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{{Short description|Preparing food using heat}} | |||
'''Cooking''' is the act of preparing ] for consumption. The term is often used in the narrower sense of applying heat to chemically transform a food to change its flavor, texture, appearance, or nutritional properties. When humans mastered ] thousands of years ago, cooking became a widespread cultural feature. Cooking often is the method used to improve the flavour of foods using combinations of ingredients to provide the most pleasing taste. | |||
{{About|the preparation of food specifically via heat|a general outline|Outline of food preparation|varied styles of international food|Cuisine}} | |||
{{Distinguish|Coking}} | |||
{{pp-pc|small=yes}} | |||
{{Use dmy dates|date=May 2021}} | |||
] kitchen, ]]] | |||
== Effects of cooking == | |||
'''Cooking''', also known as '''cookery''' or professionally as the '''culinary arts''', is the art, ] and craft of using ] to make ] more ], ], ], or ]. Cooking techniques and ingredients vary widely, from grilling food over an open ], to using ]s, to ] in various types of ]s, reflecting local conditions. Cooking is an aspect of all human societies and a ]. | |||
Heating can disinfect the food (depending on temperature, cooking time, and technique used), in addition to softening the food by turning ] into ]. 45 to 140°F (or the roughly equivalent range 5 to 60°C) is the "danger zone" in which many food spoilage bacteria thrive, and which must be avoided for safe handling of meat, poultry and dairy products. Refrigeration and freezing do not kill bacteria, but slow their growth. | |||
Types of cooking also depend on the skill levels and training of the ]. Cooking is done both by people in their own dwellings and by professional cooks and ]s in ]s and other food establishments. | |||
] adherents advise against the use of heat in the preparation of food: they believe that temperatures above 106°F (41°C) destroy essential ]s in the food, which they believe are necessary for proper digestion and nutrition. | |||
Preparing food with heat or fire is an activity unique to ]s. Archeological evidence of cooking fires from at least 300,000 years ago exists, but some estimate that humans started cooking up to 2 million years ago.<ref>{{Cite web|url=https://www.nationalgeographic.com/people-and-culture/food/the-plate/2015/09/02/a-brief-history-of-cooking-with-fire/|archive-url=https://web.archive.org/web/20190325112804/https://www.nationalgeographic.com/people-and-culture/food/the-plate/2015/09/02/a-brief-history-of-cooking-with-fire/|url-status=dead|archive-date=25 March 2019|title=A Brief History of Cooking With Fire|last=Rupp|first=Rebecca|date=2015-09-02|website=National Geographic|access-date=2019-05-29}}</ref><ref>{{cite book |last1=Wrangham |first1=Richard |title=Catching Fire: How cooking made us human |date=2009}}</ref> | |||
== Cooking techniques == <!-- Please help keep lists alphabetized --> | |||
The expansion of ], ], ], and ]ation between ]s in different regions offered cooks many new ingredients. New inventions and technologies, such as the invention of ] for holding and ] of ], expanded cooking techniques. Some modern cooks apply advanced ] techniques to food preparation to further enhance the ] of the dish served.<ref>{{cite journal |title=A New Spin on Cooking |journal=Scientific American |volume=304 |issue=3 |pages=23 |author1=W. Wayt Gibbs |author2=Nathan Myhrvold |bibcode=2011SciAm.304c..23G |year=2011 |doi=10.1038/scientificamerican0311-23a |pmid = 21438483}}</ref> | |||
Some major hot cooking techniques: | |||
==History== | |||
* ] | |||
]s being heated with a ] fire in ]]] | |||
** ] | |||
] suggests that early hominids may have adopted cooking 1 million to 2 million years ago.<ref name=PNAS>{{cite journal| title=Phylogenetic rate shifts in feeding time during the evolution of Homo | first=Chris | last=Organ | journal= ] | date=22 August 2011 | doi=10.1073/pnas.1107806108 | pmid=21873223 | pmc=3167533 | volume=108 | issue=35 | pages=14555–14559| bibcode=2011PNAS..10814555O | doi-access=free }}</ref> {{Nowrap|Re-analysis}} of burnt bone fragments and plant ashes from the ] in South Africa has provided evidence supporting ] 1 million years ago.<ref name=Pringle2012>{{citation |date=2 April 2012 |author=Pringle, Heather |title=Quest for Fire Began Earlier Than Thought |journal=ScienceNOW |url=http://news.sciencemag.org/sciencenow/2012/04/quest-for-fire-began-earlier-tha.html?ref=em |archive-url=https://archive.today/20130415203914/http://news.sciencemag.org/sciencenow/2012/04/quest-for-fire-began-earlier-tha.html?ref=em |url-status=dead |archive-date=15 April 2013 |access-date=2012-04-04 }}</ref> In his seminal work '']'', ] suggested that evolution of bipedalism and a large cranial capacity meant that early '']'' regularly cooked food.<ref>Wrangham, R. and Conklin-Brittain, N., 2003. Cooking as a biological trait. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 136(1), pp. 35–46</ref><ref name="pollard">{{Cite book |title=Worlds Together, Worlds Apart |last=Pollard |first=Elizabeth |publisher=Norton |year=2015|isbn=978-0-393-92207-3 |location=New York |pages=13}}</ref> However, unequivocal evidence in the archaeological record for the controlled use of fire begins at 400,000 BCE, long after '']''.<ref name="Luke">{{cite web|url=https://www.sciencedaily.com/releases/2012/04/120402162548.htm|title=Evidence That Human Ancestors Used Fire One Million Years Ago|access-date=2013-10-27|last=Luke|first=Kim|quote=An international team led by the University of Toronto and Hebrew University has identified the earliest known evidence of the use of fire by human ancestors. Microscopic traces of wood ash, alongside animal bones and stone tools, were found in a layer dated to one million years ago}}</ref><ref name="discovermagazine.com">{{Cite web|url=http://discovermagazine.com/2013/may/09-archaeologists-find-earliest-evidence-of-humans-cooking-with-fire|title=Archaeologists Find Earliest Evidence of Humans Cooking With Fire|website=DiscoverMagazine.com|access-date=8 November 2015|archive-date=27 December 2017|archive-url=https://web.archive.org/web/20171227181202/http://discovermagazine.com/2013/may/09-archaeologists-find-earliest-evidence-of-humans-cooking-with-fire|url-status=dead}}</ref>{{clarify|date=January 2023}} Archaeological evidence from 300,000 years ago,<ref>{{cite magazine | url=http://news.nationalgeographic.com/news/2014/01/140129-oldest-hearth-israel-cave-new-human-species-discovery-archaeology-science/ | archive-url=https://web.archive.org/web/20140201022042/http://news.nationalgeographic.com/news/2014/01/140129-oldest-hearth-israel-cave-new-human-species-discovery-archaeology-science/ | url-status=dead | archive-date=1 February 2014 | title=Oldest Known Hearth Found in Israel Cave | magazine=National Geographic | date=29 January 2014 | access-date=17 March 2014 | author=Smith, Roff}}</ref> in the form of ancient hearths, ]s, burnt animal bones, and ], are found across Europe and the Middle East. The oldest evidence (via heated fish teeth from a deep cave) of controlled use of fire to cook food ].<ref>{{cite news |title=Ancient human relative used fire, surprising discoveries suggest |url=https://www.washingtonpost.com/science/2022/12/05/homo-naledi-fire-evolution/ |access-date=11 December 2022 |newspaper=Washington Post}}</ref><ref>{{cite journal |last1=Zohar |first1=Irit |last2=Alperson-Afil |first2=Nira |last3=Goren-Inbar |first3=Naama |last4=Prévost |first4=Marion |last5=Tütken |first5=Thomas |last6=Sisma-Ventura |first6=Guy |last7=Hershkovitz |first7=Israel |last8=Najorka |first8=Jens |title=Evidence for the cooking of fish 780,000 years ago at Gesher Benot Ya'aqov, Israel |journal=Nature Ecology & Evolution |date=December 2022 |volume=6 |issue=12 |pages=2016–2028 |doi=10.1038/s41559-022-01910-z |pmid=36376603 |bibcode=2022NatEE...6.2016Z |s2cid=253522354 |language=en |issn=2397-334X |url=https://www.researchgate.net/publication/365369121 |url-access=subscription}}</ref> ]s think that widespread cooking fires began about 250,000 years ago when ]s first appeared.<ref>{{cite web|url=http://cogweb.ucla.edu/Abstracts/Pennisi_99.html |title= Pennisi: Did Cooked Tubers Spur the Evolution of Big Brains? |publisher=Cogweb.ucla.edu |access-date= 7 November 2013}}</ref> | |||
** ] | |||
Recently, the earliest hearths have been reported to be at least 790,000 years old.<ref name="SI-2016cook">{{cite web |author= |title=What Does It Mean To Be Human? – Hearths & Shelters |url=http://humanorigins.si.edu/evidence/behavior/hearths-shelters |date=12 August 2016 |work=] |access-date=12 August 2016 }}</ref> | |||
* ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
Communication between the ] and the ] in the ] influenced the history of cooking. The movement of foods across the Atlantic from the New World, such as ]es, ]es, ], ]s, ], ], ], ], ], ], ], ], ], ], ], ], ], ]s, ]s, and ], had a profound effect on Old World cooking. The movement of foods across the Atlantic from the Old World, such as ], ], ]s, ], ]s, ], ], ]s, ]s, ]s, ]s, ], and ]s, similarly changed New World cooking.<ref name = "history">{{cite journal |last1= Nunn |first1= Nathan |last2= Qian |first2= Nancy |year= 2010 |title= The Columbian Exchange: A History of Disease, Food, and Ideas |journal= ] |volume= 24 |issue= 2 |pages= 163–188 |jstor= 25703506 |doi= 10.1257/jep.24.2.163 |citeseerx= 10.1.1.232.9242 }}</ref> | |||
* ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
** ] | |||
In the 17th and 18th centuries, food was a classic marker of identity in Europe. In the 19th-century "Age of ]", ] became a defining symbol of national identity.{{Citation needed|date=August 2023}} | |||
* ] (colloquially known as "nuking") | |||
The ] brought mass-production, mass-marketing, and standardization of food. Factories processed, preserved, canned, and packaged a wide variety of foods, and processed cereals quickly became a defining feature of the American breakfast.<ref>{{cite web|url=http://www.nordion.com/documents/the-history-of-food-irradiation.pdf |title=The History of Food Irradiation |access-date=2012-03-27 |url-status=dead |archive-url=https://web.archive.org/web/20131116012256/http://www.nordion.com/documents/The-History-of-Food-Irradiation.pdf |archive-date=16 November 2013 }}</ref> In the 1920s, ], ]s, and ]s emerged. | |||
* ] | |||
** ] | |||
** ] | |||
** ] | |||
==Ingredients== | |||
* ] | |||
Most ingredients in cooking are derived from living ]s. Vegetables, fruits, grains and nuts as well as herbs and ]s come from plants, while meat, eggs, and dairy products come from animals. Mushrooms and the yeast used in baking are kinds of ]. Cooks also use ] and ]s such as ]. Cooks can also use ] or ]. | |||
Naturally occurring ingredients contain various amounts of molecules called '']'', '']s'' and '']s''. They also contain water and minerals. Cooking involves a manipulation of the chemical properties of these molecules. | |||
== Other (cool) preparation techniques == <!-- Please help keep lists alphabetized --> | |||
===Carbohydrates=== | |||
* ] | |||
{{Main|Carbohydrate}} | |||
* ] | |||
Carbohydrates include the common sugar, ] (table sugar), a ], and such simple sugars as ] (made by enzymatic splitting of sucrose) and ] (from fruit), and ]es from sources such as cereal flour, rice, ] and potato.<ref>{{Cite web|url=https://medlineplus.gov/ency/article/002469.htm|title=Carbohydrates: MedlinePlus Medical Encyclopedia|website=medlineplus.gov|language=en|access-date=2019-02-04}}</ref> | |||
* ] (e.g. sesame seeds to produce ]), chopping, slicing finely, grating, etc.. | |||
* ] | |||
* ] | |||
* ] | |||
* ] | |||
<!--====Ingredients==== Please help keep lists alphabetized *]--> | |||
== See also == | |||
The interaction of heat and carbohydrate is complex. ] such as ] tend to break down into more digestible ].<ref>{{Citation|last=Öste|first=Rickard E.|title=Nutritional and Toxicological Consequences of Food Processing|chapter=Digestibility of Processed Food Protein|date=1991|chapter-url=http://dx.doi.org/10.1007/978-1-4899-2626-5_27|series=Advances in Experimental Medicine and Biology|volume=289|pages=371–388|place=Boston, MA|publisher=Springer US|doi=10.1007/978-1-4899-2626-5_27|isbn=978-1-4899-2628-9|access-date=2021-05-19}}</ref> If the sugars are heated so that all water of ] is driven off, ] starts, with the sugar undergoing thermal decomposition with the formation of ], and other breakdown products producing ]. Similarly, the heating of sugars and proteins causes the ], a basic flavor-enhancing technique. | |||
Specific techniques and ingredients are often regional. See ] for information about the many regional and ethnic food traditions. Please see ] for some authors of books on cookery, food, and the history of food. | |||
* ] (includes conversions and equivalencies common in cooking) | |||
An ] of starch with fat or water can, when gently heated, provide thickening to the dish being cooked. In ] cooking, a mixture of butter and flour called a ] is used to thicken liquids to make stews or sauces.<ref>{{Cite web|url=https://guide.michelin.com/sg/dining-in/what-is-roux-sg/news|title=What is...roux?|website=MICHELIN Guide|language=en|access-date=2019-02-04}}</ref> In Asian cooking, a similar effect is obtained from a mixture of rice or ] and water. These techniques rely on the properties of starches to create simpler mucilaginous ]s during cooking, which causes the familiar thickening of ]s. This thickening will break down, however, under additional heat. | |||
===Fats=== | |||
{{Main|Fat|Cooking oil}} | |||
]s frying in oil]] | |||
Types of fat include ]s, animal products such as butter and ], as well as fats from grains, including ] and ] oils. Fats are used in a number of ways in cooking and baking. To prepare ], ] or ]s, the pan or griddle is often coated with fat or oil. Fats are also used as an ingredient in baked goods such as ], cakes and pies. Fats can reach temperatures higher than the boiling point of water, and are often used to conduct high heat to other ingredients, such as in frying, deep frying or sautéing. Fats are used to add flavor to food (e.g., butter or bacon fat), prevent food from sticking to pans and create a desirable texture. | |||
Fats are one of the three main ] groups in human ], along with ]s and ]s,<ref name="webster2">Entry for ] {{Cite web |url=https://www.merriam-webster.com/dictionary/fat |title=Fat | Definition of Fat by Merriam-Webster |access-date=8 December 2023 |archive-date=25 July 2020 |archive-url=https://web.archive.org/web/20200725084302/https://www.merriam-webster.com/dictionary/fat |url-status=bot: unknown }} in the online Merriam-Webster disctionary, sense 3.2. Accessed on 2020-08-09</ref><ref name="mckin20142">{{Cite web |title=Macronutrients: the Importance of Carbohydrate, Protein, and Fat |url=http://www.mckinley.illinois.edu/handouts/macronutrients.htm |archive-url=https://web.archive.org/web/20140921024358/http://www.mckinley.illinois.edu/handouts/macronutrients.htm |archive-date=21 September 2014 |access-date=20 September 2014 |website=McKinley Health Center |publisher=]}}</ref> and the main components of common food products like ], ], ], ], ], and ]s. They are a major and dense source of ] for many animals and play important structural and ] functions, in most living beings, including energy storage, waterproofing, and ].<ref name="khan00002">{{cite web |title=Introduction to Energy Storage |url=http://www.khanacademy.org/test-prep/mcat/biomolecules/fat-and-protein-metabolism/v/introduction-to-energy-storage |publisher=]}}</ref> The human body can produce the fat it requires from other food ingredients, except for a few ]s that must be included in the diet. Dietary fats are also the carriers of some ] and ] ingredients and ]s that are ].<ref name="sand20162">Thomas A. B. Sanders (2016): "The Role of Fats in Human Diet". Pages 1-20 of ''Functional Dietary Lipids''. Woodhead/Elsevier, 332 pages. {{isbn|978-1-78242-247-1}}{{doi|10.1016/B978-1-78242-247-1.00001-6}}</ref> | |||
===Proteins=== | |||
{{Main|Protein (nutrient)|Protein denaturation}} | |||
Edible animal material, including ], ], milk, ] and ]s, contains substantial amounts of protein.<ref name=":3">{{Cite journal |last1=Reynolds |first1=Daman |last2=Caminiti |first2=Jeff |last3=Edmundson |first3=Scott |last4=Gao |first4=Song |last5=Wick |first5=Macdonald |last6=Huesemann |first6=Michael |date=2022-07-12 |title=Seaweed proteins are nutritionally valuable components in the human diet |journal=The American Journal of Clinical Nutrition |volume=116 |issue=4 |pages=855–861 |doi=10.1093/ajcn/nqac190 |issn=0002-9165 |pmid=35820048 |doi-access=free}}</ref><ref name="nih1">{{cite web |year=2009 |title=Protein in diet |url=https://www.nlm.nih.gov/medlineplus/ency/article/002467.htm |publisher=United States National Library of Medicine, National Institutes of Health}}</ref><ref name=":01">{{Cite web |title=High-Protein Alternatives to Meat |url=https://getpocket.com/explore/item/high-protein-alternatives-to-meat |access-date=2022-06-09 |website=Pocket |language=en}}</ref> Almost all vegetable matter (in particular ]s and ]s) also includes proteins, although generally in smaller amounts.<ref>{{Cite web |title=cooking - Fun_with_Words - 博客园 |url=https://www.cnblogs.com/funwithwords/p/16615263.html |access-date=2023-12-08 |website=www.cnblogs.com |language=zh-cn}}</ref> Mushrooms have high protein content.<ref>{{Cite journal |last1=Wang |first1=Meiqi |last2=Zhao |first2=Ruilin |date=2023-03-01 |title=A review on nutritional advantages of edible mushrooms and its industrialization development situation in protein meat analogues |journal=Journal of Future Foods |volume=3 |issue=1 |pages=1–7 |doi=10.1016/j.jfutfo.2022.09.001 |issn=2772-5669|doi-access=free }}</ref><ref>{{Cite journal |last1=Rahi |first1=Deepak K. |last2=Malik |first2=Deepika |date=2016 |title=Diversity of Mushrooms and Their Metabolites of Nutraceutical and Therapeutic Significance |url=https://www.academia.edu/61123496 |journal=Journal of Mycology |volume=2016 |pages=1–18 |doi=10.1155/2016/7654123 |doi-access=free |issn=2356-7481}}</ref> Any of these may be sources of ]s.<ref>{{Cite book |last=Baofu |first=Peter |url=https://books.google.com/books?id=J7QwBwAAQBAJ&dq=%22Any+of+these+may+be+sources+of+essential+amino+acids%22&pg=PA6 |title=The Future of Post-Human Culinary Art: Towards a New Theory of Ingredients and Techniques |date=2013-01-03 |publisher=Cambridge Scholars Publishing |isbn=978-1-4438-4484-0 |language=en}}</ref> When ]s are heated they become ] (unfolded) and change texture. In many cases, this causes the structure of the material to become softer or more ] – meat becomes ''cooked'' and is more friable and less flexible. In some cases, proteins can form more rigid structures, such as the coagulation of ] in egg whites. The formation of a relatively rigid but flexible matrix from egg white provides an important component in baking cakes, and also underpins many desserts based on ]. | |||
]s.]] | |||
===Water=== | |||
{{Main|Water}} | |||
Cooking often involves water, and water-based liquids. These can be added in order to immerse the substances being cooked (this is typically done with water, ] or wine). Alternatively, the foods themselves can release water. A favorite method of adding flavor to dishes is to save the liquid for use in other ]s. Liquids are so important to cooking that the name of the cooking method used is often based on how the liquid is combined with the food, as in ], ], ], ] and ]. Heating liquid in an open container results in rapidly increased ], which ]s the remaining ] and ingredients; this is a critical component of both ] and sauce making. | |||
===Vitamins and minerals=== | |||
] | |||
{{Main|Vitamin|Mineral (nutrient)}} | |||
Vitamins and minerals are required for normal ]; and what the body cannot manufacture itself must come from external sources. Vitamins come from several sources including fresh fruit and vegetables (]), carrots, ] (]), cereal bran, bread, liver (B vitamins), fish liver oil (]) and fresh green vegetables (]). Many minerals are also essential in small quantities including iron, ], ], ] and ]; and in very small quantities copper, ] and ]. The micronutrients, minerals, and vitamins<ref>{{Cite web|url=http://www.brighthub.com/health/diet-nutrition/articles/44825.aspx|archiveurl=https://web.archive.org/web/20090909071119/http://www.brighthub.com/health/diet-nutrition/articles/44825.aspx|url-status=dead |title=Loss of nutrients when vegetables are cooked|archivedate=9 September 2009}}</ref> in fruit and vegetables may be destroyed or eluted by cooking. Vitamin C is especially prone to oxidation during cooking and may be completely destroyed by protracted cooking.<ref name="news.bbc.co.uk">{{cite news| url=http://news.bbc.co.uk/1/hi/health/359175.stm |work=BBC News | title=Cooking vegetables 'improves benefits' | date=2 June 1999 | access-date=30 April 2010}}</ref>{{Failed verification|date=February 2013}} The ] of some vitamins such as ], ], ], ], and ]s are increased with cooking by being freed from the food microstructure.<ref>{{cite journal | last1=Hotz | first1=Christine | last2=Gibson | first2=Rosalind S. | year=2007 | title=Traditional food-processing and preparation practices to enhance the bioavailability of micronutrients in plant-based diets | journal=The Journal of Nutrition | volume=137 | issue=4| pages=1097–1100 | doi=10.1093/jn/137.4.1097 | pmid=17374686 | doi-access=free }}</ref> Blanching or steaming vegetables is a way of minimizing vitamin and mineral loss in cooking.<ref>{{Cite journal |date=2017-10-12 |title=Effect of different cooking methods on the content of vitamins and true retention in selected vegetables |pmc=6049644 |last1=Lee |first1=S. |last2=Choi |first2=Y. |last3=Jeong |first3=H. S. |last4=Lee |first4=J. |last5=Sung |first5=J. |journal=Food Science and Biotechnology |volume=27 |issue=2 |pages=333–342 |doi=10.1007/s10068-017-0281-1 |pmid=30263756 }}</ref> | |||
==Methods== | |||
{{See also|List of cooking techniques}} | |||
{{unreferenced section|date=March 2017}} | |||
There are many methods of cooking, most of which have been known since antiquity. These include baking, roasting, frying, grilling, barbecuing, smoking, boiling, steaming and braising. A more recent innovation is microwaving. Various methods use differing levels of heat and moisture and vary in cooking time. The method chosen greatly affects the result. Some major hot cooking techniques include: | |||
]s in a ].]] | |||
;Roasting | |||
:] – ] – ]/] – ] – ] | |||
;Baking | |||
:] – ] | |||
;Boiling | |||
:] – ] – ] – ] – ] – ] – ] – ] – ] – ] – ] – ] – ] – ] – ] | |||
;Frying | |||
:] – ] — ] – ] – ] – ] – ] – ] – ] – ] – ] – ] | |||
;Steaming | |||
:] works by boiling water continuously, causing it to vaporise into steam; the steam then carries heat to the nearby food, thus cooking the food. By many it is considered a healthy form of cooking, holding nutrients within the vegetable or meat being cooked. | |||
: ] – The food is put into a pouch and then baked, allowing its own moisture to steam the food. | |||
;Smoking | |||
:] is the process of flavoring, cooking, or preserving food by exposing it to smoke from burning or smoldering material, most often wood. | |||
==Health and safety== | |||
=== Indoor air pollution === | |||
{{Main|Household air pollution}} | |||
As of 2021, over 2.6 billion people cook using open fires or inefficient stoves using ], ], and ] as fuel.<ref>{{Cite web |title=Household air pollution |url=https://www.who.int/news-room/fact-sheets/detail/household-air-pollution-and-health |access-date=2023-12-08 |website=www.who.int |language=en}}</ref><ref>{{Cite web |date=2023-01-16 |title=Polluting cooking methods, used by billions of people around the world, remain a threat to women's health |url=https://www.equaltimes.org/polluting-cooking-methods-used-by |access-date=2023-12-08 |website=Equal Times |language=en}}</ref> These cooking practices use fuels and technologies that produce high levels of household air pollution, causing 3.8 million premature deaths annually. Of these deaths, 27% are from ], 27% from ], 20% from ], 18% from ], and 8% from ]. Women and young children are disproportionately affected, since they spend the most time near the hearth.<ref name="who-airpollution">{{cite web |title=Household air pollution and health |url=https://www.who.int/news-room/fact-sheets/detail/household-air-pollution-and-health |publisher=World Health Organization |access-date=12 April 2022 |date=22 September 2021}}</ref> | |||
=== Security while cooking === | |||
Hazards while cooking can include | |||
* Unseen slippery surfaces (such as from oil stains, water droplets, or items that have fallen on the floor) | |||
* Cuts; about a third of the US's estimated annual 400,000 knife injuries are kitchen-related.<ref>{{Cite web|title=A Guide to Keeping Safe While Cooking|url=https://staysafe.org/safety/cooking/|access-date=2021-07-03|website=StaySafe.org|language=en-US}}</ref> | |||
* Burns or fires | |||
To prevent those injuries there are protections such as cooking clothing, anti-slip shoes, fire extinguisher and more. | |||
===Food safety=== | |||
{{Main|Food safety}} | |||
Cooking can prevent many ]es that would otherwise occur if raw food is consumed. When heat is used in the preparation of food, it can kill or inactivate harmful organisms, such as ] and viruses, as well as various parasites such as ]s and '']''. Food poisoning and other illness from uncooked or poorly prepared food may be caused by bacteria such as ] of '']'', '']'' and '']'', viruses such as ]es, and ] such as '']''. Bacteria, viruses and parasites may be introduced through salad, meat that is uncooked or done ], and unboiled water.<ref>{{cite web|url=https://www.niddk.nih.gov/health-information/digestive-diseases/foodborne-illnesses|title= Foodborne Illnesses |work=National Institute of Diabetes and Digestive and Kidney Diseases }}</ref> | |||
The ] effect of cooking depends on temperature, cooking time, and technique used. Some ] bacteria such as '']'' or '']'' can form spores that survive cooking or boiling, which then ] and regrow after the food has cooled. This makes it unsafe to reheat cooked food more than once.<ref>{{Cite web|url=http://www.foodstandards.gov.au/_srcfiles/complete_safefood.pdf|archiveurl=https://web.archive.org/web/20100922234817/http://www.foodstandards.gov.au/_srcfiles/complete_safefood.pdf|url-status=dead |title=Safe Food Australia – A Guide to the Food Safety Standards|archivedate=22 September 2010}}</ref> | |||
Cooking increases the digestibility of many foods which are inedible or poisonous when raw. For example, raw ] grains are hard to digest, while ]s are toxic when raw or improperly cooked due to the presence of ], which is inactivated by cooking for at least ten minutes at {{convert|100|C}}.<ref>{{cite journal |vauthors=Noah ND, Bender AE, Reaidi GB, Gilbert RJ |title=News, Notes, And Epidemiology |journal=Br Med J |volume=281 |issue=6234 |pages=236–237 |date=July 1980 |pmid=7407532 |doi=10.1136/bmj.281.6234.235 |pmc=1713670}}</ref> | |||
Food safety depends on the safe preparation, handling, and storage of food. Food spoilage bacteria proliferate in the "]" temperature range from {{convert|40|to|140|F|C}}; therefore, food should not be stored in this temperature range. ] and surfaces, especially when handling different meats, and keeping raw food separate from cooked food to avoid cross-contamination,<ref>{{cite web|url=https://www.fsis.usda.gov/wps/wcm/connect/d468f3d9-fb6c-4109-88d7-2931f7132098/Barbecue_Food_Safety.pdf?MOD=AJPERES|title=Grilling and Food Safety|publisher =USDA|access-date=30 January 2019|date=June 2017}}</ref> are good practices in food preparation.<ref>{{cite web|url=http://www.fsis.usda.gov/Factsheets/Basics_for_Handling_Food_Safely/index.asp |title=Basics for Handling Food Safely |publisher=United States Department of Agriculture |access-date=1 April 2012 |archive-url=https://web.archive.org/web/20040928210429/http://www.fsis.usda.gov/factsheets/Basics_for_Handling_Food_Safely/index.asp |archive-date=28 September 2004 }}</ref> Foods prepared on plastic cutting boards may be less likely to harbor bacteria than wooden ones.<ref>{{cite web|url=http://ag.arizona.edu/pubs/health/foodsafety/az1076.html|title=Cutting Boards (Plastic Versus Wood)|publisher=Cooperative Extension, College of Agriculture & Life Sciences, the University of Arizona|work=Food Safety, Preparation and Storage Tips|year=1998|access-date=21 June 2006 |archive-url=https://web.archive.org/web/20060613074257/http://ag.arizona.edu/pubs/health/foodsafety/az1076.html |archive-date=13 June 2006}}</ref><ref name="ReluctantGourmet">{{cite web|url=http://www.reluctantgourmet.com/cutting_board.htm|title=Cutting Boards – wood or plastic?|work=ReluctantGourmet.com|access-date=21 June 2006|url-status=dead|archive-url=https://web.archive.org/web/20060702142255/http://www.reluctantgourmet.com/cutting_board.htm|archive-date=2 July 2006}}</ref> Washing and ] cutting boards, especially after use with raw meat, poultry, or seafood, reduces the risk of contamination.<ref name="ReluctantGourmet"/> | |||
===Effects on nutritional content of food=== | |||
{{See also|Raw foodism}} | |||
] with ]s, ], ] and ]s on ] noodles.]] | |||
Proponents of ] argue that cooking food increases the risk of some of the detrimental effects on food or health. They point out that during cooking of vegetables and fruit containing ], the vitamin elutes into the cooking water and becomes degraded through oxidation. Peeling vegetables can also substantially reduce the vitamin C content, especially in the case of potatoes where most vitamin C is in the skin.<ref>{{cite web|url=http://www.potato2008.org/en/potato/factsheets.html|title=Potato, nutrition and diet – International Year of the Potato 2008|access-date=14 August 2011|archive-url=https://web.archive.org/web/20071105095547/http://www.potato2008.org/en/potato/factsheets.html|archive-date=5 November 2007|url-status=dead}}</ref> However, research has shown that in the specific case of ]s a greater proportion is absorbed from cooked vegetables than from raw vegetables.<ref name="news.bbc.co.uk"/> | |||
], a ] breakdown product, is present in vegetables such as ], and is mostly destroyed when the vegetable is boiled.<ref>{{Cite journal | last1=Jin | first1=Y. | last2=Wang | first2=M. | last3=Rosen | first3=R. T. | last4=Ho | first4=C. T. | title=Thermal Degradation of Sulforaphane in Aqueous Solution | doi=10.1021/jf990082e | journal=Journal of Agricultural and Food Chemistry | volume=47 | issue=8 | pages=3121–3123 | year=1999 | pmid= 10552618| bibcode=1999JAFC...47.3121J }}</ref><ref>{{cite journal|last1=Bongoni|first1=R|last2=Verkerk|first2=R|last3=Steenbekkers|first3=B|last4=Dekker| last5=Stieger|first4=M|title= Evaluation of Different Cooking Conditions on Broccoli (Brassica oleracea var. italica) to Improve the Nutritional Value and Consumer Acceptance.|journal= Plant Foods for Human Nutrition|doi=10.1007/s11130-014-0420-2|volume=69|issue=3|pages=228–234|pmid=24853375|year=2014|s2cid=35228794}}</ref> Although there has been some basic research on how ] might exert beneficial effects in vivo, there is no high-quality evidence for its efficacy against human diseases. | |||
The ] has studied retention data for 16 vitamins, 8 minerals, and alcohol for approximately 290 foods across various cooking methods.<ref>{{Cite web|url=https://www.ars.usda.gov/SP2UserFiles/Place/80400525/Data/retn/retn06.pdf |archive-url=https://ghostarchive.org/archive/20221009/https://www.ars.usda.gov/SP2UserFiles/Place/80400525/Data/retn/retn06.pdf |archive-date=2022-10-09 |url-status=live|title=USDA Table of Nutrient Retention Factors, Release 6|date=Dec 2007|website=USDA|publisher=USDA.}}</ref> | |||
===Carcinogens and AGEs=== | |||
], ] and ]-wrapped ] cooking in a ] smoker. Barbecuing and smoking generate carcinogens.]] | |||
In a human epidemiological analysis by ] and ] in 1981, diet was estimated to cause a large percentage of cancers.<ref>{{Cite journal | |||
| last1=Doll | first1=R. | |||
| last2=Peto | first2=R. | |||
| title=The causes of cancer: Quantitative estimates of avoidable risks of cancer in the United States today | |||
| journal=Journal of the National Cancer Institute | |||
| volume =66 | |||
| issue=6 | |||
| pages=1191–1308 | |||
| year =1981 | |||
| pmid =7017215 | |||
| doi=10.1093/jnci/66.6.1192 | |||
}}</ref> Studies suggest that around 32% of cancer deaths may be avoidable by changes to the diet.<ref>{{cite journal |title=Diet, nutrition, and avoidable cancer |author=Willett WC |journal=Environ Health Perspect |year= 1995 |issue=Suppl 8 |pages=165–170 |pmid=8741778 |pmc=1518978 |doi=10.1289/ehp.95103s8165 |volume=103 |bibcode=1995EnvHP.103S.165W }}</ref> Some of these cancers may be caused by carcinogens in food generated during the cooking process, although it is often difficult to identify the specific components in diet that serve to increase cancer risk.<ref name="carcinogens and anticarcinogens">{{cite book |title=Carcinogens and Anticarcinogens in the Human Diet |url=https://archive.org/details/carcinogensantic0000nati |url-access=registration |publisher=National Academy Press |year=1996 |isbn=978-0-309-05391-4 }}</ref> | |||
Several studies published since 1990 indicate that cooking meat at high temperature creates ]s (HCA's), which are thought to increase cancer risk in humans. Researchers at the ] 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 name=amines>{{cite web |url=http://www.cancer.gov/cancertopics/factsheet/Risk/heterocyclic-amines |title=Heterocyclic Amines in Cooked Meats |publisher=] |year=2018 }}</ref> While avoiding meat or eating meat raw may be the only ways to avoid HCA's in meat fully, the National Cancer Institute states that cooking meat below {{convert|212|F}} creates "negligible amounts" of HCA's. Also, ] meat before cooking may reduce HCAs by 90% by reducing the time needed for the meat to be cooked at high heat.<ref name=amines/> ]s are found in some food, and may be produced by some cooking processes from proteins or from nitrites used as food preservatives; cured meat such as bacon has been found to be carcinogenic, with links to colon cancer. ], which is added to cured meat, however, reduces nitrosamine formation.<ref name="carcinogens and anticarcinogens"/><ref>{{cite journal |journal=Cancer Res. |year=1983 |volume=43 |issue=5 Suppl|pages=2435s–2440s |title=Formation and occurrence of nitrosamines in food |author=Scanlan RA. |pmid= 6831466 }}</ref> | |||
Baking, grilling or broiling food, especially starchy foods, until a toasted crust is formed generates significant concentrations of ]. This discovery in 2002 led to international health concerns. Subsequent research has however found that it is not likely that the acrylamides in burnt or well-cooked food cause cancer in humans; ] categorizes the idea that burnt food causes cancer as a "myth".<ref name=cruk>{{cite web |url=https://www.cancerresearchuk.org/about-cancer/causes-of-cancer/cancer-myths/can-eating-burnt-foods-cause-cancer |publisher=Cancer Research UK |title=Can eating burnt foods cause cancer? |date=15 October 2021 }}</ref> | |||
Cooking food at high temperature may create ]s (AGEs) that are believed to be involved in a number of diseases, including diabetes, chronic kidney disease, cancer and cardiovascular diseases, as well as in ageing. AGEs are a group of compounds that are formed between reducing sugars and amino acids via ]. These compounds impart colors, tastes and smells that are specific to these food, but may also be deleterious to health.<ref>{{cite journal |journal= Am J Lifestyle Med|date= May 2017 |volume=13|issue=4|pages=384–404| doi= 10.1177/1559827617708991|title=Advanced Glycation End Products and Risks for Chronic Diseases: Intervening Through Lifestyle Modification |first1=Chandan |last1=Prasad |first2= Kathleen E |last2=Davis|first3= Victorine |last3=Imrhan |first4= Shanil|last4= Juma |first5= Parakat |last5=Vijayagopal |pmid= 31285723 |pmc= 6600625 }}</ref> Dry heat (e.g. in roasting or grilling) can significantly increase the production of AGEs, as well as food rich in animal protein and fats. The production of AGEs during cooking can be significantly reduced by cooking in water or moist heat, reducing the cooking times and temperatures, as well as by first marinating the meat in acidic ingredients such as lemon juice and vinegar.<ref>{{cite journal |journal=J Am Diet Assoc|date= June 2010 |volume=110|issue=6|pages=911–16.e12| doi= 10.1016/j.jada.2010.03.018|title=Advanced Glycation End Products in Foods and a Practical Guide to Their Reduction in the Diet|first1=Jaime |last1=Uribarri |first2= Sandra |last2=Woodruff|first3= Susan|last3= Goodman|first4= Weijing |last4=Cai|first5= Xue |last5=Chen|first6= Renata |last6=Pyzik|first7= Angie |last7=Yong|first8= Gary E |last8=Striker|first9= Helen|last9= Vlassara|pmid= 20497781 |pmc= 3704564 }}</ref> | |||
==Scientific aspects== | |||
{{main|Molecular gastronomy}} | |||
The scientific study of cooking has become known as molecular gastronomy. This is a subdiscipline of ] concerning the physical and chemical transformations that occur during cooking.<ref> {{Webarchive|url=https://web.archive.org/web/20211019161107/https://www.britannica.com/topic/molecular-gastronomy#:~:text=Molecular%20gastronomy%2C%20the%20scientific%20discipline,new%20dishes%20and%20culinary%20techniques. |date=19 October 2021 }} from ''Encyclopedia Britannica''</ref> | |||
Important contributions have been made by scientists, chefs and authors such as ] (chemist), ] (physicist), ] (physicist), ] (author), ] (biochemist, author), ] (chemist, author.) It is different for the application of scientific knowledge to cooking, that is "molecular cooking" (for the technique) or "molecular cuisine" (for a culinary style), for which chefs such as Raymond Blanc, Philippe and Christian Conticini, ], ], ] (chef).<ref>{{Cite book|last=Guler|first=Ozan|title=The Harmony of Science and Food:Molecular Gastronomy|publisher=Strategic Researchers Academy Publishing|date= 2019|isbn=978-605-69709-1-7}}</ref> | |||
Chemical processes central to cooking include hydrolysis (in particular beta elimination of pectins, during the thermal treatment of plant tissues), pyrolysis, and glycation reactions wrongly named ].<ref>{{Cite web|url=http://www.food-info.net/uk/colour/maillard.htm|title=Food-Info.net : Maillard reactions|website=www.food-info.net|access-date=2017-03-29}}</ref><ref>Handbook of Molecular Gastronomy, CRC Press, 2021</ref> | |||
Cooking foods with heat depends on many factors: the ] of an object, ], and (perhaps most significantly) the difference in temperature between the two objects. ] is the combination of specific heat, conductivity and ] that determines how long it will take for the food to reach a certain temperature.<ref>{{cite book|last=Barham|first=Peter|title=The Science of Cooking|page=39}}</ref> | |||
==Home-cooking and commercial cooking== | |||
], Germany (Haxnbauer restaurant)]] | |||
Home cooking has traditionally been a process carried out informally in a home or around a ], and can be enjoyed by all members of the family, although in many cultures women bear primary responsibility.<ref>{{cite book|last1=Jackson|first1=Cecile|title=Men at Work: Labour, Maculinities, Development|date=2013|publisher=Routledge|location=New York|pages=225}}</ref> Cooking is also often carried out outside of personal quarters, for example at restaurants, or schools. ] were one of the earliest forms of cooking outside the home, and bakeries in the past often offered the cooking of pots of food provided by their customers as an additional service. In the present day, factory food preparation has become common, with many "ready-to-eat" as well as "ready-to-cook" foods being prepared and cooked in factories and home cooks using a mixture of ], and factory made foods together to make a ]. The nutritional value of including more commercially prepared foods has been found to be inferior to home-made foods.<ref>{{Cite web|title=Nutritional Quality of Food Prepared at Home and Away From Home, 1977–2008|url=http://www.ers.usda.gov/publications/eib-economic-information-bulletin/eib105.aspx|website=www.ers.usda.gov|access-date=2015-11-21|last1=Lin|first1=Biing-Hwan|last2=Guthrie|first2=Joanne|publisher=U.S. Department of Agriculture|url-status=dead|archive-url=https://web.archive.org/web/20151122104524/http://www.ers.usda.gov/publications/eib-economic-information-bulletin/eib105.aspx|archive-date=22 November 2015}}</ref> Home-cooked meals tend to be healthier with fewer calories, and less ], ] and ] on a per calorie basis while providing more ], ], and ].<ref>{{Cite journal|title=Impact of cooking and home food preparation interventions among adults: outcomes and implications for future programs |journal=Journal of Nutrition Education and Behavior |date=2014-08-01 |issn=1878-2620|pmc=4063875 |pmid=24703245 |pages=259–276 |volume=46|issue=4|doi=10.1016/j.jneb.2014.02.001|first1=Marla|last1=Reicks|first2=Amanda C. |last2=Trofholz |first3=Jamie S.|last3=Stang|first4=Melissa N.|last4=Laska}}</ref> The ingredients are also directly sourced, so there is control over authenticity, taste, and nutritional value. The superior nutritional quality of home-cooking could therefore play a role in preventing ].<ref>{{Cite journal|title=Benefits and Barriers to Healthful Eating What Are the Consequences of Decreased Food Preparation Ability?|journal=American Journal of Lifestyle Medicine|date=2012-03-01|issn=1559-8276|pages=152–158|volume=6|issue=2|doi=10.1177/1559827611426394|first1=Lu Ann Laurice|last1=Soliah|first2=Janelle Marshall|last2=Walter|first3=Sheila Ann|last3=Jones|citeseerx=10.1.1.1026.8612|s2cid=71797396}}</ref> Cohort studies following the elderly over 10 years show that adults who cook their own meals have significantly lower mortality, even when controlling for confounding variables.<ref>{{Cite journal|title=Cooking frequency may enhance survival in Taiwanese elderly|journal=Public Health Nutrition|date=2012-07-01 |issn=1475-2727 |pmid=22578892 |pages=1142–1149|volume=15 |issue=7|doi=10.1017/S136898001200136X|first1=Rosalind Chia-Yu|last1=Chen |first2=Meei-Shyuan|last2=Lee|first3=Yu-Hung|last3=Chang|first4=Mark L.|last4=Wahlqvist|url=http://ir.nhri.org.tw/bitstream/3990099045/6476/1/PUB22578892.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://ir.nhri.org.tw/bitstream/3990099045/6476/1/PUB22578892.pdf |archive-date=2022-10-09 |url-status=live|doi-access=free}}</ref> | |||
"Home-cooking" may be associated with ],<ref>{{Cite book|url=https://books.google.com/books?id=6VMmDwAAQBAJ&q=Home-cooking+may+be+associated+with+comfort+food&pg=PT106|title=Comfort Food: Meaning and Memories|last1=Jones|first1=Michael Owen|last2=Long|first2=Lucy M.|date=2017|publisher=Univ. Press of Mississippi|isbn=978-1-4968-1086-1|language=en}}</ref> and some commercially produced foods and restaurant meals are presented through advertising or ] as having been "home-cooked", regardless of their actual origin. This trend began in the 1920s and is attributed to people in urban areas of the U.S. wanting homestyle food even though their schedules and smaller kitchens made cooking harder.<ref>{{Cite journal |title=Just Like Home: "Home Cooking" and the Domestication of the American Restaurant |journal=Gastronomica |date=Fall 2002 |pages=43–52 |volume=2 |issue=4 |doi=10.1525/gfc.2002.2.4.43 |first=Samantha |last=Barbas |jstor=10.1525/gfc.2002.2.4.43 |url=https://digitalcommons.law.buffalo.edu/cgi/viewcontent.cgi?article=1016&context=articles }}{{Dead link|date=December 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> | |||
==See also== | |||
{{Main|Outline of food preparation}} | |||
{{Portal|Food}} | |||
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* ] | * ] | ||
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* ] including ], frying pans, ]s and many others. | |||
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==References== | |||
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==External links== | |||
For recipes, see the ] and the ]. Also see ]. | |||
* {{cite EB1911|wstitle=Cookery|volume=7|pages=74–76}} | |||
* ] (1861), '''' | |||
{{Cooking Techniques}} | |||
== External link == | |||
{{cuisine}} | |||
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Latest revision as of 06:59, 11 January 2025
Preparing food using heat This article is about the preparation of food specifically via heat. For a general outline, see Outline of food preparation. For varied styles of international food, see Cuisine. Not to be confused with Coking.
Cooking, also known as cookery or professionally as the culinary arts, is the art, science and craft of using heat to make food more palatable, digestible, nutritious, or safe. Cooking techniques and ingredients vary widely, from grilling food over an open fire, to using electric stoves, to baking in various types of ovens, reflecting local conditions. Cooking is an aspect of all human societies and a cultural universal.
Types of cooking also depend on the skill levels and training of the cooks. Cooking is done both by people in their own dwellings and by professional cooks and chefs in restaurants and other food establishments.
Preparing food with heat or fire is an activity unique to humans. Archeological evidence of cooking fires from at least 300,000 years ago exists, but some estimate that humans started cooking up to 2 million years ago.
The expansion of agriculture, commerce, trade, and transportation between civilizations in different regions offered cooks many new ingredients. New inventions and technologies, such as the invention of pottery for holding and boiling of water, expanded cooking techniques. Some modern cooks apply advanced scientific techniques to food preparation to further enhance the flavor of the dish served.
History
Phylogenetic analysis suggests that early hominids may have adopted cooking 1 million to 2 million years ago. Re-analysis of burnt bone fragments and plant ashes from the Wonderwerk Cave in South Africa has provided evidence supporting control of fire by early humans 1 million years ago. In his seminal work Catching Fire: How Cooking Made Us Human, Richard Wrangham suggested that evolution of bipedalism and a large cranial capacity meant that early Homo habilis regularly cooked food. However, unequivocal evidence in the archaeological record for the controlled use of fire begins at 400,000 BCE, long after Homo erectus. Archaeological evidence from 300,000 years ago, in the form of ancient hearths, earth ovens, burnt animal bones, and flint, are found across Europe and the Middle East. The oldest evidence (via heated fish teeth from a deep cave) of controlled use of fire to cook food by archaic humans was dated to ~780,000 years ago. Anthropologists think that widespread cooking fires began about 250,000 years ago when hearths first appeared.
Recently, the earliest hearths have been reported to be at least 790,000 years old.
Communication between the Old World and the New World in the Columbian Exchange influenced the history of cooking. The movement of foods across the Atlantic from the New World, such as potatoes, tomatoes, maize, beans, bell pepper, chili pepper, vanilla, pumpkin, cassava, avocado, peanut, pecan, cashew, pineapple, blueberry, sunflower, chocolate, gourds, green beans, and squash, had a profound effect on Old World cooking. The movement of foods across the Atlantic from the Old World, such as cattle, sheep, pigs, wheat, oats, barley, rice, apples, pears, peas, chickpeas, mustard, and carrots, similarly changed New World cooking.
In the 17th and 18th centuries, food was a classic marker of identity in Europe. In the 19th-century "Age of Nationalism", cuisine became a defining symbol of national identity.
The Industrial Revolution brought mass-production, mass-marketing, and standardization of food. Factories processed, preserved, canned, and packaged a wide variety of foods, and processed cereals quickly became a defining feature of the American breakfast. In the 1920s, freezing methods, cafeterias, and fast food restaurants emerged.
Ingredients
Most ingredients in cooking are derived from living organisms. Vegetables, fruits, grains and nuts as well as herbs and spices come from plants, while meat, eggs, and dairy products come from animals. Mushrooms and the yeast used in baking are kinds of fungi. Cooks also use water and minerals such as salt. Cooks can also use wine or spirits.
Naturally occurring ingredients contain various amounts of molecules called proteins, carbohydrates and fats. They also contain water and minerals. Cooking involves a manipulation of the chemical properties of these molecules.
Carbohydrates
Main article: CarbohydrateCarbohydrates include the common sugar, sucrose (table sugar), a disaccharide, and such simple sugars as glucose (made by enzymatic splitting of sucrose) and fructose (from fruit), and starches from sources such as cereal flour, rice, arrowroot and potato.
The interaction of heat and carbohydrate is complex. Long-chain sugars such as starch tend to break down into more digestible simpler sugars. If the sugars are heated so that all water of crystallisation is driven off, caramelization starts, with the sugar undergoing thermal decomposition with the formation of carbon, and other breakdown products producing caramel. Similarly, the heating of sugars and proteins causes the Maillard reaction, a basic flavor-enhancing technique.
An emulsion of starch with fat or water can, when gently heated, provide thickening to the dish being cooked. In European cooking, a mixture of butter and flour called a roux is used to thicken liquids to make stews or sauces. In Asian cooking, a similar effect is obtained from a mixture of rice or corn starch and water. These techniques rely on the properties of starches to create simpler mucilaginous saccharides during cooking, which causes the familiar thickening of sauces. This thickening will break down, however, under additional heat.
Fats
Main articles: Fat and Cooking oilTypes of fat include vegetable oils, animal products such as butter and lard, as well as fats from grains, including maize and flax oils. Fats are used in a number of ways in cooking and baking. To prepare stir fries, grilled cheese or pancakes, the pan or griddle is often coated with fat or oil. Fats are also used as an ingredient in baked goods such as cookies, cakes and pies. Fats can reach temperatures higher than the boiling point of water, and are often used to conduct high heat to other ingredients, such as in frying, deep frying or sautéing. Fats are used to add flavor to food (e.g., butter or bacon fat), prevent food from sticking to pans and create a desirable texture.
Fats are one of the three main macronutrient groups in human diet, along with carbohydrates and proteins, and the main components of common food products like milk, butter, tallow, lard, salt pork, and cooking oils. They are a major and dense source of food energy for many animals and play important structural and metabolic functions, in most living beings, including energy storage, waterproofing, and thermal insulation. The human body can produce the fat it requires from other food ingredients, except for a few essential fatty acids that must be included in the diet. Dietary fats are also the carriers of some flavor and aroma ingredients and vitamins that are not water-soluble.
Proteins
Main articles: Protein (nutrient) and Protein denaturationEdible animal material, including muscle, offal, milk, eggs and egg whites, contains substantial amounts of protein. Almost all vegetable matter (in particular legumes and seeds) also includes proteins, although generally in smaller amounts. Mushrooms have high protein content. Any of these may be sources of essential amino acids. When proteins are heated they become denatured (unfolded) and change texture. In many cases, this causes the structure of the material to become softer or more friable – meat becomes cooked and is more friable and less flexible. In some cases, proteins can form more rigid structures, such as the coagulation of albumen in egg whites. The formation of a relatively rigid but flexible matrix from egg white provides an important component in baking cakes, and also underpins many desserts based on meringue.
Water
Main article: WaterCooking often involves water, and water-based liquids. These can be added in order to immerse the substances being cooked (this is typically done with water, stock or wine). Alternatively, the foods themselves can release water. A favorite method of adding flavor to dishes is to save the liquid for use in other recipes. Liquids are so important to cooking that the name of the cooking method used is often based on how the liquid is combined with the food, as in steaming, simmering, boiling, braising and blanching. Heating liquid in an open container results in rapidly increased evaporation, which concentrates the remaining flavor and ingredients; this is a critical component of both stewing and sauce making.
Vitamins and minerals
Main articles: Vitamin and Mineral (nutrient)Vitamins and minerals are required for normal metabolism; and what the body cannot manufacture itself must come from external sources. Vitamins come from several sources including fresh fruit and vegetables (Vitamin C), carrots, liver (Vitamin A), cereal bran, bread, liver (B vitamins), fish liver oil (Vitamin D) and fresh green vegetables (Vitamin K). Many minerals are also essential in small quantities including iron, calcium, magnesium, sodium chloride and sulfur; and in very small quantities copper, zinc and selenium. The micronutrients, minerals, and vitamins in fruit and vegetables may be destroyed or eluted by cooking. Vitamin C is especially prone to oxidation during cooking and may be completely destroyed by protracted cooking. The bioavailability of some vitamins such as thiamin, vitamin B6, niacin, folate, and carotenoids are increased with cooking by being freed from the food microstructure. Blanching or steaming vegetables is a way of minimizing vitamin and mineral loss in cooking.
Methods
See also: List of cooking techniquesThis section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (March 2017) (Learn how and when to remove this message) |
There are many methods of cooking, most of which have been known since antiquity. These include baking, roasting, frying, grilling, barbecuing, smoking, boiling, steaming and braising. A more recent innovation is microwaving. Various methods use differing levels of heat and moisture and vary in cooking time. The method chosen greatly affects the result. Some major hot cooking techniques include:
- Roasting
- Roasting – Barbecuing – Grilling/Broiling – Rotisserie – Searing
- Baking
- Baking – Baking Blind
- Boiling
- Boiling – Blanching – Braising – Coddling – Double steaming – Infusion – Poaching – Pressure cooking – Simmering – Smothering – Steaming – Steeping – Stewing – Stone boiling – Vacuum flask cooking
- Frying
- Fry – Air frying — Deep frying – Gentle frying – Hot salt frying – Hot sand frying – Pan frying – Pressure frying – Sautéing – Shallow frying – Stir frying – Vacuum frying
- Steaming
- Steaming works by boiling water continuously, causing it to vaporise into steam; the steam then carries heat to the nearby food, thus cooking the food. By many it is considered a healthy form of cooking, holding nutrients within the vegetable or meat being cooked.
- En papillote – The food is put into a pouch and then baked, allowing its own moisture to steam the food.
- Smoking
- Smoking is the process of flavoring, cooking, or preserving food by exposing it to smoke from burning or smoldering material, most often wood.
Health and safety
Indoor air pollution
Main article: Household air pollutionAs of 2021, over 2.6 billion people cook using open fires or inefficient stoves using kerosene, biomass, and coal as fuel. These cooking practices use fuels and technologies that produce high levels of household air pollution, causing 3.8 million premature deaths annually. Of these deaths, 27% are from pneumonia, 27% from ischaemic heart disease, 20% from chronic obstructive pulmonary disease, 18% from stroke, and 8% from lung cancer. Women and young children are disproportionately affected, since they spend the most time near the hearth.
Security while cooking
Hazards while cooking can include
- Unseen slippery surfaces (such as from oil stains, water droplets, or items that have fallen on the floor)
- Cuts; about a third of the US's estimated annual 400,000 knife injuries are kitchen-related.
- Burns or fires
To prevent those injuries there are protections such as cooking clothing, anti-slip shoes, fire extinguisher and more.
Food safety
Main article: Food safetyCooking can prevent many foodborne illnesses that would otherwise occur if raw food is consumed. When heat is used in the preparation of food, it can kill or inactivate harmful organisms, such as bacteria and viruses, as well as various parasites such as tapeworms and Toxoplasma gondii. Food poisoning and other illness from uncooked or poorly prepared food may be caused by bacteria such as pathogenic strains of Escherichia coli, Salmonella typhimurium and Campylobacter, viruses such as noroviruses, and protozoa such as Entamoeba histolytica. Bacteria, viruses and parasites may be introduced through salad, meat that is uncooked or done rare, and unboiled water.
The sterilizing effect of cooking depends on temperature, cooking time, and technique used. Some food spoilage bacteria such as Clostridium botulinum or Bacillus cereus can form spores that survive cooking or boiling, which then germinate and regrow after the food has cooled. This makes it unsafe to reheat cooked food more than once.
Cooking increases the digestibility of many foods which are inedible or poisonous when raw. For example, raw cereal grains are hard to digest, while kidney beans are toxic when raw or improperly cooked due to the presence of phytohaemagglutinin, which is inactivated by cooking for at least ten minutes at 100 °C (212 °F).
Food safety depends on the safe preparation, handling, and storage of food. Food spoilage bacteria proliferate in the "Danger zone" temperature range from 40 to 140 °F (4 to 60 °C); therefore, food should not be stored in this temperature range. Washing of hands and surfaces, especially when handling different meats, and keeping raw food separate from cooked food to avoid cross-contamination, are good practices in food preparation. Foods prepared on plastic cutting boards may be less likely to harbor bacteria than wooden ones. Washing and disinfecting cutting boards, especially after use with raw meat, poultry, or seafood, reduces the risk of contamination.
Effects on nutritional content of food
See also: Raw foodismProponents of raw foodism argue that cooking food increases the risk of some of the detrimental effects on food or health. They point out that during cooking of vegetables and fruit containing vitamin C, the vitamin elutes into the cooking water and becomes degraded through oxidation. Peeling vegetables can also substantially reduce the vitamin C content, especially in the case of potatoes where most vitamin C is in the skin. However, research has shown that in the specific case of carotenoids a greater proportion is absorbed from cooked vegetables than from raw vegetables.
Sulforaphane, a glucosinolate breakdown product, is present in vegetables such as broccoli, and is mostly destroyed when the vegetable is boiled. Although there has been some basic research on how sulforaphane might exert beneficial effects in vivo, there is no high-quality evidence for its efficacy against human diseases.
The United States Department of Agriculture has studied retention data for 16 vitamins, 8 minerals, and alcohol for approximately 290 foods across various cooking methods.
Carcinogens and AGEs
In a human epidemiological analysis by Richard Doll and Richard Peto in 1981, diet was estimated to cause a large percentage of cancers. Studies suggest that around 32% of cancer deaths may be avoidable by changes to the diet. Some of these cancers may be caused by carcinogens in food generated during the cooking process, although it is often difficult to identify the specific components in diet that serve to increase cancer risk.
Several studies published since 1990 indicate that cooking meat at high temperature creates heterocyclic amines (HCA's), which are thought to increase cancer risk in humans. Researchers at the National Cancer Institute 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 avoiding meat or eating meat raw may be the only ways to avoid HCA's in meat fully, the National Cancer Institute states that cooking meat below 212 °F (100 °C) creates "negligible amounts" of HCA's. Also, microwaving meat before cooking may reduce HCAs by 90% by reducing the time needed for the meat to be cooked at high heat. Nitrosamines are found in some food, and may be produced by some cooking processes from proteins or from nitrites used as food preservatives; cured meat such as bacon has been found to be carcinogenic, with links to colon cancer. Ascorbate, which is added to cured meat, however, reduces nitrosamine formation.
Baking, grilling or broiling food, especially starchy foods, until a toasted crust is formed generates significant concentrations of acrylamide. This discovery in 2002 led to international health concerns. Subsequent research has however found that it is not likely that the acrylamides in burnt or well-cooked food cause cancer in humans; Cancer Research UK categorizes the idea that burnt food causes cancer as a "myth".
Cooking food at high temperature may create advanced glycation end-products (AGEs) that are believed to be involved in a number of diseases, including diabetes, chronic kidney disease, cancer and cardiovascular diseases, as well as in ageing. AGEs are a group of compounds that are formed between reducing sugars and amino acids via Maillard reaction. These compounds impart colors, tastes and smells that are specific to these food, but may also be deleterious to health. Dry heat (e.g. in roasting or grilling) can significantly increase the production of AGEs, as well as food rich in animal protein and fats. The production of AGEs during cooking can be significantly reduced by cooking in water or moist heat, reducing the cooking times and temperatures, as well as by first marinating the meat in acidic ingredients such as lemon juice and vinegar.
Scientific aspects
Main article: Molecular gastronomyThe scientific study of cooking has become known as molecular gastronomy. This is a subdiscipline of food science concerning the physical and chemical transformations that occur during cooking.
Important contributions have been made by scientists, chefs and authors such as Hervé This (chemist), Nicholas Kurti (physicist), Peter Barham (physicist), Harold McGee (author), Shirley Corriher (biochemist, author), Robert Wolke (chemist, author.) It is different for the application of scientific knowledge to cooking, that is "molecular cooking" (for the technique) or "molecular cuisine" (for a culinary style), for which chefs such as Raymond Blanc, Philippe and Christian Conticini, Ferran Adria, Heston Blumenthal, Pierre Gagnaire (chef).
Chemical processes central to cooking include hydrolysis (in particular beta elimination of pectins, during the thermal treatment of plant tissues), pyrolysis, and glycation reactions wrongly named Maillard reactions.
Cooking foods with heat depends on many factors: the specific heat of an object, thermal conductivity, and (perhaps most significantly) the difference in temperature between the two objects. Thermal diffusivity is the combination of specific heat, conductivity and density that determines how long it will take for the food to reach a certain temperature.
Home-cooking and commercial cooking
Home cooking has traditionally been a process carried out informally in a home or around a communal fire, and can be enjoyed by all members of the family, although in many cultures women bear primary responsibility. Cooking is also often carried out outside of personal quarters, for example at restaurants, or schools. Bakeries were one of the earliest forms of cooking outside the home, and bakeries in the past often offered the cooking of pots of food provided by their customers as an additional service. In the present day, factory food preparation has become common, with many "ready-to-eat" as well as "ready-to-cook" foods being prepared and cooked in factories and home cooks using a mixture of scratch made, and factory made foods together to make a meal. The nutritional value of including more commercially prepared foods has been found to be inferior to home-made foods. Home-cooked meals tend to be healthier with fewer calories, and less saturated fat, cholesterol and sodium on a per calorie basis while providing more fiber, calcium, and iron. The ingredients are also directly sourced, so there is control over authenticity, taste, and nutritional value. The superior nutritional quality of home-cooking could therefore play a role in preventing chronic disease. Cohort studies following the elderly over 10 years show that adults who cook their own meals have significantly lower mortality, even when controlling for confounding variables.
"Home-cooking" may be associated with comfort food, and some commercially produced foods and restaurant meals are presented through advertising or packaging as having been "home-cooked", regardless of their actual origin. This trend began in the 1920s and is attributed to people in urban areas of the U.S. wanting homestyle food even though their schedules and smaller kitchens made cooking harder.
See also
Main article: Outline of food preparation- Carryover cooking
- Cookbook
- Cooker
- Cooking weights and measures
- Culinary arts
- Culinary profession
- Cooking school
- Dishwashing
- Food and cooking hygiene
- Food industry
- Food preservation
- Food writing
- Foodpairing
- Gourmet Museum and Library
- High altitude cooking
- International food terms
- List of cooking appliances
- List of cuisines
- List of films about cooking
- List of food preparation utensils
- List of ovens
- List of stoves
- Scented water
- Staple (cooking)
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External links
- Chisholm, Hugh, ed. (1911). "Cookery" . Encyclopædia Britannica. Vol. 7 (11th ed.). Cambridge University Press. pp. 74–76.
- Florence Nightingale (1861), Directions for Cooking by Troops, in Camp and Hospital
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