancer-with-processed-or-red-meat.html |archive-date=October 26, 2015 |url-status=live }}</ref><ref name="BBC-20151026">{{cite news |author=Staff |title=Processed meats do cause cancer – WHO |url=https://www.bbc.co.uk/news/health-34615621 |date=October 26, 2015 |work=] |access-date=October 26, 2015 |archive-url=https://web.archive.org/web/20151026101723/http://www.bbc.co.uk/news/health-34615621 |archive-date=October 26, 2015 |url-status=live}}</ref>-->

], ] (NHS) and the ] have stated that red and processed meat intake increases risk of ].<ref>. nhs.uk. Retrieved March 22, 2023.</ref><ref>. cancerresearchuk.org. Retrieved March 22, 2023.</ref><ref>. progressreport.cancer.gov. Retrieved March 22, 2023.</ref> The ] in their "Diet and Physical Activity Guideline", stated "evidence that red and processed meats increase cancer risk has existed for decades, and many health organizations recommend limiting or avoiding these foods."<ref>{{cite journal |title=American Cancer Society guideline for diet and physical activity for cancer prevention |journal=CA |date=2020 |doi=10.3322/caac.21591 |last1=Rock |first1=Cheryl L. |last2=Thomson |first2=Cynthia |last3=Gansler |first3=Ted |last4=Gapstur |first4=Susan M. |last5=McCullough |first5=Marjorie L. |last6=Patel |first6=Alpa V. |last7=Andrews |first7=Kimberly S. |last8=Bandera |first8=Elisa V. |last9=Spees |first9=Colleen K. |last10=Robien |first10=Kimberly |last11=Hartman |first11=Sheri |last12=Sullivan |first12=Kristen |last13=Grant |first13=Barbara L. |last14=Hamilton |first14=Kathryn K. |last15=Kushi |first15=Lawrence H. |last16=Caan |first16=Bette J. |last17=Kibbe |first17=Debra |last18=Black |first18=Jessica Donze |last19=Wiedt |first19=Tracy L. |last20=McMahon |first20=Catherine |last21=Sloan |first21=Kirsten |last22=Doyle |first22=Colleen |display-authors=6 |volume=70 |issue=4 |pages=245–271 |pmid=32515498 |s2cid=219550658|doi-access=free }}</ref> The ] have stated that "eating red and processed meat increases cancer risk".<ref>. cancer.ca. Retrieved April 10, 2023.</ref>

A 2021 review found an increase of 11–51% risk of multiple cancer per 100g/d increment of red meat, and an increase of 8–72% risk of multiple cancer per 50g/d increment of processed meat.<ref>{{cite journal |vauthors=Huang Y, Cao D, Chen Z, Chen B, Li J, Guo J, Dong Q, Liu L, Wei Q |title=Red and processed meat consumption and cancer outcomes: Umbrella review |journal=Food Chem |volume=356 |pages=129697 |date=September 2021 |pmid=33838606 |doi=10.1016/j.foodchem.2021.129697 |type=Review}}</ref>

Cooking muscle meat creates ]s (HCAs), which are thought to increase cancer risk in humans. Researchers at the National Cancer Institute published results of a study which found that human subjects who ate beef rare or medium-rare had less than one third the risk of stomach cancer than those who ate beef medium-well or well-done.<ref>{{cite web |url=http://www.cancer.gov/cancertopics/factsheet/Risk/heterocyclic-amines |title=National Cancer Institute – Heterocyclic Amines in Cooked Meats |publisher=Cancer.gov |date=September 15, 2004 |access-date=May 1, 2010 |archive-url=https://web.archive.org/web/20101221034421/http://www.cancer.gov/cancertopics/factsheet/Risk/heterocyclic-amines |archive-date=December 21, 2010 |url-status=live }}</ref> While eating muscle meat raw may be the only way to avoid HCAs fully, the ] states that cooking meat below {{convert|212|F|C|order=flip}} creates "negligible amounts" of HCAs. ] meat before cooking may reduce HCAs by 90%.<ref>{{cite web |url=http://www.cancer.gov/cancertopics/factsheet/Risk/heterocyclic-amines |title=Heterocyclic Amines in Cooked Meats – National Cancer Institute |publisher=Cancer.gov |date=September 15, 2004 |access-date=May 1, 2010 |archive-url=https://web.archive.org/web/20101221034421/http://www.cancer.gov/cancertopics/factsheet/Risk/heterocyclic-amines |archive-date=December 21, 2010 |url-status=live }}</ref> ]s, present in processed and cooked foods, are carcinogenic, being linked to colon cancer. ]s, present in processed, smoked and cooked foods, are similarly carcinogenic.<ref name="PAHs">{{cite web|url=http://ec.europa.eu/food/fs/sc/scf/out154_en.pdf |title=PAH-Occurrence in Foods, Dietary Exposure and Health Effects |access-date=May 1, 2010 |url-status=dead |archive-url=https://web.archive.org/web/20110519225348/http://ec.europa.eu/food/fs/sc/scf/out154_en.pdf |archive-date=May 19, 2011 }}</ref>

=== Bacterial contamination ===

Bacterial contamination has been seen with meat products. A 2011 study by the ] showed that nearly half (47%) of the meat and poultry in U.S. grocery stores were contaminated with '']'', with more than half (52%) of those bacteria resistant to antibiotics.<ref name="Staph">{{cite web|url=https://www.sciencedaily.com/releases/2011/04/110415083153.htm|title=US Meat and Poultry Is Widely Contaminated With Drug-Resistant Staph Bacteria|work=sciencedaily.com|access-date=March 9, 2018|archive-url=https://web.archive.org/web/20170707081303/https://www.sciencedaily.com/releases/2011/04/110415083153.htm|archive-date=July 7, 2017|url-status=live}}</ref> A 2018 investigation by the ] and '']'' found that around 15 percent of the US population suffers from foodborne illnesses every year. The investigation highlighted unsanitary conditions in US-based meat plants, which included meat products covered in excrement and abscesses "filled with pus".<ref>{{cite news |last=Wasley |first=Andrew |date=February 21, 2018 |title='Dirty meat': Shocking hygiene failings discovered in US pig and chicken plants |url=https://www.theguardian.com/animals-farmed/2018/feb/21/dirty-meat-shocking-hygiene-failings-discovered-in-us-pig-and-chicken-plants |work=] |access-date=February 24, 2018 |archive-url=https://web.archive.org/web/20180223222127/https://www.theguardian.com/animals-farmed/2018/feb/21/dirty-meat-shocking-hygiene-failings-discovered-in-us-pig-and-chicken-plants |archive-date=February 23, 2018 |url-status=live }}</ref>

Complete cooking and the careful avoidance of recontamination reduce the risk of bacterial infections from meat.<ref>{{cite journal |pmc=2518970 |title=Colonic protein fermentation and promotion of colon carcinogenesis by thermolyzed casein |last1=Corpet |first1=Denis |last2=Yin |first2=Y. |last3=Zhang |first3=X. |last4=Rémésy |first4=C. |last5=Stamp |first5=D. |last6=Medline |first6=A. |last7=Thompson |first7=L. |last8=Bruce |first8=W. |last9=Archer |first9=M. |display-authors=6 |year=1995 |pmid=7603887 |doi=10.1080/01635589509514381 |volume=23 |issue=3 |journal=Nutr Cancer |pages=271–281}}</ref>

=== Diabetes ===

Consumption of 100 g/day of red meat and 50 g/day of processed meat is associated with an increased risk of ].<ref name="Giosuè Calabrese Riccardi Vaccaro 2022">{{cite journal |last1=Giosuè |first1=Annalisa |last2=Calabrese |first2=Ilaria |last3=Riccardi |first3=Gabriele |last4=Vaccaro |first4=Olga |last5=Vitale |first5=Marilena |title=Consumption of different animal-based foods and risk of type 2 diabetes: An umbrella review of meta-analyses of prospective studies |journal=Diabetes Research and Clinical Practice |volume=191 |date=2022 |doi=10.1016/j.diabres.2022.110071 |page=110071|pmid=36067917 }}</ref>

] advises people to limit their intake of red and processed meat.<ref>. diabetes.org.uk. Retrieved March 22, 2023.</ref><ref>. diabetes.org.uk. Retrieved March 22, 2023.</ref>


=== Infectious diseases ===
The ] (IARC) is the specialized cancer agency of the ] (WHO). IARC classified processed meat (e.g., bacon, ham, hot dogs, sausages) as, "''carcinogenic to humans'' (Group 1), based on ''sufficient evidence'' in humans that the consumption of processed meat causes colorectal cancer." IARC also classified red meat as "''probably carcinogenic to humans'' (Group 2A), based on ''limited evidence'' that the consumption of red meat causes cancer in humans and ''strong'' mechanistic evidence supporting a carcinogenic effect."<ref name="WHO-20151026">{{cite news |author=Staff |title=World Health Organization - IARC Monographs evaluate consumption of red meat and processed meat |url=http://www.iarc.fr/en/media-centre/pr/2015/pdfs/pr240_E.pdf |format=] |work=] |accessdate=October 26, 2015 }}</ref><ref name="NYT-20151026">{{cite news |last=Hauser |first=Christine |title=W.H.O. Report Links Some Cancers With Processed or Red Meat |url=http://www.nytimes.com/2015/10/27/health/report-links-some-types-of-cancer-with-processed-or-red-meat.html |date=October 26, 2015 |work=] |accessdate=October 26, 2015 }}</ref><ref name="BBC-20151026">{{cite news |author=Staff |title=Processed meats do cause cancer - WHO |url=http://www.bbc.co.uk/news/health-34615621 |date=October 26, 2015 |work=] |accessdate=October 26, 2015 }}</ref>


Meat production and trade substantially increase risks for infectious diseases (]), including ], whether though contact with wild and farmed animals, or via husbandry's environmental impact.<ref name="10.1016/j.foodres.2020.109341">{{cite journal |last1=González |first1=Neus |last2=Marquès |first2=Montse |last3=Nadal |first3=Martí |last4=Domingo |first4=José L. |title=Meat consumption: Which are the current global risks? A review of recent (2010–2020) evidences |journal=Food Research International |date=November 1, 2020 |volume=137 |pages=109341 |doi=10.1016/j.foodres.2020.109341 |pmid=33233049 |pmc=7256495 }}</ref><ref>{{cite journal |last1=Greger |first1=Michael |title=Primary Pandemic Prevention |journal=American Journal of Lifestyle Medicine |date=September 2021 |volume=15 |issue=5 |pages=498–505 |doi=10.1177/15598276211008134 |pmid=34646097 |pmc=8504329}}</ref> For example, ] from poultry meat production is a threat to human health.<ref>{{cite journal |last1=Sutton |first1=Troy C. |title=The Pandemic Threat of Emerging H5 and H7 Avian Influenza Viruses |journal=Viruses |date=September 2018 |volume=10 |issue=9 |pages=461 |doi=10.3390/v10090461 |pmid=30154345 |pmc=6164301 |doi-access=free }}</ref> Furthermore, the use of antibiotics in meat production contributes to ]<ref>{{cite journal |last1=Monger |first1=Xavier C. |last2=Gilbert |first2=Alex-An |last3=Saucier |first3=Linda |last4=Vincent |first4=Antony T. |title=Antibiotic Resistance: From Pig to Meat |journal=Antibiotics |date=October 2021 |volume=10 |issue=10 |pages=1209 |doi=10.3390/antibiotics10101209 |pmid=34680790 |pmc=8532907 |doi-access=free }}</ref><ref>{{cite journal |last1=Clifford |first1=Katie |last2=Desai |first2=Darash |last3=Prazeres da Costa |first3=Clarissa |last4=Meyer |first4=Hannelore |last5=Klohe |first5=Katharina |last6=Winkler |first6=Andrea |last7=Rahman |first7=Tanvir |last8=Islam |first8=Taohidul |last9=Zaman |first9=Muhammad H |title=Antimicrobial resistance in livestock and poor quality veterinary medicines |journal=] |date=September 1, 2018 |volume=96 |issue=9 |pages=662–664 |doi=10.2471/BLT.18.209585 |doi-broken-date=December 5, 2024 |pmid=30262949 |pmc=6154060 }}</ref> – which contributes to millions of deaths<ref name=":8">{{Cite journal |last1=Murray |first1=Christopher JL |last2=Ikuta |first2=Kevin Shunji |last3=Sharara |first3=Fablina |last4=Swetschinski |first4=Lucien |last5=Aguilar |first5=Gisela Robles |last6=Gray |first6=Authia |last7=Han |first7=Chieh |last8=Bisignano |first8=Catherine |last9=Rao |first9=Puja |last10=Wool |first10=Eve |last11=Johnson |first11=Sarah C. |display-authors=6 |date=January 19, 2022 |title=Global burden of bacterial antimicrobial resistance in 2019: a systematic analysis |journal=] |volume=399 |issue=10325 |pages=629–655 glish |doi=10.1016/S0140-6736(21)02724-0 |pmid=35065702 |pmc=8841637 |s2cid=246077406}}</ref> – and makes it harder to control infectious diseases.<!--<ref>{{cite journal |last1=Greger |first1=Michael |date=September 2021 |title=Primary Pandemic Prevention |journal=American Journal of Lifestyle Medicine |volume=15 |issue=5 |pages=498–505 |doi=10.1177/15598276211008134 |pmc=8504329 |pmid=34646097 |s2cid=235503730}}</ref>--><ref>{{cite journal |last1=Walker |first1=Polly |last2=Rhubart-Berg |first2=Pamela |last3=McKenzie |first3=Shawn |last4=Kelling |first4=Kristin |last5=Lawrence |first5=Robert S. |date=June 2005 |title=Public health implications of meat production and consumption |journal=Public Health Nutrition |volume=8 |issue=4 |pages=348–356 |doi=10.1079/PHN2005727 |pmid=15975179 |s2cid=59196 |doi-access=free }}</ref><ref>{{cite journal |last1=Hafez |first1=Hafez M. |last2=Attia |first2=Youssef A. |date=2020 |title=Challenges to the Poultry Industry: Current Perspectives and Strategic Future After the COVID-19 Outbreak |journal=] |volume=7 |page=516 |doi=10.3389/fvets.2020.00516 |pmc=7479178 |pmid=33005639 |doi-access=free}}</ref><ref>{{cite journal |last1=Mehdi |first1=Youcef |last2=Létourneau-Montminy |first2=Marie-Pierre |last3=Gaucher |first3=Marie-Lou |last4=Chorfi |first4=Younes |last5=Suresh |first5=Gayatri |last6=Rouissi |first6=Tarek |last7=Brar |first7=Satinder Kaur |last8=Côté |first8=Caroline |last9=Ramirez |first9=Antonio Avalos |last10=Godbout |first10=Stéphane |display-authors=6 |date=June 1, 2018 |title=Use of antibiotics in broiler production: Global impacts and alternatives |journal=Animal Nutrition |volume=4 |issue=2 |pages=170–178 |doi=10.1016/j.aninu.2018.03.002 |pmc=6103476 |pmid=30140756}}</ref>
Another study found an increase risk of pancreatic cancer for red meat and pork. That study noted that, "findings suggest that intakes of red meat and processed meat are positively associated with pancreatic cancer risk and thus are potential target factors for disease prevention. Future analyses of meat and pancreatic cancer risk should focus on meat preparation methods and related carcinogens." <ref>{{cite journal|url=http://jnci.oxfordjournals.org/cgi/content/full/97/19/1458?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=pancreatic+red+meat&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT |title=Meat and Fat Intake as Risk Factors for Pancreatic Cancer: The Multiethnic Cohort Study – Nöthlings et al. 97 (19): 1458 – JNCI Journal of the National Cancer Institute |doi=10.1093/jnci/dji292 |publisher=Jnci.oxfordjournals.org |accessdate=May 1, 2010|last1=Nothlings|first1=U.|last2=Wilkens|first2=L. R.|last3=Murphy|first3=S. P.|last4=Hankin|first4=J. H.|last5=Henderson|first5=B. E.|last6=Kolonel|first6=L. N.|journal=JNCI Journal of the National Cancer Institute|volume=97|issue=19|pages=1458–1465}}</ref>


=== Changes in consumer behavior ===
That study also suggests that fat and saturated fat are not likely contributors to pancreatic cancer. Animal fat, particularly from ruminants, tends to have a higher percentage of ] vs. monounsaturated and polyunsaturated fat when compared to vegetable fats, with the exception of some tropical plant fats;<ref>{{cite web|url=http://www.nutristrategy.com/nutritioninfo2.htm |title=Nutrients, Vitamins, Minerals and Dietary Information |publisher=Nutristrategy.com |accessdate=May 1, 2010}}</ref> consumption of which has been correlated with various health problems. The saturated fat found in meat has been associated with significantly raised risks of ],<ref>{{cite web | date=August 21, 2007 | url=http://www.cancer.org/docroot/NWS/content/NWS_1_1x_What_You_Eat_May_Influence_Colon_Cancer_Relapse.asp| title= What You Eat May Influence Colon Cancer Relapse| publisher= American Cancer Society| accessdate=July 21, 2008 |archiveurl = https://web.archive.org/web/20080419131054/http://www.cancer.org/docroot/NWS/content/NWS_1_1x_What_You_Eat_May_Influence_Colon_Cancer_Relapse.asp <!-- Bot retrieved archive --> |archivedate = April 19, 2008}}</ref><ref>{{cite journal|journal=British Journal of Cancer |url=http://www.nature.com/bjc/journal/v96/n7/full/6603689a.html |title=Meat consumption and risk of breast cancer in the UK Women's Cohort Study |doi=10.1038/sj.bjc.6603689 |accessdate=May 1, 2010 |volume=96 |issue=7|last1=Taylor|first1=E F|last2=Burley|first2=V J|last3=Greenwood|first3=D C|last4=Cade|first4=J E|pages=1139–46|pmid=17406351|pmc=2360120}}</ref> although evidence suggests that risks of prostate cancer are unrelated to animal fat consumption.<ref>{{cite journal
| last1 = Park | first1 = S. Y.
| last2 = Murphy | first2 = S. P.
| last3 = Wilkens | first3 = L. R.
| last4 = Henderson | first4 = B. E.
| last5 = Kolonel | first5 = L. N.
| title = Fat and meat intake and prostate cancer risk: The multiethnic cohort study
| doi = 10.1002/ijc.22805
| journal = International Journal of Cancer
| volume = 121
| issue = 6
| pages = 1339–1345
| year = 2007
| pmid = 17487838
| pmc =
}}</ref>


In response to changing ]s as well as health concerns about ], consumers have altered their consumption of various meats. Consumption of beef in the United States between 1970 and 1974 and 1990–1994 dropped by 21%, while consumption of ] increased by 90%.<ref>{{cite web |url=http://www.ers.usda.gov/publications/foodreview/jan1996/frjan96f.pdf |title=Archived copy |access-date=August 17, 2015 |url-status=dead |archive-url=https://web.archive.org/web/20060304100230/http://www.ers.usda.gov/publications/foodreview/jan1996/frjan96f.pdf |archive-date=March 4, 2006 }}</ref>
Other research does not support significant links between meat consumption and various cancers. Key et al. found that "There were no significant differences between vegetarians and nonvegetarians in mortality from cerebrovascular disease, stomach cancer, colorectal cancer, lung cancer, breast cancer, prostate cancer or all other causes combined."<ref>Key, T. J. , G. E. Fraser, M. Thorogood, P. N. Appleby, V. Beral, G. Reeves, M. L. Burr, J. Chang-Claude, R. Frentzel-Beyme, J. W. Kuzma, J. Mann and K. McPherson. 1999. Mortality in vegetarians and nonvegetarians: detailed findings from a collaborative analysis of 5 prospective studies. Am. J. Clin. Nutr. 70 (suppl.): 516S-524S</ref> Truswell reviewed numerous studies, concluding that the relationship of colorectal cancer with meat consumption appeared weaker than the "probable" status it had been given by the World Cancer Research Foundation in 1997.<ref>Truswell, A. S. 2002. Meat consumption and cancer of the large bowel. E. J. Clin. Nutr. 56: S19-S24.</ref> A study by Chao et al. (2005) found an apparent association of colorectal cancer with red meat consumption after adjustment for age and energy intake. However, after further adjustment for body mass index, cigarette smoking and other covariates, no association with red meat consumption was found.<ref>Chao, A., M. J. Thun, C. J. Connell, M. L. McCullough, E. J. Jacobs, W. D. Flanders, C. Rodriguez, R. Sinha and E. E. Calle. 2005. Meat consumption and risk of colorectal cancer. J. Am. Med. Assoc. 293: 172-182</ref> Alex' ander conducted a meta-analysis which found no association of colorectal cancer with consumption of animal fat or protein.<ref>{{cite journal | last1 = Alexander | first1 = D. D. | last2 = Cushing | first2 = C. A. | last3 = Lowe | first3 = K. A. | last4 = Sceurman | first4 = B. | last5 = Roberts | first5 = M. A. | year = 2009 | title = Meta-analysis of animal fat or animal protein intake and colorectal cancer | url = | journal = Am. J. Clin. Nutr. | volume = 89 | issue = | pages = 1402–1409 | doi=10.3945/ajcn.2008.26838}}</ref> Based on European data (EPIC-Oxford study), Key et al. found that incidence of colorectal cancer was somewhat lower among meat eaters than among vegetarians. However, they concluded that 'the study is not large enough to exclude small or moderate differences for specific causes of death, and more research on this topic is required'.<ref>Key, T. J., P. N. Appleby, E. A. Spencer, R. C. Travis, A. W. Roddam and N. E. Allen. 2009. Cancer incidence in vegetarians: results from the European Prospective Investigation into Cancer and Nutrition (EPIC-Oxford). Am. J. Clin. Nutr. 89 (suppl.): 1620S-1626S</ref> A study within the European Prospective Investigation into Cancer and Nutrition (EPIC) found that association between esophageal cancer risk and total and processed meat intake was not statistically significant.<ref>Gonzalez, C. A. et al. 2006. Meat Intake and Risk of Stomach and Esophageal Adenocarcinoma Within the European Prospective Investigation Into Cancer and Nutrition (EPIC). J. National Cancer Inst. 98: 345-354</ref> Another recent study of EPIC <ref>Sabine Rohrmann 2013 Meat consumption and mortality – results from the European Prospective Investigation into Cancer and Nutrition BMC Medicine 2013, 11:63 {{DOI|10.1186/1741-7015-11-63}}</ref> found a significant correlation between eating ' processed meat and cardiovascular diseases...also to cancer. In this population, reduction of processed meat consumption to less than 20&nbsp;g/day would prevent more than 3% of all deaths.'{{citation needed|date=November 2015}}


=== Heart disease === === Heart disease ===
The correlation of consumption to increased risk of ] is controversial. Some studies fail to find a link between red meat consumption and heart disease<ref>{{cite web|url=http://circ.ahajournals.org/cgi/content/abstract/CIRCULATIONAHA.109.924977v1|title=Red and Processed Meat Consumption and Risk of Incident Coronary Heart Disease, Stroke, and Diabetes Mellitus|author=Renata Micha|work=ahajournals.org}}</ref> (although the same study found statistically significant correlation between the consumption of processed meat and coronary heart disease), while another study, a survey, conducted in 1960, of 25,153 California Seventh-Day Adventists, found that the risk of heart disease is three times greater for 45- to 64-year-old men who eat meat daily, versus those who did not eat meat.<ref>{{cite journal
| last1 = Snowdon | first1 = D. A.
| last2 = Phillips | first2 = R. L.
| last3 = Fraser | first3 = G. E.
| title = Meat consumption and fatal ischemic heart disease
| journal = Preventive medicine
| volume = 13
| issue = 5
| pages = 490–500
| year = 1984
| pmid = 6527990
| doi=10.1016/0091-7435(84)90017-3
}}</ref> A major Harvard University study <ref>{{cite web|url=http://www.hsph.harvard.edu/news/press-releases/2010-releases/processed-meats-unprocessed-heart-disease-diabetes.html|title=Eating processed meats, but not unprocessed red meats, may raise risk of heart disease and diabetes|work=harvard.edu}}</ref> in 2010 involving over one million people who ate meat found that only processed meat had an adverse risk in relation to coronary heart disease. The study suggests that eating 50&nbsp;g (less than 2oz) of processed meat per day increases risk of coronary heart disease by 42%, and diabetes by 19%. Equivalent levels of fat, including saturated fats, in unprocessed meat (even when eating twice as much per day) did not show any deleterious effects, leading the researchers to suggest that "differences in salt and preservatives, rather than fats, might explain the higher risk of heart disease and diabetes seen with processed meats, but not with unprocessed red meats."


]
=== Obesity ===
The EPIC-PANACEA study, published in 2010 in the ''American Journal of Clinical Nutrition'' closely tracked 373,803 people over a period of 8 years across 10 countries. It concluded that meat consumption is positively associated with weight gain in men and women.<ref>{{Cite journal|title = Meat consumption and prospective weight change in participants of the EPIC-PANACEA study|url = http://www.ncbi.nlm.nih.gov/pubmed/20592131|journal = The American Journal of Clinical Nutrition|date = 2010-08-01|issn = 1938-3207|pmid = 20592131|pages = 398–407|volume = 92|issue = 2|doi = 10.3945/ajcn.2009.28713|first = Anne-Claire|last = Vergnaud|first2 = Teresa|last2 = Norat|first3 = Dora|last3 = Romaguera|first4 = Traci|last4 = Mouw|first5 = Anne M.|last5 = May|first6 = Noemie|last6 = Travier|first7 = Jian'an|last7 = Luan|first8 = Nick|last8 = Wareham|first9 = Nadia|last9 = Slimani}}</ref> The ] countered by stating that meat consumption may not be associated with fat gain.<ref>{{Cite journal|title = Meat intake's influence on body fatness cannot be assessed without measurement of body fat|url = http://www.ncbi.nlm.nih.gov/pubmed/20844064|journal = The American Journal of Clinical Nutrition|date = 2010-11-01|issn = 1938-3207|pmid = 20844064|pages = 1274-1275; author reply 1275-1276|volume = 92|issue = 5|doi = 10.3945/ajcn.110.000661|first = Arne|last = Astrup|first2 = Peter|last2 = Clifton|first3 = Donald K.|last3 = Layman|first4 = Richard D.|last4 = Mattes|first5 = Margriet S.|last5 = Westerterp-Plantenga}}</ref> In response, the authors of the original study controlled for just abdominal fat across a sample of 91,214 people and found that even when controlling for calories and lifestyle factors, meat consumption is linked with obesity.<ref>{{Cite journal|title = Reply to A Astrup et al|url = http://ajcn.nutrition.org/content/92/5/1275|journal = The American Journal of Clinical Nutrition|date = 2010-11-01|issn = 0002-9165|pages = 1275–1276|volume = 92|issue = 5|doi = 10.3945/ajcn.110.000786|first = Anne-Claire|last = Vergnaud|first2 = Teresa|last2 = Norat|first3 = Dora|last3 = Romaguera|first4 = Petra HM|last4 = Peeters}}</ref> Additional studies and reviews have confirmed the finding that greater meat consumption is positively linked with greater weight gain even when controlling for calories, and lifestyle factors.<ref>{{Cite journal|title = Cross-sectional association of nut intake with adiposity in a Mediterranean population|url = http://www.ncbi.nlm.nih.gov/pubmed/20219336|journal = Nutrition, metabolism, and cardiovascular diseases: NMCD|date = 2011-07-01|issn = 1590-3729|pmid = 20219336|pages = 518–525|volume = 21|issue = 7|doi = 10.1016/j.numecd.2009.11.010|first = P.|last = Casas-Agustench|first2 = M.|last2 = Bulló|first3 = E.|last3 = Ros|first4 = J.|last4 = Basora|first5 = J.|last5 = Salas-Salvadó}}</ref><ref>{{Cite journal|title = Plant and animal protein intake and its association with overweight and obesity among the Belgian population|url = http://www.ncbi.nlm.nih.gov/pubmed/21144092|journal = The British Journal of Nutrition|date = 2011-04-01|issn = 1475-2662|pmid = 21144092|pages = 1106–1116|volume = 105|issue = 7|doi = 10.1017/S0007114510004642|first = Yi|last = Lin|first2 = Selin|last2 = Bolca|first3 = Stefanie|last3 = Vandevijvere|first4 = Stephanie|last4 = De Vriese|first5 = Theodora|last5 = Mouratidou|first6 = Melissa|last6 = De Neve|first7 = Anja|last7 = Polet|first8 = Herman|last8 = Van Oyen|first9 = John|last9 = Van Camp}}</ref>


Except for poultry, at 50 g/day unprocessed red and processed meat are risk factors for ischemic heart disease, increasing the risk by about 9 and 18% respectively.<ref name="10.1080/10408398.2021.1949575"/><ref>{{cite journal |last1=Zhang |first1=X. |display-authors=etal |year=2022 |title=Red/processed meat consumption and non-cancer-related outcomes in humans: umbrella review |journal=British Journal of Nutrition|volume=22 |issue=3 |pages=484–494 |doi=10.1017/S0007114522003415 |pmid=36545687 |s2cid=255021441 }}</ref>
=== Bacterial contamination ===
A 2011 study by the ] showed that nearly half (47%) of the meat and ] in U.S. grocery stores were contaminated with '']'', with more than half (52%) of those bacteria resistant to antibiotics.<ref>{{cite web|url=http://www.sciencedaily.com/releases/2011/04/110415083153.htm|title=US Meat and Poultry Is Widely Contaminated With Drug-Resistant Staph Bacteria|work=sciencedaily.com}}</ref>


=== Cooking === == Environmental impact ==
Meat can transmit certain ]s, but complete cooking and avoiding recontamination reduces this possibility.<ref>{{cite journal |pmc=2518970 |title=Colonic protein fermentation and promotion of colon carcinogenesis by thermolyzed casein |last1=Corpet |first1=Denis |last2=Yin |first2=Y |last3=Zhang |first3=X |last4=Rémésy |first4=C |last5=Stamp |first5=D |last6=Medline |first6=A |last7=Thompson |first7=L |last8=Bruce |first8=W |last9=Archer |first9=M | displayauthors = 8|year= 1995|publisher=Nutr Cancer. |pmid=7603887 |doi=10.1080/01635589509514381 |volume=23 |issue=3 |journal=Nutr Cancer |pages=271–81}}</ref>


{{further|Environmental impacts of animal agriculture}}
Several studies published since 1990 indicate that cooking muscle meat creates ]s (HCAs), which are thought to increase cancer risk in humans. Researchers at the National Cancer Institute published results of a study which found that human subjects who ate beef rare or medium-rare had less than one third the risk of stomach cancer than those who ate beef medium-well or well-done.<ref>{{cite web|url=http://www.cancer.gov/cancertopics/factsheet/Risk/heterocyclic-amines |title=National Cancer Institute – Heterocyclic Amines in Cooked Meats |publisher=Cancer.gov |date=September 15, 2004 |accessdate=May 1, 2010}}</ref> While eating muscle meat raw may be the only way to avoid HCAs fully, the ] states that cooking meat below {{convert|212|F|lk=on}} creates "negligible amounts" of HCAs. Also, ] meat before cooking may reduce HCAs by 90%.<ref>{{cite web|url=http://www.cancer.gov/cancertopics/factsheet/Risk/heterocyclic-amines |title=Heterocyclic Amines in Cooked Meats – National Cancer Institute |publisher=Cancer.gov |date=September 15, 2004 |accessdate=May 1, 2010}}</ref>


A multitude of serious negative environmental effects are associated with meat production. Among these are greenhouse gas emissions, ] use, water use, water quality changes, and effects on grazed ecosystems. They are so significant that according to ] researchers, "a ] diet is probably the single biggest way to reduce your impact on planet Earth... far bigger than cutting down on your flights or buying an electric car".<ref>{{cite news |last1=Petter |first1=Olivia |title=Veganism is 'single biggest way' to reduce our environmental impact, study finds |url=https://www.independent.co.uk/life-style/health-and-families/veganism-environmental-impact-planet-reduced-plant-based-diet-humans-study-a8378631.html |work=The Independent |date=September 24, 2020 |access-date=23 November 2023}}</ref> However, this is often ignored in the public consciousness and in plans to tackle serious environmental issues such as the ].<ref>{{cite news |last1=Dalton |first1=Jane |title=World leaders 'reckless for ignoring how meat and dairy accelerate climate crisis' |url=https://www.independent.co.uk/climate-change/news/climate-meat-dairy-diet-food-co2-b1951760.html |newspaper=] |access-date=23 November 2023}}</ref>
]s, present in processed and cooked foods, have been noted as being carcinogenic, being linked to colon cancer. Also, toxic compounds called PAHs, or ]s, present in processed, smoked and cooked foods, are known to be carcinogenic.<ref>{{cite web|url=http://ec.europa.eu/food/fs/sc/scf/out154_en.pdf |title=PAH-Occurrence in Foods, Dietary Exposure and Health Effects |format=PDF |accessdate=May 1, 2010}}</ref>


The livestock sector may be the largest source of ] (due to animal wastes, fertilizers, pesticides), and it contributes to emergence of antibiotic resistance. It accounts for over 8% of global human water use. It is a significant driver of ] and ]s, as it causes ],<ref>{{cite journal |url=https://ourworldindata.org/drivers-of-deforestation |title=Drivers of Deforestation |last=Ritchie |first=Hannah |author1-link=Hannah Ritchie |date=February 9, 2021 |journal=] |access-date=March 20, 2021 }}</ref> ocean ],<ref>{{cite news |last=Milman |first=Oliver |date=August 1, 2017 |title=Meat industry blamed for largest-ever 'dead zone' in Gulf of Mexico |url=https://www.theguardian.com/environment/2017/aug/01/meat-industry-dead-zone-gulf-of-mexico-environment-pollution |work=The Guardian |access-date=August 2, 2017 |archive-url=https://web.archive.org/web/20200119112425/https://www.theguardian.com/environment/2017/aug/01/meat-industry-dead-zone-gulf-of-mexico-environment-pollution |archive-date=January 19, 2020 |url-status=live }}</ref> species extinction,<ref>{{cite web |url=https://www.science.org/content/article/meat-eaters-may-speed-worldwide-species-extinction-study-warns |title=Meat-eaters may speed worldwide species extinction, study warns |first=Virginia |last=Morell |date=August 11, 2015 |work=] |access-date=January 10, 2017 |archive-url=https://web.archive.org/web/20161220105327/http://www.sciencemag.org/news/2015/08/meat-eaters-may-speed-worldwide-species-extinction-study-warns |archive-date=December 20, 2016 |url-status=live}}</ref><ref>{{cite web |url=https://www.theguardian.com/environment/radical-conservation/2015/oct/20/the-four-horsemen-of-the-sixth-mass-extinction |title=How humans are driving the sixth mass extinction |first=Jeremy |last=Hance |date=October 20, 2015 |work=] |access-date=January 10, 2017 |archive-url=https://web.archive.org/web/20161204223902/https://www.theguardian.com/environment/radical-conservation/2015/oct/20/the-four-horsemen-of-the-sixth-mass-extinction |archive-date=December 4, 2016 |url-status=live}}</ref> ], pollution, ] and ].<ref>{{cite book |last1=Steinfeld |first1=Henning |last2=Gerber |first2=Pierre |last3=Wassenaar |first3=Tom |last4=Castel |first4=Vincent |last5=Rosales |first5=Mauricio |last6=de Haan |first6=Cees |date=2006 |title=Livestock's Long Shadow: Environmental Issues and Options |url=http://www.europarl.europa.eu/climatechange/doc/FAO%20report%20executive%20summary.pdf |publisher=] |isbn=978-92-5-105571-7 |page=xxiii |access-date=May 14, 2017 |archive-url=https://web.archive.org/web/20191210012108/http://www.europarl.europa.eu/climatechange/doc/FAO%20report%20executive%20summary.pdf |archive-date=December 10, 2019 |url-status=live}}</ref><ref name="Machovina 2015 419–431">{{cite journal |first1=B. |last1=Machovina |first2=K.J. |last2=Feeley |first3=W.J. |last3=Ripple |year=2015 |title=Biodiversity conservation: The key is reducing meat consumption |journal=Science of the Total Environment |volume=536 |pages=419–31 |doi=10.1016/j.scitotenv.2015.07.022 |pmid=26231772 |bibcode=2015ScTEn.536..419M}}</ref><ref name="10.1038/s43016-021-00358-x">{{cite journal |last1=Xu |first1=Xiaoming |last2=Sharma |first2=Prateek |last3=Shu |first3=Shijie |last4=Lin |first4=Tzu-Shun |last5=Ciais |first5=Philippe |last6=Tubiello |first6=Francesco N. |last7=Smith |first7=Pete |last8=Campbell |first8=Nelson |last9=Jain |first9=Atul K. |display-authors=6 |title=Global greenhouse gas emissions from animal-based foods are twice those of plant-based foods |journal=] |date=September 2021 |volume=2 |issue=9 |pages=724–732 |doi=10.1038/s43016-021-00358-x |pmid=37117472 |hdl=2164/18207 |s2cid=240562878 |hdl-access=free }}</ref> Cattle farming was estimated to be responsible for 80 per cent of Amazon deforestation in 2008 due to the clearing of forests to grow animal feed (especially soya) and cattle ranching.<ref>{{cite web |title=Unsustainable Cattle Ranching |url=https://wwf.panda.org/discover/knowledge_hub/where_we_work/amazon/amazon_threats/unsustainable_cattle_ranching/? |website=wwf.org |publisher=World Wildlife Fund |access-date=23 November 2023}}</ref>
== Meat in society==
Meat is part of the human diet in most cultures, where it often has symbolic meaning and important social functions.<ref>{{cite journal|journal=Appetite |url=http://www.sciencedirect.com/science/article/pii/S0195666315001166 |title=Meat traditions. Co-evolution of humans and meat |doi=10.1016/j.appet.2015.03.014 |accessdate=April 11, 2015 |volume=90 |last1=Leroy|first1=F|last2=Praet|first2=I|pages=200–211|pmid= 25794684 |date=Jul 2015}}</ref> Many people, however, choose not to eat meat (this is referred to as ]) or any food made from animals (]). The reasons for not eating all or some meat may include ethical objections to killing animals for food, health concerns, environmental concerns or religious ].


Environmental effects vary among livestock production systems.<ref>Steinfeld, H. et al. 2006, Livestock's Long Shadow: Environmental Issues and Options. Livestock, Environment and Development, FAO.</ref> Grazing of livestock can be beneficial for some wildlife species, but not for others.<ref>{{cite journal |last1=Holechek |first1=J. L. |display-authors=etal |year=1982 |title=Manipulation of grazing to improve or maintain wildlife habitat |journal=Wildlife Society Bulletin |volume=10 |pages=204–10 }}</ref><ref>{{cite journal |last1=Strassman |first1=B.I. |year=1987 |title=Effects of cattle grazing and haying on wildlife conservation at National Wildlife Refuges in the United States |url =https://deepblue.lib.umich.edu/bitstream/2027.42/48162/1/267_2005_Article_BF01867177.pdf |journal=Environmental Management |volume=11 |issue=1 |pages=35–44 |doi=10.1007/bf01867177 |bibcode=1987EnMan..11...35S |hdl=2027.42/48162 |s2cid=55282106 |hdl-access=free }}</ref> Targeted grazing of livestock is used as a food-producing alternative to herbicide use in some vegetation management.<ref>Launchbaugh, K. (ed.) 2006. Targeted Grazing: a natural approach to vegetation management and landscape enhancement. American Sheep Industry. 199 pp.</ref>
=== Ethics of eating meat ===
{{Main article|Ethics of eating meat}}
Ethical issues regarding the consumption of meat can include objections to the act of killing animals or to the ] used in meat production. Reasons for objecting to killing animals for consumption may include ], ], or an aversion to inflicting ] or harm on other ]. Some people, while not vegetarians, refuse to eat the flesh of certain animals, such as cows, pigs, cats, dogs, horses, or rabbits, due to cultural or religious traditions.


=== Land use ===
Some people eat only the flesh of animals which they believe have not been mistreated, and abstain from the meat of animals reared in ] or from particular products such as ] and ]. Some people also abstain from milk and its derivatives because the production of veal is a byproduct of the ]. The ethical issues with factory farming relate to the high concentration of animals, animal waste, and the potential for dead animals in a small space. Critics argue that some techniques used in intensive agriculture can be cruel to animals. Foie gras is a ] made of the ] of ] or ] that has been specially fattened by ] them corn. Veal is criticised because the veal calves may be highly restricted in movement; have unsuitable flooring; spend their entire lives indoors; experience prolonged sensory, social, and exploratory deprivation; and are more susceptible to high amounts of stress and disease.<ref>http://www.hsus.org/farm/resources/research/welfare/welfare_veal_calves.html</ref>

]

] for ].<ref>{{cite journal |last1=Rajão |first1=Raoni |last2=Soares-Filho |first2=Britaldo |last3=Nunes |first3=Felipe |last4=Börner |first4=Jan |last5=Machado |first5=Lilian |last6=Assis |first6=Débora |last7=Oliveira |first7=Amanda |last8=Pinto |first8=Luis |last9=Ribeiro |first9=Vivian |last10=Rausch |first10=Lisa |last11=Gibbs |first11=Holly |last12=Figueira |first12=Danilo |display-authors=6 |title=The rotten apples of Brazil's agribusiness |journal=] |date=July 17, 2020 |volume=369 |issue=6501 |pages=246–248 |doi=10.1126/science.aba6646 |pmid=32675358 |bibcode=2020Sci...369..246R |s2cid=220548355 }}</ref><ref>{{cite news |title=Amazon soya and beef exports 'linked to deforestation' |url=https://www.bbc.com/news/science-environment-53438680 |work=BBC News |date=July 17, 2020}}</ref><ref>{{cite journal |last1=zu Ermgassen |first1=Erasmus K. H. J. |last2=Godar |first2=Javier |last3=Lathuillière |first3=Michael J. |last4=Löfgren |first4=Pernilla |last5=Gardner |first5=Toby |last6=Vasconcelos |first6=André |last7=Meyfroidt |first7=Patrick |title=The origin, supply chain, and deforestation risk of Brazil's beef exports |journal=Proceedings of the National Academy of Sciences |date=December 15, 2020 |volume=117 |issue=50 |pages=31770–31779 |doi=10.1073/pnas.2003270117 |pmid=33262283 |pmc=7749302 |bibcode=2020PNAS..11731770Z |doi-access=free }}</ref><ref>{{cite news |last1=McCoy |first1=Terrence |last2=Ledur |first2=Júlia |title=How Americans' love of beef is helping destroy the Amazon rainforest |url=https://www.washingtonpost.com/world/interactive/2022/amazon-beef-deforestation-brazil/ |access-date=May 27, 2022 |newspaper=The Washington Post}}</ref>]]

Meat production is by far the biggest user of land, as it accounts for nearly 40% of the global land surface.<ref>{{cite web |url=http://www.cnn.com/2016/12/12/world/sutter-vanishing-help/ |title=How to stop the sixth mass extinction |first=John D. |last=Sutter |date=December 12, 2016 |publisher=] |access-date=January 10, 2017 |archive-url=https://web.archive.org/web/20170112083004/http://www.cnn.com/2016/12/12/world/sutter-vanishing-help/ |archive-date=January 12, 2017 |url-status=live}}</ref> Just in the contiguous United States, 34% of its land area ({{convert |654 |e6acre |e6ha |order=flip |abbr=off |disp=or}}) are used as pasture and rangeland, mostly feeding livestock, not counting {{convert |391 |e6acre |e6ha |order=flip |abbr=off}} of cropland (20%), some of which is used for producing feed for livestock.<ref>{{Cite news |url=https://www.bloomberg.com/graphics/2018-us-land-use/ |title=Here's How America Uses Its Land |last=Dave Merrill and Lauren Leatherby |newspaper=Bloomberg.com |url-status=live |archive-url=https://web.archive.org/web/20200225232852/https://www.bloomberg.com/graphics/2018-us-land-use/ |archive-date=February 25, 2020}}</ref> Roughly 75% of ] land around the globe is used for livestock ].<ref>{{cite book |last=Nibert |first=David |editor1=Steven Best |editor2=Richard Kahn |editor3=Anthony J. Nocella II |editor4=Peter McLaren |authorlink=David Nibert |editor1-link=Steven Best |editor4-link=Peter McLaren |date=2011 |title=The Global Industrial Complex: Systems of Domination |chapter=Origins and Consequences of the Animal Industrial Complex |publisher=] |page=206 |url=https://rowman.com/ISBN/9780739136973/The-Global-Industrial-Complex-Systems-of-Domination |isbn=978-0739136980}}</ref> Deforestation from practices like ] releases {{CO2}} and removes the ] of grown tropical forest ecosystems which substantially mitigate climate change.<ref>{{cite journal |last1=Lawrence |first1=Deborah |last2=Coe |first2=Michael |last3=Walker |first3=Wayne |last4=Verchot |first4=Louis |last5=Vandecar |first5=Karen |title=The Unseen Effects of Deforestation: Biophysical Effects on Climate |journal=] |year=2022 |volume=5 |doi=10.3389/ffgc.2022.756115 |bibcode=2022FrFGC...5.6115L |doi-access=free }}</ref> Land use is a major pressure on pressure on ] which is important for global ].<ref>{{cite journal |last1=Borrelli |first1=Pasquale |last2=Robinson |first2=David A. |last3=Panagos |first3=Panos |last4=Lugato |first4=Emanuele |last5=Yang |first5=Jae E. |last6=Alewell |first6=Christine |last7=Wuepper |first7=David |last8=Montanarella |first8=Luca |last9=Ballabio |first9=Cristiano |display-authors=6 |title=Land use and climate change impacts on global soil erosion by water (2015–2070) |journal=Proceedings of the National Academy of Sciences |date=August 20, 2020 |volume=117 |issue=36 |pages=21994–22001 |doi=10.1073/pnas.2001403117 |pmid=32839306 |pmc=7486701 |bibcode=2020PNAS..11721994B |s2cid=221305830 |doi-access=free }}
* News article: {{cite news |title=Climate change and land use are accelerating soil erosion by water |url=https://phys.org/news/2020-08-climate-soil-erosion.html |access-date=September 7, 2020 |work=phys.org}}</ref>

=== Climate change ===

{{See also |Livestock's Long Shadow}}

] of GHG emissions for foods. Beef is the food with the largest carbon footprint, mainly due to ].]]

The rising global consumption of ] meat products has "exploded the global carbon footprint of agriculture," according to some top scientists.<ref>{{cite news |last=Weston |first=Phoebe |date=January 13, 2021 |title=Top scientists warn of 'ghastly future of mass extinction' and climate disruption |url=https://www.theguardian.com/environment/2021/jan/13/top-scientists-warn-of-ghastly-future-of-mass-extinction-and-climate-disruption-aoe |work=] |access-date=January 14, 2021}}</ref><ref>{{cite journal |last1=Bradshaw |first1=Corey J. A. |last2=Ehrlich |first2=Paul R. |last3=Beattie |first3=Andrew |last4=Ceballos |first4=Gerardo |last5=Crist |first5=Eileen |last6=Diamond |first6=Joan |last7=Dirzo |first7=Rodolfo |last8=Ehrlich |first8=Anne H. |last9=Harte |first9=John |last10=Harte |first10=Mary Ellen |last11=Pyke |first11=Graham |last12=Raven |first12=Peter H. |last13=Ripple |first13=William J. |last14=Saltré |first14=Frédérik |last15=Turnbull |first15=Christine |last16=Wackernagel |first16=Mathis |last17=Blumstein |first17=Daniel T. |display-authors=6 |year=2021 |title=Underestimating the Challenges of Avoiding a Ghastly Future |journal=Frontiers in Conservation Science |volume=1 |doi=10.3389/fcosc.2020.615419 |doi-access=free }}</ref> Meat production is responsible for some 35% of global emissions of greenhouse gases, and 60% of the greenhouse gases attributable to food production.<ref name="Milman 2021">{{cite news |last1=Milman |first1=Oliver |title=Meat accounts for nearly 60% of all greenhouse gases from food production, study finds |url=https://www.theguardian.com/environment/2021/sep/13/meat-greenhouses-gases-food-production-study |work=] |date=13 September 2021 |quote=Source: Xu, et al., 2021, 'Global greenhouse gas emissions from animal-based foods are twice those of plant-based foods'}}</ref>

Some nations show very different impacts to counterparts within the same group, with Brazil and Australia having emissions over 200% higher than the average of their respective income groups, driven by meat consumption.<ref>{{Cite journal |last1=Behrens |first1=Paul |last2=Jong |first2=Jessica C. Kiefte-de |last3=Bosker |first3=Thijs |last4=Rodrigues |first4=João F.D. |last5=Koning |first5=Arjan de |last6=Tukker |first6=Arnold |date=December 19, 2017 |title=Evaluating the environmental impacts of dietary recommendations |journal=Proceedings of the National Academy of Sciences |volume=114 |issue=51 |pages=13412–17 |doi=10.1073/pnas.1711889114 |pmid=29203655 |pmc=5754780 |bibcode=2017PNAS..11413412B |doi-access=free}}</ref>

According to the '']'' report produced by ]'s (UNEP) international panel for sustainable resource management, a worldwide transition in the direction of a meat and dairy free diet is indispensable if adverse global climate change were to be prevented.<ref name="TG-20100602">{{cite news |url=https://www.theguardian.com/environment/2010/jun/02/un-report-meat-free-diet |title=UN urges global move to meat and dairy-free diet |last=Carus |first=Felicity |date=June 2, 2010 |work=] |access-date=June 11, 2015 |archive-url=https://web.archive.org/web/20180303145344/https://www.theguardian.com/environment/2010/jun/02/un-report-meat-free-diet |archive-date=March 3, 2018 |url-status=live}}</ref> A 2019 report in '']'' recommended that global meat (and sugar) consumption be reduced by 50 percent to ].<ref>{{cite news |last=Gibbens |first=Sarah |date=January 16, 2019 |title=Eating meat has 'dire' consequences for the planet, says report |url=https://www.nationalgeographic.com/environment/2019/01/commission-report-great-food-transformation-plant-diet-climate-change/ |work=] |access-date=February 14, 2019 |archive-url=https://web.archive.org/web/20190203030847/https://www.nationalgeographic.com/environment/2019/01/commission-report-great-food-transformation-plant-diet-climate-change/ |archive-date=February 3, 2019 |url-status=dead}}</ref> Meat consumption in Western societies needs to be reduced by up to 90% according to a 2018 study published in '']''.<ref>{{Cite journal |last1=Willett |first1=Walter |last2=Rockström |first2=Johan |last3=Tilman |first3=David |last4=Godfray |first4=H. Charles J. |last5=Fanzo |first5=Jess |last6=Loken |first6=Brent |last7=Rayner |first7=Mike |last8=Scarborough |first8=Peter |last9=Zurayk |first9=Rami |date=October 2018 |title=Options for keeping the food system within environmental limits |journal=Nature |volume=562 |issue=7728 |pages=519–525 |doi=10.1038/s41586-018-0594-0 |pmid=30305731 |bibcode=2018Natur.562..519S |s2cid=52954514 |url=https://publications.pik-potsdam.de/pubman/item/item_22704 }}</ref> The 2019 special report by the ] called for significantly reducing meat consumption, particularly in wealthy countries, in order to mitigate and adapt to climate change.<ref name="10.1038/d41586-019-02409-7">{{cite journal |last=Schiermeier |first=Quirin |date=August 8, 2019 |title=Eat less meat: UN climate change report calls for change to human diet |url=https://www.nature.com/articles/d41586-019-02409-7 |journal=] |volume=572 |issue=7769 |pages=291–292 |access-date=August 10, 2019 |archive-url=https://web.archive.org/web/20190809164640/https://www.nature.com/articles/d41586-019-02409-7 |archive-date=August 9, 2019 |url-status=live |doi=10.1038/d41586-019-02409-7 |pmid=31409926 |bibcode=2019Natur.572..291S |s2cid=199543066 }}</ref>

=== Biodiversity loss ===

Meat consumption is a primary contributor to the ].<ref name="Machovina 2015 419–431"/><ref>{{cite web |url=https://www.science.org/content/article/meat-eaters-may-speed-worldwide-species-extinction-study-warns |title=Meat-eaters may speed worldwide species extinction, study warns |first=Virginia |last=Morell |date=August 11, 2015 |work=] |access-date=December 14, 2016 |archive-url=https://web.archive.org/web/20161220105327/http://www.sciencemag.org/news/2015/08/meat-eaters-may-speed-worldwide-species-extinction-study-warns |archive-date=December 20, 2016 |url-status=live}}</ref> A 2017 study by the ] found that 60% of global ] is attributable to meat-based diets, in particular from the use of land for feed crops, resulting in large-scale loss of habitats and species.<ref>{{cite news |last=Smithers |first=Rebecca |date=October 5, 2017 |title=Vast animal-feed crops to satisfy our meat needs are destroying planet |url=https://www.theguardian.com/environment/2017/oct/05/vast-animal-feed-crops-meat-needs-destroying-planet |work=The Guardian |access-date=October 5, 2017 |archive-url=https://web.archive.org/web/20180303143952/https://www.theguardian.com/environment/2017/oct/05/vast-animal-feed-crops-meat-needs-destroying-planet |archive-date=March 3, 2018 |url-status=live}}</ref> Livestock make up 60% of the ] of all mammals on earth, followed by humans (36%) and wild mammals (4%).<ref>{{cite news |last=Carrington |first=Damian |date=May 21, 2018 |title=Humans just 0.01% of all life but have destroyed 83% of wild mammals – study |url=https://www.theguardian.com/environment/2018/may/21/human-race-just-001-of-all-life-but-has-destroyed-over-80-of-wild-mammals-study |work=The Guardian |access-date=June 29, 2018 |archive-url=https://web.archive.org/web/20180911035201/https://www.theguardian.com/environment/2018/may/21/human-race-just-001-of-all-life-but-has-destroyed-over-80-of-wild-mammals-study |archive-date=September 11, 2018 |url-status=live }}</ref><ref>{{cite journal |doi=10.1073/pnas.1711842115 |pmid=29784790 |pmc=6016768 |title=The biomass distribution on Earth |journal=] |volume=115 |issue=25 |pages=6506–11 |year=2018 |last1=Bar-On |first1=Yinon M. |last2=Phillips |first2=Rob |last3=Milo |first3=Ron |bibcode=2018PNAS..115.6506B |doi-access=free}}</ref> In November 2017, 15,364 world scientists signed a ] calling for a drastic reduction in per capita consumption of meat and "dietary shifts towards mostly plant-based foods".<ref>{{cite journal |last1=Ripple |first1=W.J. |display-authors=etal |title=World Scientists' Warning to Humanity: A Second Notice |journal=] |date=November 13, 2017 |volume=67 |issue=12 |pages=1026–1028 |doi=10.1093/biosci/bix125 |doi-access=free |hdl=11336/71342 |hdl-access=free}}</ref> The 2019 '']'' recommended a reduction in meat consumption to mitigate biodiversity loss.<ref>{{cite news |last=Watts |first=Jonathan |date=May 6, 2019 |title=Human society under urgent threat from loss of Earth's natural life |url=https://www.theguardian.com/environment/2019/may/06/human-society-under-urgent-threat-loss-earth-natural-life-un-report |work=] |access-date=May 18, 2019 |quote=Over the past week, representatives from the world's governments have fine-tuned the summary for policymakers, which includes remedial scenarios, such as "transformative change" across all areas of government, revised trade rules, massive investments in forests and other green infrastructure, and changes in individual behaviour such as lower consumption of meat and material goods. |archive-url=https://web.archive.org/web/20190518041123/https://www.theguardian.com/environment/2019/may/06/human-society-under-urgent-threat-loss-earth-natural-life-un-report |archive-date=May 18, 2019 |url-status=live}}</ref> A 2021 ] report asserted that a shift towards plant-based diets would free up land for the restoration of ecosystems and biodiversity.<ref name="Carrington">{{cite news |last=Carrington |first=Damian |date=February 3, 2021 |title=Plant-based diets crucial to saving global wildlife, says report |url=https://www.theguardian.com/environment/2021/feb/03/plant-based-diets-crucial-to-saving-global-wildlife-says-report |work=] |access-date=February 5, 2021}}</ref>

Meat consumption is predicted to rise as the human population increases and becomes more affluent; this in turn would increase greenhouse gas emissions and further reduce biodiversity.<!--<ref>{{cite news |last=Devlin |first=Hannah |date=July 19, 2018 |title=Rising global meat consumption 'will devastate environment' |url=https://www.theguardian.com/environment/2018/jul/19/rising-global-meat-consumption-will-devastate-environment |newspaper=] |access-date=July 21, 2018 |archive-url=https://web.archive.org/web/20180720104546/https://www.theguardian.com/environment/2018/jul/19/rising-global-meat-consumption-will-devastate-environment |archive-date=July 20, 2018 |url-status=live }}</ref>--><ref>{{cite journal |last1=Godfray |first1=H. Charles J. |last2=Aveyard |first2=Paul |display-authors=etal |year=2018 |title=Meat consumption, health, and the environment |url=https://ora.ox.ac.uk/objects/uuid:cc174e1d-0e3e-43ce-9d3b-ad7e204d0845 |journal=Science |volume=361 |issue=6399 |doi=10.1126/science.aam5324 |pmid=30026199 |bibcode=2018Sci...361M5324G |s2cid=49895246 |doi-access=free}}</ref>

=== Reducing environmental impact ===

The environmental impact of meat production can be reduced on the farm by conversion of human-inedible residues of food crops.<ref>{{cite journal |last1=Anderson |first1=D.C. |year=1978 |title=Use of cereal residues in beef cattle production systems |journal=J. Anim. Sci. |volume=46 |issue=3 |pages=849–61 |doi=10.2527/jas1978.463849x }}</ref><ref>{{cite journal |last1=Elferink |first1=E.V. |last2=Nonhebel |first2=S. |last3=Moll |first3=H.C. |year=2008 |title=Feeding livestock food residue and the consequences for the environmental impact of meat |journal=J. Clean. Prod. |volume=16 |issue=12 |pages=1227–33 |doi=10.1016/j.jclepro.2007.06.008|bibcode=2008JCPro..16.1227E }}</ref> Manure from meat-producing livestock is used as fertilizer; it may be composted before application to food crops. Substitution of animal manures for synthetic fertilizers in crop production can be environmentally significant, as between 43 and 88 MJ of fossil fuel energy are used per kg of nitrogen in manufacture of synthetic nitrogenous fertilizers.<ref>Shapouri, H. et al. 2002. The energy balance of corn ethanol: an update. USDA Agricultural Economic Report 814.</ref>

=== Reducing meat consumption ===

{{Main |Sustainable consumption#Sustainable food consumption}}

The IPCC and others have stated that meat production has to be reduced substantially for any sufficient ] climate change and, at least initially, largely through ] towards ]s where meat consumption is high.<ref name="10.1038/d41586-019-02409-7"/><ref name="10.1038/s43016-021-00431-5">{{cite journal |last1=Sun |first1=Zhongxiao |last2=Scherer |first2=Laura |last3=Tukker |first3=Arnold |last4=Spawn-Lee |first4=Seth A. |last5=Bruckner |first5=Martin |last6=Gibbs |first6=Holly K. |last7=Behrens |first7=Paul |title=Dietary change in high-income nations alone can lead to substantial double climate dividend |journal=Nature Food |date=January 2022 |volume=3 |issue=1 |pages=29–37 |doi=10.1038/s43016-021-00431-5 |pmid=37118487 |s2cid=245867412 |url=https://www.researchgate.net/publication/357723207 |url-access=subscription}}</ref><ref name="10.1146/annurev-resource-111820-032340"/> ] that ] of free meat consumption per person would be a form of restriction, ]es would be a type of fiscal mechanism. Meat can be replaced by, for example, high-protein iron-rich low-emission ]s and common fungi, ]s (e.g. of vitamin B<sub>12</sub> and zinc) and ]s,<ref>{{cite journal |last1=Craig |first1=Winston J. |last2=Mangels |first2=Ann Reed |last3=Fresán |first3=Ujué |last4=Marsh |first4=Kate |last5=Miles |first5=Fayth L. |last6=Saunders |first6=Angela V. |last7=Haddad |first7=Ella H. |last8=Heskey |first8=Celine E. |last9=Johnston |first9=Patricia |last10=Larson-Meyer |first10=Enette |last11=Orlich |first11=Michael |display-authors=6 |title=The Safe and Effective Use of Plant-Based Diets with Guidelines for Health Professionals |journal=Nutrients |date=November 19, 2021 |volume=13 |issue=11 |pages=4144 |doi=10.3390/nu13114144 |pmid=34836399 |pmc=8623061 |doi-access=free }}</ref> ], ],<ref>{{cite journal |last1=Humpenöder |first1=Florian |last2=Bodirsky |first2=Benjamin Leon |last3=Weindl |first3=Isabelle |last4=Lotze-Campen |first4=Hermann |last5=Linder |first5=Tomas |last6=Popp |first6=Alexander |title=Projected environmental benefits of replacing beef with microbial protein |journal=] |date=May 2022 |volume=605 |issue=7908 |pages=90–96 |doi=10.1038/s41586-022-04629-w |pmid=35508780 |bibcode=2022Natur.605...90H |s2cid=248526001 |url=https://publications.pik-potsdam.de/pubman/item/item_27105_5/component/file_27634/27105oa.pdf }}<br/>News article: {{cite news |title=Replacing some meat with microbial protein could help fight climate change |url=https://www.sciencenews.org/article/meat-microbial-protein-climate-change-deforestation-fungi-algae |access-date=May 27, 2022 |work=Science News |date=May 5, 2022}}</ref> ],<ref>{{cite book |last1=Bhuvaneswari |first1=Meganathan |last2=Sivakumar |first2=Nallusamy |title=Fungi in Sustainable Food Production |chapter=Fungi: A Potential Future Meat Substitute |series=Fungal Biology |year=2021 |pages=181–195 |doi=10.1007/978-3-030-64406-2_11 |publisher=Springer International Publishing |isbn=978-3-030-64405-5 |s2cid=234315964 }}</ref> ], and other alternatives,<ref>{{cite journal |last1=Lee |first1=Hyun Jung |last2=Yong |first2=Hae In |last3=Kim |first3=Minsu |last4=Choi |first4=Yun-Sang |last5=Jo |first5=Cheorun |title=Status of meat alternatives and their potential role in the future meat market – A review |journal=Asian-Australasian Journal of Animal Sciences |date=October 1, 2020 |volume=33 |issue=10 |pages=1533–1543 |doi=10.5713/ajas.20.0419 |pmid=32819080 |pmc=7463075 }}</ref> such as those based on mushrooms,<ref>{{Cite journal |last1=Sirimuangmoon |first1=Chirat |last2=Lee |first2=Soh-Min |last3=Guinard |first3=Jean-Xavier |last4=Myrdal Miller |first4=Amy |date=2016 |title=A Study of Using Mushrooms as a Plant-based Alternative for a Popular Meat-based Dish |url=https://so01.tci-thaijo.org/index.php/APST/article/view/62602 |journal=Asia-Pacific Journal of Science and Technology |publisher=] |volume=21 |issue=16 |pages=156–167 |doi=10.14456/KKURJ.2016.15 |s2cid=113606865}}</ref> legumes (pulses), and other food sources.<ref name="10.1016/j.appet.2020.105058">{{cite journal |last1=Onwezen |first1=M. C. |last2=Bouwman |first2=E. P. |last3=Reinders |first3=M. J. |last4=Dagevos |first4=H. |title=A systematic review on consumer acceptance of alternative proteins: Pulses, algae, insects, plant-based meat alternatives, and cultured meat |journal=Appetite |date=April 1, 2021 |volume=159 |pages=105058 |doi=10.1016/j.appet.2020.105058 |pmid=33276014 |s2cid=227242500 |doi-access=free }}</ref> Land previously used for meat production can be ].<ref name="10.1038/s43016-021-00431-5"/><ref name="10.1038/s43016-021-00358-x"/> The biologists ], Gerardo Ceballos, and ] state that it is the "massive planetary monopoly of industrial meat production that needs to be curbed" while respecting the cultural traditions of indigenous peoples, for whom meat is an important source of protein.<ref>{{cite journal |last1=Dirzo |first1=Rodolfo |last2=Ceballos |first2=Gerardo |last3=Ehrlich |first3=Paul R. |year=2022 |title=Circling the drain: the extinction crisis and the future of humanity |journal=] |volume=377 |issue=1857 |doi=10.1098/rstb.2021.0378 |pmid=35757873 |pmc=9237743 |quote=Although among many Indigenous populations, meat consumption represents a cultural tradition and a source of protein, it is the massive planetary monopoly of industrial meat production that needs to be curbed}}</ref>

== Cultural aspects ==

Meat is part of the human diet in most cultures, where it often has symbolic meaning and important social functions.<ref>{{cite journal |last1=Leroy |first1=Frédéric |last2=Praet |first2=Istvan |title=Meat traditions. The co-evolution of humans and meat |journal=Appetite |date=July 2015 |volume=90 |pages=200–211 |doi=10.1016/j.appet.2015.03.014 |pmid=25794684 |s2cid=23769488 }}</ref><!-- Some people choose not to eat meat (vegetarianism) or any food made from animals (]). The reasons for not eating all or some meat may include ethical objections to killing animals for food, health concerns, environmental concerns or religious ].-->

=== Ethical issues ===

{{Main|Ethics of eating meat}}

Ethical issues regarding the consumption of meat include objecting to the act of killing animals or to the ] used in meat production. Reasons for objecting to killing animals for consumption may include ], ], or an aversion to inflicting ] or harm on ]. Some people, while not vegetarians, refuse to eat the flesh of certain animals for cultural or religious reasons.<ref name="Sandler 2014">{{cite book |chapter=3. Should we eat animals? |url=https://books.google.com/books?id=0XXZBAAAQBAJ |title=Food Ethics: The Basics |last=Sandler |first=Ronald L. |publisher=Taylor & Francis |year=2014 |isbn=978-1-135-04547-0 |location=London |access-date=11 February 2018}}</ref>

The founders of ] disagreed about the ethics of eating meat. ]'s '']'' has ] describe the ideal state as vegetarian.<ref name=Buscemi>{{cite book |last1=Buscemi |first1=Francesco |title=From Body Fuel to Universal Poison: Cultural History of Meat: 1900–The Present |date=2018 |publisher=] International Publishing AG |isbn=978-3-319-72085-2 |pages=10–16}}</ref> ] believed that humans and animals were equal and therefore disapproved of meat consumption, as did ], whereas ] and ] were vegetarian but allowed meat-eating in their philosophy.<ref name=Buscemi/> Conversely, ]'s '']'' assert that animals, as inferior beings,<ref name=Aristotle>{{cite book |last1=Aristotle |title=The Politics |last2=Jowett |first2=B. |location=Ancient Greece |page=I. 8. 1256b |orig-date=355-323 BCE}}</ref> exist to serve humans, including as food.<ref name=Aristotle/><ref name=Buscemi/> ] drew on Aristotle to argue that the universe's natural hierarchy allows humans to eat animals, and animals to eat plants.<ref name=Buscemi/> ] philosophers were likewise divided. ] wrote that animals were merely animated machines, while ] considered them inferior beings for lack of discernment: means rather than ends.<ref name=Buscemi/> But ] and ] disagreed; Rousseau argued that meat-eating is a social rather than a natural act, because children are not interested in meat.<ref name=Buscemi/>

Later philosophers examined the changing practices of eating meat in the ] as part of a process of detachment from animals as living beings. ], for instance, noted that in medieval times cooked animals were brought to the table whole, but that since the ] only the edible parts are served, which are no longer recognizably part of an animal.<ref name=Buscemi/> Modern eaters, according to ], demand an "]" between meat and dead animals; for instance, calves' eyes are no longer considered a delicacy as in the Middle Ages, but provoke disgust.<ref name=Buscemi/> ] wrote that since the European diet of the 15th and 16th century was particularly heavy in meat, European ] helped export meat-eating across the globe, as colonized peoples took up the culinary habits of their colonizers, which they associated with wealth and power.<ref name=Buscemi/>


=== Religious traditions === === Religious traditions ===

{{Main article|Vegetarianism and religion}}
{{main|Vegetarianism and religion}}
The religion of ] has always opposed eating meat, and there are also ] and ] that condemn the eating of meat. ] dietary rules ('']'') allow certain ('']'') meat and forbid other ('']''). Among the numerous laws that form part of ''kashrut'' are the prohibitions on the consumption of ] (such as ], ] including ] and ], and most ]s), and mixtures of meat and milk. Similar rules apply in ]: The ] explicitly forbids meat from animals that die of themselves, blood, the meat of swine (porcine animals, pigs), and animals dedicated to other than Allah (either undedicated or dedicated to ]) which are ] as opposed to ]. ] forbids meat of slowly slaughtered animals ("]") and prescribes killing animals with a single strike ("]"), but some Sikh groups oppose eating any meat.<ref name="Takhar2005">{{cite book|last=Takhar|first=Opinderjit Kaur|title=Sikh identity: an exploration of groups among Sikhs|url=https://books.google.com/books?id=aeKWQzesOc4C&pg=PA51|accessdate=November 26, 2010|year=2005|publisher=Ashgate Publishing, Ltd.|isbn=978-0-7546-5202-1|page=51|chapter=2 Guru Nanak Nishkam Sewak Jatha}}</ref>

] nuns buying meat in Italy]]

Among the Indian religions, ] opposes the eating of meat, while some ] and ] advocate but do not mandate vegetarianism.<ref name="Tähtinen 1976">{{cite book |last=Tähtinen |first=Unto |title=Ahimsa: Non-Violence in Indian Tradition |year=1976 |location=London |publisher=Rider |pages=107–111}}</ref><ref name="Walters Portmess 2001">{{cite book |last1=Walters |first1=Kerry S. |author-link=Kerry S. Walters |last2=Portmess |first2=Lisa |title=Religious Vegetarianism From Hesiod to the Dalai Lama |year=2001 |location=Albany |publisher=State University of New York Press |pages=37–91}}</ref> Jewish '']'' dietary rules allow certain ('']'') meat and forbid other ('']'') meat. The rules prohibit the consumption of ] such as pork, and mixtures of meat and milk.<ref>{{Bibleverse ||Leviticus |11:3–8 |HE}}</ref> Similar rules apply in ]: The ] explicitly forbids meat from animals that die naturally, blood, and the meat of pigs, which are '']'', forbidden, as opposed to '']'', allowed.<ref>] 2:173, 5:3, 6:145, and 16:115.</ref> Some ] groups oppose eating any meat.<ref name="Takhar2005">{{cite book |last=Takhar |first=Opinderjit Kaur |title=Sikh identity: an exploration of groups among Sikhs |chapter-url=https://books.google.com/books?id=aeKWQzesOc4C&pg=PA51 |access-date=November 26, 2010 |year=2005 |publisher=Ashgate Publishing |isbn=978-0-7546-5202-1 |page=51 |chapter=2 Guru Nanak Nishkam Sewak Jatha}}</ref>


===Psychology=== ===Psychology===

{{main article|Psychology of eating meat}}
{{main|Psychology of eating meat}}
Research in ] has investigated practices of meat eating in relation to ], ]s, ], and ] characteristics.<ref name=Loughnan2014>{{cite journal|last1=Loughnan|first1=Steve|last2=Bastian|first2=Brock|last3=Haslam|first3=Nick|title=The Psychology of Eating Animals|journal=Current Directions in Psychological Science|date=2014|volume=23|issue=2|pages=104–108|doi=10.1177/0963721414525781|url=https://foodethics.univie.ac.at/fileadmin/user_upload/inst_ethik_wiss_dialog/Loughnan__S._2014_And_Bastian._..The_Psychology_of_Eating_Animals._In._CURRENT_DIRECTIONS_IN_PSYCHOLOGICAL_SCIENCE.pdf|accessdate=6 August 2015}}</ref> Psychological research suggests meat eating is correlated with ],<ref name=Rozin2012 >{{cite journal|last1=Rozin|first1=Paul|last2=Hormes|first2=Julia M.|last3=Faith|first3=Myles S.|last4=Wansink|first4=Brian|title=Is Meat Male? A Quantitative Multimethod Framework to Establish Metaphoric Relationships|journal=Journal of Consumer Research|date=October 2012|volume=39|issue=3|doi=10.1086/664970|pages=629–643}}</ref> ],<ref>{{cite journal|last1=Dhont|first1=Kristof|last2=Hodson|first2=Gordon|last3=Costello|first3=Kimberly|last4=MacInnis|first4=Cara C.|title=Social dominance orientation connects prejudicial human–human and human–animal relations|journal=Personality and Individual Differences|date=April 2014|volume=61|pages=104–108|doi=10.1016/j.paid.2013.12.020}}</ref> and reduced ].<ref name="Keller2015">{{cite journal|last1=Keller|first1=Carmen|last2=Seigrist|first2=Michael|title=Does personality influence eating styles and food choices? Direct and indirect effects|journal=Appetite|date=January 2015|volume=84|pages=128–138|doi=10.1016/j.appet.2014.10.003}}</ref> Research into the ] of meat is relevant both to ] ]<ref name=Richardson1994>{{cite journal|last1=Richardson, N. J.|title=Consumer Perceptions of Meat|journal=Meat Science|date=1994|volume=36|pages=57–65|doi=10.1016/0309-1740(94)90033-7|url=http://ac.els-cdn.com/0309174094900337/1-s2.0-0309174094900337-main.pdf?_tid=4bd13ec6-3f0d-11e5-b4ae-00000aab0f6c&acdnat=1439176384_7ae506be777cb5b5f07b9d4c5cea424c|accessdate=10 August 2015|display-authors=etal}}</ref> and to advocates of reduced meat consumption.<ref name="Klöckner 2014">{{cite journal | last=Zur | first=Ifat | last2=Klöckner | first2=Christian A. | title=Individual motivations for limiting meat consumption | journal=British Food Journal | publisher=Emerald | volume=116 | issue=4 | year=2014 | pages=629–642 | url=http://dx.doi.org/10.1108/BFJ-08-2012-0193 | doi=10.1108/bfj-08-2012-0193 | accessdate=2016-01-03}}</ref><ref name="Schösler">{{cite journal | last=Schösler | first=Hanna | last2=Boer | first2=Joop de | last3=Boersema | first3=Jan J. | title=Can we cut out the meat of the dish? Constructing consumer-oriented pathways towards meat substitution | journal=Appetite | publisher=Elsevier BV | volume=58 | issue=1 | year=2012 | pages=39–47 | url=http://dx.doi.org/10.1016/j.appet.2011.09.009 | doi=10.1016/j.appet.2011.09.009 | accessdate=2015-12-29}}</ref>

Research in ] has investigated meat eating in relation to ], ]s, ], and personality.<ref name=Loughnan2014>{{cite journal |last1=Loughnan |first1=Steve |last2=Bastian |first2=Brock |last3=Haslam |first3=Nick |title=The Psychology of Eating Animals |journal=Current Directions in Psychological Science |year=2014 |volume=23 |issue=2 |pages=104–108 |doi=10.1177/0963721414525781 |s2cid=145339463 |url=https://foodethics.univie.ac.at/fileadmin/user_upload/inst_ethik_wiss_dialog/Loughnan__S._2014_And_Bastian._..The_Psychology_of_Eating_Animals._In._CURRENT_DIRECTIONS_IN_PSYCHOLOGICAL_SCIENCE.pdf |access-date=August 6, 2015 |archive-url=https://web.archive.org/web/20180930183806/https://foodethics.univie.ac.at/fileadmin/user_upload/inst_ethik_wiss_dialog/Loughnan__S._2014_And_Bastian._..The_Psychology_of_Eating_Animals._In._CURRENT_DIRECTIONS_IN_PSYCHOLOGICAL_SCIENCE.pdf |archive-date=September 30, 2018 |url-status=live}}</ref> Psychological research suggests meat eating is correlated with ],<ref name=Rozin2012 >{{cite journal |last1=Rozin |first1=Paul |last2=Hormes |first2=Julia M. |last3=Faith |first3=Myles S. |last4=Wansink |first4=Brian |title=Is Meat Male? A Quantitative Multimethod Framework to Establish Metaphoric Relationships |journal=Journal of Consumer Research |date=October 2012 |volume=39 |issue=3 |doi=10.1086/664970 |pages=629–43}}</ref> and reduced ].<ref name="Keller2015">{{cite journal |last1=Keller |first1=Carmen |last2=Seigrist |first2=Michael |title=Does personality influence eating styles and food choices? Direct and indirect effects |journal=Appetite |date=January 2015 |volume=84 |pages=128–138 |doi=10.1016/j.appet.2014.10.003 |pmid=25308432 |s2cid=34628674}}</ref> Research into the ] of meat is relevant both to ] marketing<ref name=Richardson1994>{{cite journal |last=Richardson |first=N.J. |title=Consumer Perceptions of Meat |journal=Meat Science |year=1994 |volume=36 |issue=1–2 |pages=57–65 |doi=10.1016/0309-1740(94)90033-7 |pmid=22061452 |display-authors=etal}}</ref> and to those advocating eating less meat.<ref name="Klöckner 2014">{{cite journal |last1=Zur |first1=Ifat |last2=Klöckner |first2=Christian A. |title=Individual motivations for limiting meat consumption |journal=British Food Journal |volume=116 |issue=4 |year=2014 |pages=629–42 |doi=10.1108/bfj-08-2012-0193 }}</ref><ref name="Schösler">{{cite journal |last1=Schösler |first1=Hanna |last2=Boer |first2=Joop de |last3=Boersema |first3=Jan J. |title=Can we cut out the meat of the dish? Constructing consumer-oriented pathways towards meat substitution |journal=Appetite |volume=58 |issue=1 |year=2012 |pages=39–47 |doi=10.1016/j.appet.2011.09.009 |pmid=21983048 |s2cid=10495322 |url=https://research.vu.nl/en/publications/54385240-11c1-41fd-86a4-25c10ac6f23a }}</ref>

=== Gender ===

Unlike most other foods, meat is not perceived as ]; it is associated with men and ]. Sociological research, ranging from African tribal societies to contemporary ], indicates that men are much more likely to participate in preparing meat than other food.<ref name=Buscemi/> This has been attributed to the influence of traditional male ]s, in view of what ] calls a "male familiarity with killing", or as ] suggests, that ] (meat) is more violent than ] (grains and vegetables).<ref name=Buscemi/> By and large, at least in modern societies, men tend to consume more meat than women, and men often prefer ] whereas women tend to prefer chicken and fish.<ref name=Buscemi/>


== See also == == See also ==

{{Portal|Food|Agriculture and Agronomy}}
{{div col|colwidth=15em}} {{div col|colwidth=22em}}
<!-- Please keep links alphabetized --> <!-- Please keep links alphabetized, non-trivial, and relevant -->
* ]
* ] * ]
* ]
* ]
* ] * ]
* ] (also called gristle)
* ]
* ] * ]
* ]
* ]
* ]
* ]
* ]
* ]
* ] * ]
* ] * ]
* ] * ]
* ] * ]
* ]
* ]
{{div col end}} {{div col end}}


== References == == References ==

{{reflist|30em}}
{{reflist}}

== Sources ==

{{Free-content attribution
|title=World Food and Agriculture – Statistical Yearbook 2023
|author=FAO
|publisher=FAO
|documentURL=https://www.fao.org/documents/card/en?details=cc8166en
|license statement URL=https://commons.wikimedia.org/whttps://commons.wikimedia.org/File:World_Food_and_Agriculture_-_Statistical_Yearbook_2023.pdf
|license=CC BY-SA IGO 3.0
}}

* {{cite book |last1=Lawrie |first1=R.A. |last2=Ledward |first2=D. A. |title=Lawrie's meat science |publisher=Woodhead Publishing |location=Cambridge |year=2006 |edition=7th |isbn=978-1-84569-159-2}}


== External links == == External links ==

{{Commons category|Meats}} {{Commons category|Meats}}
{{Wikiquote}}
{{cookbook}} {{cookbook}}
{{Wikivoyage}} {{Wikivoyage}}
*{{Wiktionary-inline|meat}}
*
*
*
*


*
{{Meat}}
* {{Webarchive|url=https://web.archive.org/web/20181005091719/http://www.iarc.fr/en/media-centre/iarcnews/pdf/Monographs-Q%26A.pdf |date=October 5, 2018 }}
* {{Webarchive|url=https://web.archive.org/web/20181123082730/http://www.iarc.fr/en/media-centre/iarcnews/pdf/Monographs-Q%26A_Vol114.pdf |date=November 23, 2018 }}


{{Meat}}
{{Authority control}} {{Authority control}}


] ]
] ]
]
]

Latest revision as of 16:01, 4 January 2025

Animal flesh eaten as food

For other uses, see Meat (disambiguation).

Raw meat (clockwise from left): chicken, beef, bacon, pork chops

Meat is animal tissue, often muscle, that is eaten as food. Humans have hunted and farmed other animals for meat since prehistory. The Neolithic Revolution allowed the domestication of vertebrates, including chickens, sheep, goats, pigs, horses, and cattle, starting around 11,000 years ago. Since then, selective breeding has enabled farmers to produce meat with the qualities desired by producers and consumers.

Meat is mainly composed of water, protein, and fat. Its quality is affected by many factors, including the genetics, health, and nutritional status of the animal involved. Without preservation, bacteria and fungi decompose and spoil unprocessed meat within hours or days. Meat is edible raw, but it is normally eaten cooked, such as by stewing or roasting, or processed, such as by smoking or salting.

The consumption of meat (especially red and processed meat) increases the risk of certain negative health outcomes including cancer, coronary heart disease, and diabetes. Meat production is a major contributor to environmental issues including global warming, pollution, and biodiversity loss, at local and global scales. Meat is important to economies and cultures around the world, but some people (vegetarians and vegans) choose not to eat meat for ethical, environmental, health or religious reasons.

Etymology

The word meat comes from the Old English word mete, meaning food in general. In modern usage, meat primarily means skeletal muscle with its associated fat and connective tissue, but it can include offal, other edible organs such as liver and kidney. The term is sometimes used in a more restrictive sense to mean the flesh of mammalian species (pigs, cattle, sheep, goats, etc.) raised and prepared for human consumption, to the exclusion of fish, other seafood, insects, poultry, or other animals.

History

Further information: History of agriculture

Domestication

Further information: Domestication

Paleontological evidence suggests that meat constituted a substantial proportion of the diet of the earliest humans. Early hunter-gatherers depended on the organized hunting of large animals such as bison and deer. Animals were domesticated in the Neolithic, enabling the systematic production of meat and the breeding of animals to improve meat production.

Major animal domestications
Animal Centre of origin Purpose Date/years ago
Goat, sheep, pig, cow Near East, South Asia Food 11,000–10,000
Chicken East Asia Cockfighting 7,000
Horse Central Asia Draft, riding 5,500

Intensive animal farming

Further information: Intensive animal farming

In the postwar period, governments gave farmers guaranteed prices to increase animal production. The effect was to raise output at the cost of increased inputs such as of animal feed and veterinary medicines, as well as of animal disease and environmental pollution. In 1966, the United States, the United Kingdom and other industrialized nations, began factory farming of beef and dairy cattle and domestic pigs. Intensive animal farming became globalized in the later years of the 20th century, replacing traditional stock rearing in countries around the world. In 1990 intensive animal farming accounted for 30% of world meat production and by 2005, this had risen to 40%.

Selective breeding

Modern agriculture employs techniques such as progeny testing to speed selective breeding, allowing the rapid acquisition of the qualities desired by meat producers. For instance, in the wake of well-publicized health concerns associated with saturated fats in the 1980s, the fat content of United Kingdom beef, pork and lamb fell from 20–26 percent to 4–8 percent within a few decades, due to both selective breeding for leanness and changed methods of butchery. Methods of genetic engineering that could improve the meat-producing qualities of animals are becoming available.

Meat production continues to be shaped by the demands of customers. The trend towards selling meat in pre-packaged cuts has increased the demand for larger breeds of cattle, better suited to producing such cuts. Animals not previously exploited for their meat are now being farmed, including mammals such as antelope, zebra, water buffalo and camel, as well as non-mammals, such as crocodile, emu and ostrich. Organic farming supports an increasing demand for meat produced to that standard.

  • A shoulder of lamb A shoulder of lamb
  • A Hereford bull, a breed of beef cattle A Hereford bull, a breed of beef cattle
  • Supermarket meat, North America Supermarket meat, North America

Animal growth and development

Several factors affect the growth and development of meat.

Genetics

Trait Heritability
Reproductive efficiency 2–10%
Meat quality 15–30%
Growth 20–40%
Muscle/fat ratio 40–60%

Some economically important traits in meat animals are heritable to some degree, and can thus be selected for by animal breeding. In cattle, certain growth features are controlled by recessive genes which have not so far been controlled, complicating breeding. One such trait is dwarfism; another is the doppelender or "double muscling" condition, which causes muscle hypertrophy and thereby increases the animal's commercial value. Genetic analysis continues to reveal the genetic mechanisms that control numerous aspects of the endocrine system and, through it, meat growth and quality.

Genetic engineering techniques can shorten breeding programs significantly because they allow for the identification and isolation of genes coding for desired traits, and for the reincorporation of these genes into the animal genome. To enable such manipulation, the genomes of many animals are being mapped. Some research has already seen commercial application. For instance, a recombinant bacterium has been developed which improves the digestion of grass in the rumen of cattle, and some specific features of muscle fibers have been genetically altered. Experimental reproductive cloning of commercially important meat animals such as sheep, pig or cattle has been successful. Multiple asexual reproduction of animals bearing desirable traits is anticipated.

Environment

Heat regulation in livestock is of economic significance, as mammals attempt to maintain a constant optimal body temperature. Low temperatures tend to prolong animal development and high temperatures tend to delay it. Depending on their size, body shape and insulation through tissue and fur, some animals have a relatively narrow zone of temperature tolerance and others (e.g. cattle) a broad one. Static magnetic fields, for reasons still unknown, retard animal development.

Animal nutrition

The quality and quantity of usable meat depends on the animal's plane of nutrition, i.e., whether it is over- or underfed. Scientists disagree about how exactly the plane of nutrition influences carcase composition.

The composition of the diet, especially the amount of protein provided, is an important factor regulating animal growth. Ruminants, which may digest cellulose, are better adapted to poor-quality diets, but their ruminal microorganisms degrade high-quality protein if supplied in excess. Because producing high-quality protein animal feed is expensive, several techniques are employed or experimented with to ensure maximum utilization of protein. These include the treatment of feed with formalin to protect amino acids during their passage through the rumen, the recycling of manure by feeding it back to cattle mixed with feed concentrates, or the conversion of petroleum hydrocarbons to protein through microbial action.

In plant feed, environmental factors influence the availability of crucial nutrients or micronutrients, a lack or excess of which can cause a great many ailments. In Australia, where the soil contains limited phosphate, cattle are fed additional phosphate to increase the efficiency of beef production. Also in Australia, cattle and sheep in certain areas were often found losing their appetite and dying in the midst of rich pasture; this was found to be a result of cobalt deficiency in the soil. Plant toxins are a risk to grazing animals; for instance, sodium fluoroacetate, found in some African and Australian plants, kills by disrupting the cellular metabolism. Some man-made pollutants such as methylmercury and some pesticide residues present a particular hazard as they bioaccumulate in meat, potentially poisoning consumers.

Animal welfare

See also: Animal welfare labelling
The welfare of farm animals such as hens in battery cages and other systems is debated.

Practices such as confinement in factory farming have generated concerns for animal welfare. Animals have abnormal behaviors such as tail-biting, cannibalism, and feather pecking. Invasive procedures such as beak trimming, castration, and ear notching have similarly been questioned. Breeding for high productivity may affect welfare, as when broiler chickens are bred to be very large and to grow rapidly. Broilers often have leg deformities and become lame, and many die from the stress of handling and transport.

Human intervention

Meat producers may seek to improve the fertility of female animals through the administration of gonadotrophic or ovulation-inducing hormones. In pig production, sow infertility is a common problem – possibly due to excessive fatness. No methods currently exist to augment the fertility of male animals. Artificial insemination is now routinely used to produce animals of the best possible genetic quality, and the efficiency of this method is improved through the administration of hormones that synchronize the ovulation cycles within groups of females.

Growth hormones, particularly anabolic agents such as steroids, are used in some countries to accelerate muscle growth in animals. This practice has given rise to the beef hormone controversy, an international trade dispute. It may decrease the tenderness of meat, although research on this is inconclusive, and have other effects on the composition of the muscle flesh. Where castration is used to improve control over male animals, its side effects can be counteracted by the administration of hormones. Myostatin has been used to produce muscle hypertrophy.

Sedatives may be administered to animals to counteract stress factors and increase weight gain. The feeding of antibiotics to certain animals increases growth rates. This practice is particularly prevalent in the US, but has been banned in the EU, partly because it causes antimicrobial resistance in pathogenic microorganisms.

Composition

Biochemical

The biochemical composition of meat varies in complex ways depending on the species, breed, sex, age, plane of nutrition, training and exercise of the animal, as well as on the anatomical location of the musculature involved. Even between animals of the same litter and sex there are considerable differences in such parameters as the percentage of intramuscular fat.

Adult mammalian muscle consists of roughly 75 percent water, 19 percent protein, 2.5 percent intramuscular fat, 1.2 percent carbohydrates and 2.3 percent other soluble substances. These include organic compounds, especially amino acids, and inorganic substances such as minerals. Muscle proteins are either soluble in water (sarcoplasmic proteins, about 11.5 percent of total muscle mass) or in concentrated salt solutions (myofibrillar proteins, about 5.5 percent of mass). There are several hundred sarcoplasmic proteins. Most of them – the glycolytic enzymes – are involved in glycolysis, the conversion of sugars into high-energy molecules, especially adenosine triphosphate (ATP). The two most abundant myofibrillar proteins, myosin and actin, form the muscle's overall structure and enable it to deliver power, consuming ATP in the process. The remaining protein mass includes connective tissue (collagen and elastin). Fat in meat can be either adipose tissue, used by the animal to store energy and consisting of "true fats" (esters of glycerol with fatty acids), or intramuscular fat, which contains phospholipids and cholesterol.

Meat can be broadly classified as "red" or "white" depending on the concentration of myoglobin in muscle fiber. When myoglobin is exposed to oxygen, reddish oxymyoglobin develops, making myoglobin-rich meat appear red. The redness of meat depends on species, animal age, and fiber type: Red meat contains more narrow muscle fibers that tend to operate over long periods without rest, while white meat contains more broad fibers that tend to work in short fast bursts, such as the brief flight of the chicken. The meat of adult mammals such as cows, sheep, and horses is considered red, while chicken and turkey breast meat is considered white.

  • "Red" meat: beef steak "Red" meat:
    beef steak
  • "White" meat: chicken breast (flight muscle) "White" meat:
    chicken breast (flight muscle)

Nutritional

Muscle tissue is high in protein, containing all of the essential amino acids, and in most cases is a good source of zinc, vitamin B12, selenium, phosphorus, niacin, vitamin B6, choline, riboflavin and iron. Several forms of meat are high in vitamin K. Muscle tissue is very low in carbohydrates and does not contain dietary fiber.

The fat content of meat varies widely with the species and breed of animal, the way in which the animal was raised, what it was fed, the part of the body, and the methods of butchering and cooking. Wild animals such as deer are leaner than farm animals, leading those concerned about fat content to choose game such as venison. Decades of breeding meat animals for fatness is being reversed by consumer demand for leaner meat. The fatty deposits near the muscle fibers in meats soften meat when it is cooked, improve its flavor, and make the meat seem juicier. Fat around meat further contains cholesterol. The increase in meat consumption after 1960 is associated with significant imbalances of fat and cholesterol in the human diet.

Nutritional content of 110 g (1⁄4 lb); data vary widely with selection (e.g. skinless, boneless) and preparation
Source Energy: kJ (kcal) Protein Carbs Fat
Chicken breast 490 (117) 25 g 0 g 2 g
Lamb mince 1,330 (319) 19 g 0 g 26 g
Beef mince 1,200 (287) 19 g 0 g 22 g
Dog 1,100 (270) 20 g 0 g 22 g
Horse 610 (146) 23 g 0 g 5 g
Pork loin 1,010 (242) 14 g 0 g 30 g
Rabbit 900 (215) 32 g 0 g 9 g

Production

Further information: Meat industry and Meat-packing industry
  • World production of meat, main items World production of meat, main items
  • World production of main meat items, main producers (2019) World production of main meat items, main producers (2019)
Land Animals Killed for Meat, 2013
Animals Number Killed
Chickens 61,171,973,510
Ducks 2,887,594,480
Pigs 1,451,856,889
Rabbits 1,171,578,000
Geese 687,147,000
Turkeys 618,086,890
Sheep 536,742,256
Goats 438,320,370
Cattle 298,799,160
Rodents 70,371,000
Other birds 59,656,000
Buffalo 25,798,819
Horses 4,863,367
Donkeys, mules 3,478,300
Camelids 3,298,266

Biomass of mammals on Earth

  Livestock, mostly cattle and pigs (60%)  Humans (36%)  Wild mammals (4%)

Transport

Upon reaching a predetermined age or weight, livestock are usually transported en masse to the slaughterhouse. Depending on its length and circumstances, this may exert stress and injuries on the animals, and some may die en route. Unnecessary stress in transport may adversely affect the quality of the meat. In particular, the muscles of stressed animals are low in water and glycogen, and their pH fails to attain acidic values, all of which results in poor meat quality.

Slaughter

See also: Animal slaughter and Meat industry

Animals are usually slaughtered by being first stunned and then exsanguinated (bled out). Death results from the one or the other procedure, depending on the methods employed. Stunning can be effected through asphyxiating the animals with carbon dioxide, shooting them with a gun or a captive bolt pistol, or shocking them with electric current. The exsanguination is accomplished by severing the carotid artery and the jugular vein in cattle and sheep, and the anterior vena cava in pigs. Draining as much blood as possible from the carcass is necessary because blood causes the meat to have an unappealing appearance and is a breeding ground for microorganisms.

Dressing and cutting

After exsanguination, the carcass is dressed; that is, the head, feet, hide (except hogs and some veal), excess fat, viscera and offal are removed, leaving only bones and edible muscle. Cattle and pig carcases, but not those of sheep, are then split in half along the mid ventral axis, and the carcase is cut into wholesale pieces. The dressing and cutting sequence, long a province of manual labor, is being progressively automated.

Conditioning

Under hygienic conditions and without other treatment, meat can be stored at above its freezing point (−1.5 °C) for about six weeks without spoilage, during which time it undergoes an aging process that increases its tenderness and flavor. During the first day after death, glycolysis continues until the accumulation of lactic acid causes the pH to reach about 5.5. The remaining glycogen, about 18 g per kg, increases the water-holding capacity and tenderness of cooked meat.

Rigor mortis sets in a few hours after death as adenosine triphosphate is used up. This causes the muscle proteins actin and myosin to combine into rigid actomyosin. This in turn lowers the meat's water-holding capacity, so the meat loses water or "weeps". In muscles that enter rigor in a contracted position, actin and myosin filaments overlap and cross-bond, resulting in meat that becomes tough when cooked. Over time, muscle proteins denature in varying degree, with the exception of the collagen and elastin of connective tissue, and rigor mortis resolves. These changes mean that meat is tender and pliable when cooked just after death or after the resolution of rigor, but tough when cooked during rigor.

As the muscle pigment myoglobin denatures, its iron oxidizes, which may cause a brown discoloration near the surface of the meat. Ongoing proteolysis contributes to conditioning: hypoxanthine, a breakdown product of ATP, contributes to meat's flavor and odor, as do other products of the decomposition of muscle fat and protein.

Additives

Further information: Meat spoilage and Meat preservation

When meat is industrially processed, additives are used to protect or modify its flavor or color, to improve its tenderness, juiciness or cohesiveness, or to aid with its preservation.

Additives used in industrial meat processing
Additive Examples Function Notes
Salt n/a Imparts flavor, inhibits microbial growth, extends the product's shelf life and helps emulsifying finely processed products, such as sausages. The most common additive. Ready-to-eat meat products often contain 1.5 to 2.5 percent salt.
Nitrite n/a Curing meat, to stabilize color and flavor, and inhibit growth of spore-forming microorganisms such as Clostridium botulinum. The use of nitrite's precursor nitrate is now limited to a few products such as dry sausage, prosciutto or parma ham.
Alkaline polyphosphates Sodium tripolyphosphate Increase the water-binding and emulsifying ability of meat proteins, limit lipid oxidation and flavor loss, and reduce microbial growth.
Ascorbic acid (vitamin C) n/a Stabilize the color of cured meat.
Sweeteners Sugar, corn syrup Impart a sweet flavor, bind water and assist surface browning during cooking in the Maillard reaction.
Seasonings Spices, herbs, essential oils Impart or modify flavor.
Flavorings Monosodium glutamate Strengthen existing flavors.
Tenderizers Proteolytic enzymes, acids Break down collagen to make the meat more palatable for consumption.
Antimicrobials lactic, citric and acetic acid, calcium sulfate, cetylpyridinium chloride, lactoferrin, bacteriocins such as nisin. Limit growth of meat spoilage bacteria
Antioxidants Limit lipid oxidation, which would create an undesirable "off flavor". Used in precooked meat products.
Acidifiers Lactic acid, citric acid Impart a tangy or tart flavor note, extend shelf-life, tenderize fresh meat or help with protein denaturation and moisture release in dried meat. They substitute for the process of natural fermentation that acidifies some meat products such as hard salami or prosciutto.

Consumption

Historical

A bioarchaeological (specifically, isotopic analysis) study of early medieval England found, based on the funerary record, that high-meat protein diets were extremely rare, and that (contrary to previously held assumptions) elites did not consume more meat than non-elites, and men did not consume more meat than women.

In the nineteenth century, meat consumption in Britain was the highest in Europe, exceeded only by that in British colonies. In the 1830s consumption per head in Britain was about 34 kilograms (75 lb) a year, rising to 59 kilograms (130 lb) in 1912. In 1904, laborers consumed 39 kilograms (87 lb) a year while aristocrats ate 140 kilograms (300 lb). There were some 43,000 butcher's shops in Britain in 1910, with "possibly more money invested in the meat industry than in any other British business" except finance. The US was a meat importing country by 1926.

Truncated lifespan as a result of intensive breeding allows more meat to be produced from fewer animals. The world cattle population was about 600 million in 1929, with 700 million sheep and goats and 300 million pigs.

Trends

Further information: List of countries by meat consumption and List of countries by meat production While meat consumption in most industrialized countries is at high, stable levels...... it is rising in emerging economies. Per capita annual meat consumption by regionTotal annual meat consumption by regionTotal annual meat consumption by type of meat

According to the Food and Agriculture Organization, the overall consumption for white meat has increased from the 20th to the 21st centuries. Poultry meat has increased by 76.6% per kilo per capita and pig meat by 19.7%. Bovine meat has decreased from 10.4 kg (22 lb 15 oz) per capita in 1990 to 9.6 kg (21 lb 3 oz) per capita in 2009. FAO analysis found that 357 million tonnes of meat were produced in 2021, 53% more than in 2000, with chicken meat representing more than half the increase.

Overall, diets that include meat are the most common worldwide according to the results of a 2018 Ipsos MORI study of 16–64 years olds in 28 countries. Ipsos states "An omnivorous diet is the most common diet globally, with non-meat diets (which can include fish) followed by over a tenth of the global population." Approximately 87% of people include meat in their diet in some frequency. 73% of meat eaters included it in their diet regularly and 14% consumed meat only occasionally or infrequently. Estimates of the non-meat diets were analysed. About 3% of people followed vegan diets, where consumption of meat, eggs, and dairy are abstained from. About 5% of people followed vegetarian diets, where consumption of meat is abstained from, but egg and/or dairy consumption is not strictly restricted. About 3% of people followed pescetarian diets, where consumption of the meat of land animals is abstained from, fish meat and other seafood is consumed, and egg and/or dairy consumption may or may not be strictly restricted.

The type of meat consumed varies between different cultures. The amount and kind of meat consumed varies by income, both between countries and within a given country. Horses are commonly eaten in countries such as France, Italy, Germany and Japan. Horses and other large mammals such as reindeer were hunted during the late Paleolithic in western Europe. Dogs are consumed in China, South Korea and Vietnam. Dogs are occasionally eaten in the Arctic regions. Historically, dog meat has been consumed in various parts of the world, such as Hawaii, Japan, Switzerland and Mexico. Cats are sometimes eaten, such as in Peru. Guinea pigs are raised for their flesh in the Andes. Whales and dolphins are hunted, partly for their flesh, in several countries. Misidentification is a risk; in 2013, products in Europe labelled as beef actually contained horse meat.

Methods of preparation

Meat can be cooked in many ways, including braising, broiling, frying, grilling, and roasting. Meat can be cured by smoking, which preserves and flavors food by exposing it to smoke from burning or smoldering wood. Other methods of curing include pickling, salting, and air-drying. Some recipes call for raw meat; steak tartare is made from minced raw beef. Pâtés are made with ground meat and fat, often including liver.

Health effects

Further information: Red meat § Health effects

Meat, in particular red and processed meat, is linked to a variety of health risks. The 2015–2020 Dietary Guidelines for Americans asked men and teenage boys to increase their consumption of vegetables or other underconsumed foods (fruits, whole grains, and dairy) while reducing intake of protein foods (meats, poultry, and eggs) that they currently overconsume.

Contamination

Toxic compounds including heavy metals, mycotoxins, pesticide residues, dioxins, polychlorinated biphenyl can contaminate meat. Processed, smoked and cooked meat may contain carcinogens such as polycyclic aromatic hydrocarbons. Toxins may be introduced to meat as part of animal feed, as veterinary drug residues, or during processing and cooking. Such compounds are often metabolized in the body to form harmful by-products. Negative effects depend on the individual genome, diet, and history of the consumer.

Cancer

Main article: Red meat § Cancer

The consumption of processed and red meat carries an increased risk of cancer. The International Agency for Research on Cancer (IARC), a specialized agency of the World Health Organization (WHO), classified processed meat (e.g., bacon, ham, hot dogs, sausages) as, "carcinogenic to humans (Group 1), based on sufficient evidence in humans that the consumption of processed meat causes colorectal cancer." IARC classified red meat as "probably carcinogenic to humans (Group 2A), based on limited evidence that the consumption of red meat causes cancer in humans and strong mechanistic evidence supporting a carcinogenic effect."

Cancer Research UK, National Health Service (NHS) and the National Cancer Institute have stated that red and processed meat intake increases risk of bowel cancer. The American Cancer Society in their "Diet and Physical Activity Guideline", stated "evidence that red and processed meats increase cancer risk has existed for decades, and many health organizations recommend limiting or avoiding these foods." The Canadian Cancer Society have stated that "eating red and processed meat increases cancer risk".

A 2021 review found an increase of 11–51% risk of multiple cancer per 100g/d increment of red meat, and an increase of 8–72% risk of multiple cancer per 50g/d increment of processed meat.

Cooking muscle meat creates heterocyclic amines (HCAs), which are thought to increase cancer risk in humans. Researchers at the National Cancer Institute published results of a study which found that human subjects who ate beef rare or medium-rare had less than one third the risk of stomach cancer than those who ate beef medium-well or well-done. While eating muscle meat raw may be the only way to avoid HCAs fully, the National Cancer Institute states that cooking meat below 100 °C (212 °F) creates "negligible amounts" of HCAs. Microwaving meat before cooking may reduce HCAs by 90%. Nitrosamines, present in processed and cooked foods, are carcinogenic, being linked to colon cancer. Polycyclic aromatic hydrocarbons, present in processed, smoked and cooked foods, are similarly carcinogenic.

Bacterial contamination

Bacterial contamination has been seen with meat products. A 2011 study by the Translational Genomics Research Institute showed that nearly half (47%) of the meat and poultry in U.S. grocery stores were contaminated with S. aureus, with more than half (52%) of those bacteria resistant to antibiotics. A 2018 investigation by the Bureau of Investigative Journalism and The Guardian found that around 15 percent of the US population suffers from foodborne illnesses every year. The investigation highlighted unsanitary conditions in US-based meat plants, which included meat products covered in excrement and abscesses "filled with pus".

Complete cooking and the careful avoidance of recontamination reduce the risk of bacterial infections from meat.

Diabetes

Consumption of 100 g/day of red meat and 50 g/day of processed meat is associated with an increased risk of diabetes.

Diabetes UK advises people to limit their intake of red and processed meat.

Infectious diseases

Meat production and trade substantially increase risks for infectious diseases (zoonosis), including of pandemics, whether though contact with wild and farmed animals, or via husbandry's environmental impact. For example, avian influenza from poultry meat production is a threat to human health. Furthermore, the use of antibiotics in meat production contributes to antimicrobial resistance – which contributes to millions of deaths – and makes it harder to control infectious diseases.

Changes in consumer behavior

In response to changing meat prices as well as health concerns about saturated fat and cholesterol, consumers have altered their consumption of various meats. Consumption of beef in the United States between 1970 and 1974 and 1990–1994 dropped by 21%, while consumption of chicken increased by 90%.

Heart disease

Risk of ischemic heart disease for each 50 g per day increase in processed meat consumption

Except for poultry, at 50 g/day unprocessed red and processed meat are risk factors for ischemic heart disease, increasing the risk by about 9 and 18% respectively.

Environmental impact

Further information: Environmental impacts of animal agriculture

A multitude of serious negative environmental effects are associated with meat production. Among these are greenhouse gas emissions, fossil energy use, water use, water quality changes, and effects on grazed ecosystems. They are so significant that according to University of Oxford researchers, "a vegan diet is probably the single biggest way to reduce your impact on planet Earth... far bigger than cutting down on your flights or buying an electric car". However, this is often ignored in the public consciousness and in plans to tackle serious environmental issues such as the climate crisis.

The livestock sector may be the largest source of water pollution (due to animal wastes, fertilizers, pesticides), and it contributes to emergence of antibiotic resistance. It accounts for over 8% of global human water use. It is a significant driver of biodiversity loss and ecosystems, as it causes deforestation, ocean dead zones, species extinction, land degradation, pollution, overfishing and global warming. Cattle farming was estimated to be responsible for 80 per cent of Amazon deforestation in 2008 due to the clearing of forests to grow animal feed (especially soya) and cattle ranching.

Environmental effects vary among livestock production systems. Grazing of livestock can be beneficial for some wildlife species, but not for others. Targeted grazing of livestock is used as a food-producing alternative to herbicide use in some vegetation management.

Land use

Cereal-use statistic showing an estimated large fraction of crops used as animal feed (red)
Meat production is a main driver of tropical deforestation, in the Amazon largely due to beef production for export.

Meat production is by far the biggest user of land, as it accounts for nearly 40% of the global land surface. Just in the contiguous United States, 34% of its land area (265 million hectares or 654 million acres) are used as pasture and rangeland, mostly feeding livestock, not counting 158 million hectares (391 million acres) of cropland (20%), some of which is used for producing feed for livestock. Roughly 75% of deforested land around the globe is used for livestock pasture. Deforestation from practices like slash-and-burn releases CO2 and removes the carbon sink of grown tropical forest ecosystems which substantially mitigate climate change. Land use is a major pressure on pressure on fertile soils which is important for global food security.

Climate change

See also: Livestock's Long Shadow
Life-cycle assessment of GHG emissions for foods. Beef is the food with the largest carbon footprint, mainly due to methane production from cows.

The rising global consumption of carbon-intensive meat products has "exploded the global carbon footprint of agriculture," according to some top scientists. Meat production is responsible for some 35% of global emissions of greenhouse gases, and 60% of the greenhouse gases attributable to food production.

Some nations show very different impacts to counterparts within the same group, with Brazil and Australia having emissions over 200% higher than the average of their respective income groups, driven by meat consumption.

According to the Assessing the Environmental Impacts of Consumption and Production report produced by United Nations Environment Programme's (UNEP) international panel for sustainable resource management, a worldwide transition in the direction of a meat and dairy free diet is indispensable if adverse global climate change were to be prevented. A 2019 report in The Lancet recommended that global meat (and sugar) consumption be reduced by 50 percent to mitigate climate change. Meat consumption in Western societies needs to be reduced by up to 90% according to a 2018 study published in Nature. The 2019 special report by the Intergovernmental Panel on Climate Change called for significantly reducing meat consumption, particularly in wealthy countries, in order to mitigate and adapt to climate change.

Biodiversity loss

Meat consumption is a primary contributor to the sixth mass extinction. A 2017 study by the World Wildlife Fund found that 60% of global biodiversity loss is attributable to meat-based diets, in particular from the use of land for feed crops, resulting in large-scale loss of habitats and species. Livestock make up 60% of the biomass of all mammals on earth, followed by humans (36%) and wild mammals (4%). In November 2017, 15,364 world scientists signed a Warning to Humanity calling for a drastic reduction in per capita consumption of meat and "dietary shifts towards mostly plant-based foods". The 2019 Global Assessment Report on Biodiversity and Ecosystem Services recommended a reduction in meat consumption to mitigate biodiversity loss. A 2021 Chatham House report asserted that a shift towards plant-based diets would free up land for the restoration of ecosystems and biodiversity.

Meat consumption is predicted to rise as the human population increases and becomes more affluent; this in turn would increase greenhouse gas emissions and further reduce biodiversity.

Reducing environmental impact

The environmental impact of meat production can be reduced on the farm by conversion of human-inedible residues of food crops. Manure from meat-producing livestock is used as fertilizer; it may be composted before application to food crops. Substitution of animal manures for synthetic fertilizers in crop production can be environmentally significant, as between 43 and 88 MJ of fossil fuel energy are used per kg of nitrogen in manufacture of synthetic nitrogenous fertilizers.

Reducing meat consumption

Main article: Sustainable consumption § Sustainable food consumption

The IPCC and others have stated that meat production has to be reduced substantially for any sufficient mitigation of climate change and, at least initially, largely through shifts towards plant-based diets where meat consumption is high. Personal carbon allowances that allow a certain amount of free meat consumption per person would be a form of restriction, meat taxes would be a type of fiscal mechanism. Meat can be replaced by, for example, high-protein iron-rich low-emission legumes and common fungi, dietary supplements (e.g. of vitamin B12 and zinc) and fortified foods, cultured meat, microbial foods, mycoprotein, meat substitutes, and other alternatives, such as those based on mushrooms, legumes (pulses), and other food sources. Land previously used for meat production can be rewilded. The biologists Rodolfo Dirzo, Gerardo Ceballos, and Paul R. Ehrlich state that it is the "massive planetary monopoly of industrial meat production that needs to be curbed" while respecting the cultural traditions of indigenous peoples, for whom meat is an important source of protein.

Cultural aspects

Meat is part of the human diet in most cultures, where it often has symbolic meaning and important social functions.

Ethical issues

Main article: Ethics of eating meat

Ethical issues regarding the consumption of meat include objecting to the act of killing animals or to the agricultural practices used in meat production. Reasons for objecting to killing animals for consumption may include animal rights, environmental ethics, or an aversion to inflicting pain or harm on sentient animals. Some people, while not vegetarians, refuse to eat the flesh of certain animals for cultural or religious reasons.

The founders of Western philosophy disagreed about the ethics of eating meat. Plato's Republic has Socrates describe the ideal state as vegetarian. Pythagoras believed that humans and animals were equal and therefore disapproved of meat consumption, as did Plutarch, whereas Zeno and Epicurus were vegetarian but allowed meat-eating in their philosophy. Conversely, Aristotle's Politics assert that animals, as inferior beings, exist to serve humans, including as food. Augustine drew on Aristotle to argue that the universe's natural hierarchy allows humans to eat animals, and animals to eat plants. Enlightenment philosophers were likewise divided. Descartes wrote that animals were merely animated machines, while Kant considered them inferior beings for lack of discernment: means rather than ends. But Voltaire and Rousseau disagreed; Rousseau argued that meat-eating is a social rather than a natural act, because children are not interested in meat.

Later philosophers examined the changing practices of eating meat in the modern age as part of a process of detachment from animals as living beings. Norbert Elias, for instance, noted that in medieval times cooked animals were brought to the table whole, but that since the Renaissance only the edible parts are served, which are no longer recognizably part of an animal. Modern eaters, according to Noëlie Vialles, demand an "ellipsis" between meat and dead animals; for instance, calves' eyes are no longer considered a delicacy as in the Middle Ages, but provoke disgust. Fernand Braudel wrote that since the European diet of the 15th and 16th century was particularly heavy in meat, European colonialism helped export meat-eating across the globe, as colonized peoples took up the culinary habits of their colonizers, which they associated with wealth and power.

Religious traditions

Main article: Vegetarianism and religion
Catholic nuns buying meat in Italy

Among the Indian religions, Jainism opposes the eating of meat, while some schools of Buddhism and Hinduism advocate but do not mandate vegetarianism. Jewish Kashrut dietary rules allow certain (kosher) meat and forbid other (treif) meat. The rules prohibit the consumption of unclean animals such as pork, and mixtures of meat and milk. Similar rules apply in Islamic dietary laws: The Quran explicitly forbids meat from animals that die naturally, blood, and the meat of pigs, which are haram, forbidden, as opposed to halal, allowed. Some Sikh groups oppose eating any meat.

Psychology

Main article: Psychology of eating meat

Research in applied psychology has investigated meat eating in relation to morality, emotions, cognition, and personality. Psychological research suggests meat eating is correlated with masculinity, and reduced openness to experience. Research into the consumer psychology of meat is relevant both to meat industry marketing and to those advocating eating less meat.

Gender

Unlike most other foods, meat is not perceived as gender-neutral; it is associated with men and masculinity. Sociological research, ranging from African tribal societies to contemporary barbecue, indicates that men are much more likely to participate in preparing meat than other food. This has been attributed to the influence of traditional male gender roles, in view of what Jack Goody calls a "male familiarity with killing", or as Claude Lévi-Strauss suggests, that roasting (meat) is more violent than boiling (grains and vegetables). By and large, at least in modern societies, men tend to consume more meat than women, and men often prefer red meat whereas women tend to prefer chicken and fish.

See also

References

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Sources

 This article incorporates text from a free content work. Licensed under CC BY-SA IGO 3.0 (license statement/permission). Text taken from World Food and Agriculture – Statistical Yearbook 2023​, FAO, FAO.

  • Lawrie, R.A.; Ledward, D. A. (2006). Lawrie's meat science (7th ed.). Cambridge: Woodhead Publishing. ISBN 978-1-84569-159-2.

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