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Revision as of 18:35, 28 June 2017

It has been suggested that this article be merged into Intermittent fasting. (Discuss) Proposed since June 2017.

The 5:2 diet, or fast diet, is a fad diet which stipulates calorie restriction for two days a week and eating an unmoderated amount for the other five days. A form of intermittent fasting, it originated and became popular in the UK, then spread to the rest of Europe and to the US.

Proponents of the diet claim it causes weight loss and has some beneficial effects on health; however as with other fad diets these claims are not supported by high-quality evidence.

Description

The diet specifies a low calorie consumption (sometimes described as "fasting") for two days a week but allows unmoderated eating for the other five days. Men may eat 600 calories (2,500 kJ) on fasting days, and women 500 calories (2,100 kJ).

Proponents say that fasting for only two days a week may be easier for dieters to comply with than daily calorie restriction.

Evidence

In general there is a lack of research evidence on intermittent fasting, and there is only limited evidence of the 5:2 diet's safety and effectiveness.

According to NHS Choices, people considering the diet should first consult a physician, as fasting can sometimes be unsafe.

In the UK, the tabloid press has reported on research claiming the 5:2 diet could reduce the risk of breast cancer; however according to the NHS the evidence being considered formed an inadequate basis for making such statements.

Reception

The diet became popular in the UK after the BBC2 television Horizon documentary Eat, Fast and Live Longer written and presented by Michael Mosley was broadcast on 6 August 2012 and many books on the diet quickly became bestsellers, soon after.

Dieticians and the UK National Health Service have categorized it as a fad diet.

A news item in the Canadian Medical Association Journal expressed concern that promotional material for the diet showed people eating high-calorie food such as hamburgers and chips, and that this could encourage binge eating since the implication was that "if you fast two days a week, you can devour as much junk as your gullet can swallow during the remaining five days".

References

  1. ^ Emma Young, New Scientist (2 January 2013). "Hunger games: The new science of fasting". Thomasville Times Enterprise. Retrieved 3 January 2013. ...I am allowed to eat whatever I want on the five non-fast days.
  2. ^ Mosley, Michael. "The 5:2 diet: can it help you lose weight and live longer?". The Telegraph. Retrieved 11 September 2012. With this regimen you eat what you want five days a week... {{cite news}}: Italic or bold markup not allowed in: |newspaper= (help)
  3. ^ "How to diet". Live Well - NHS Choices. UK National Health Service. 9 December 2011. Retrieved 10 February 2014.
  4. Emma Young, New Scientist (2 January 2013). "Hunger games: The new science of fasting". Thomasville Times Enterprise. Retrieved 3 January 2013.
  5. ^ "The UK's Hot New 5:2 Diet Craze Hits The U.S. - Weight Loss Miracle?". Forbes. 17 May 2013. Retrieved 10 February 2014.
  6. ^ "News analysis: Does the 5:2 intermittent fasting diet work?". Health News. UK National Health Service - NHS Choices. May 2013. Retrieved 23 November 2016. Champions of the 5:2 diet claim that other than helping people lose weight, 5:2 diet can bring other significant health benefits ... Studied cited in analysis: Int J Obes (Lond), 2010 Proceedings of the Nutrition Society, 2012
  7. ^ Mosley, Michael. "The 5:2 diet: can it help you lose weight and live longer?". The Telegraph. Retrieved 11 September 2012. {{cite news}}: Italic or bold markup not allowed in: |newspaper= (help)
  8. "The 5:2 diet - Can starving yourself twice a week make you live longer?". Yahoo! Lifestyle. 7 September 2012. Archived from the original on 10 September 2012. Retrieved 11 September 2012. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  9. "Could 5:2 diet play a role in preventing breast cancer?". NHS Choices. 17 June 2016.
  10. Mosley, Michael (5 September 2012). "Eat, Fast & Live Longer". Horizon. Episode 49x03. BBC. 2. Retrieved 10 February 2014. {{cite episode}}: Unknown parameter |serieslink= ignored (|series-link= suggested) (help)
  11. Stone, Philip (22 February 2013). "Public appetite for fasting grows: four intermittent fasting titles earn bestseller status; Mary Berry beats Paul Hollywood in a baking battle; and children's sales slump due to a calendar quirk". The Bookseller: 17.
  12. Trueland J (2013). "Fast and effective?". Nursing Standard (Pictorial). 28 (16): 26–27. doi:10.7748/ns2013.12.28.16.26.s28.
  13. Healy A (11 June 2013). "Dietitians warn against fad diets". Irish Times.
  14. Collier R (2013). "Intermittent fasting: the science of going without". CMAJ. 185 (9): E363–4. doi:10.1503/cmaj.109-4451. PMC 3680567. PMID 23569168.

Further reading

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