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===Very low-calorie===
{{Main|Very low calorie diet}}
Very low calorie diets provide 200–800 calories per day, maintaining protein intake but limiting calories from both fat and carbohydrates.<ref>{{Cite journal |last1=Fock |first1=Kwong Ming |last2=Khoo |first2=Joan |date=2013 |title=Diet and exercise in management of obesity and overweight: Diet and exercise for weight management |journal=Journal of Gastroenterology and Hepatology |language=en |volume=28 |pages=59–63 |doi=10.1111/jgh.12407|pmid=24251706 |s2cid=28818676 |doi-access=free }}</ref> They subject the body to [[starvation]] and produce an average loss of {{convert|1.5|–|2.5|kg|lb|abbr=on}} per week.{{Citation needed|date=December 2021}} "2-4-6-8", a popular diet of this variety, follows a four-day cycle in which only 200 calories are consumed the first day, 400 the second day, 600 the third day, 800 the fourth day, and then totally [[fasting]], after which the cycle repeats.{{Citation needed|date=December 2021}} There is some evidence that these diets results in considerable weight loss.<ref name="Thom2017" /> These diets are not recommended for general use and should be reserved for the [[management of obesity]] as they are associated with [[Adverse effect (medicine)|adverse side effect]]s such as loss of lean muscle mass, increased risks of [[gout]], and [[electrolyte imbalance]]s. People attempting these diets must be monitored closely by a physician to prevent complications.<ref name=Strychar/>

The concept of crash dieting is to drastically reduce calories, using a very-low-calorie diet.<ref>{{cite web |title=How to diet |url=https://www.nhs.uk/live-well/healthy-weight/how-to-diet/ |website=nhs.uk |language=en |date=27 April 2018 |access-date=17 October 2019 |archive-date=22 November 2017 |archive-url=https://web.archive.org/web/20171122105610/https://www.nhs.uk/livewell/loseweight/Pages/how-to-diet.aspx |url-status=live }}</ref><ref>{{cite web |title=Take the test: Is an 800-calorie diet right for me? |url=https://www.bbc.co.uk/food/articles/crash_diet_test |website=BBC Food |language=en |access-date=19 October 2019 |archive-date=18 June 2022 |archive-url=https://web.archive.org/web/20220618145752/https://www.bbc.co.uk/food/articles/crash_diet_test |url-status=live }}</ref><ref>{{cite web |last1=Bonet |first1=Anna |title=Are crash diets ever a good idea for weight loss? |url=https://www.netdoctor.co.uk/healthy-eating/a25288668/are-crash-diets-bad-for-you/ |website=Netdoctor |date=28 November 2018 |quote='A crash diet is typically a very low-calorie diet, where you eat a very restrictively for a short period of time,' explains Registered Dietician, Helen Bond. |access-date=19 October 2019 |archive-date=7 July 2022 |archive-url=https://web.archive.org/web/20220707010239/https://www.netdoctor.co.uk/healthy-eating/a25288668/are-crash-diets-bad-for-you/ |url-status=live }}</ref><ref>{{cite web |title=Crash diets can cause transient deterioration in heart function |url=https://www.sciencedaily.com/releases/2018/02/180202123836.htm |website=ScienceDaily |language=en |date=2018-02-02 |access-date=17 August 2019 |archive-date=29 April 2022 |archive-url=https://web.archive.org/web/20220429184602/https://www.sciencedaily.com/releases/2018/02/180202123836.htm |url-status=live }}</ref> Crash dieting can be highly dangerous because it can cause various kind of issues for the human body. Crash dieting can produce weight loss but without professional supervision all along, the extreme reduction in calories and potential unbalance in the diet's composition can lead to detrimental effects, including sudden death.<ref>{{cite web |title=How crash diets harm your health - CNN.com |url=http://edition.cnn.com/2010/HEALTH/04/20/crash.diets.harm.health/index.html |website=www.cnn.com |language=en |access-date=17 August 2019 |archive-date=19 May 2022 |archive-url=https://web.archive.org/web/20220519105134/http://edition.cnn.com/2010/HEALTH/04/20/crash.diets.harm.health/index.html |url-status=live }}</ref>