# Weight cycling

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{{Short description|Cyclical loss and gain of weight}}
{{Human body weight}}
thumb|right|Yo-yo cycle
'''Weight cycling''', also known as '''yo-yo dieting''', is the repeated loss and gain of weight, resembling the up-down motion of a [yo-yo](/source/yo-yo). The temporary weight loss of yo-yo dieting is often caused by quick yet unsustainable success of strict diets. The dieter often gives up due to hunger or discomfort, and gains the weight back. The dieter then seeks to lose the regained weight, and the cycle begins again. Other individuals cycle weight deliberately in pursuit of [bodybuilding](/source/bodybuilding) or athletic goals. Weight cycling contributes to increased risk of later obesity, due to repeated signals being sent to the body signalling that it is in starvation mode; therefore it learns to store fat more readily, and increases the strain on vital organs, likely promoting cardiometabolic disease.<ref name=Miles>{{cite journal |last1=Miles-Chan |first1=Jennifer L. |last2=Isacco |first2=Laurie |title=Weight cycling practices in sport: A risk factor for later obesity? |journal=Obesity Reviews |date=2021 |volume=22 |issue=S2 |article-number=e13188 |doi=10.1111/obr.13188|pmid=33372395 |s2cid=229715170 |doi-access=free }}</ref><ref>{{cite journal |last1=Montani |first1=Jean-Pierre |last2=Schutz |first2=Yves |last3=Dulloo |first3=Abdul G. |date=2015 |title=Dieting and weight cycling as risk factors for cardiometabolic diseases: who is really at risk?: Weight cycling and cardiometabolic risks |url=https://onlinelibrary.wiley.com/doi/abs/10.1111/obr.12251 |journal=Obesity Reviews |language=en |volume=16 |pages=7–18 |doi=10.1111/obr.12251 |pmid=25614199 |s2cid=30821753|url-access=subscription }}</ref><ref>{{cite journal |last1=Mehta |first1=Tapan |last2=Smith |first2=Daniel L. |last3=Muhammad |first3=Josh |last4=Casazza |first4=Krista |date=2014 |title=Impact of weight cycling on risk of morbidity and mortality: Weight cycling and mortality risk |journal=Obesity Reviews |volume=15 |issue=11 |pages=870–881 |doi=10.1111/obr.12222 |pmc=4205264 |pmid=25263568}}</ref>

==Causes==
===Dieting===
The reasons for yo-yo dieting are varied but often include embarking upon a hypocaloric diet too extreme to maintain. At first the dieter may experience elation at the thought of [weight loss](/source/weight_loss) and pride in their self-control for resisting certain foods, e.g. junk food, desserts, and sweets. Over time, however, the limits imposed by such extreme diets cause effects such as [depression](/source/depression_(mood)) or [fatigue](/source/fatigue_(physical)) that make the diet impossible to sustain. Ultimately, the dieter reverts to their old eating [habit](/source/habituation)s, now with the added emotional effects of failing to lose weight by the restrictive diet. Such an emotional state leads many people to eating more than they would have before dieting, especially the 'forbidden' foods e.g. junk food, desserts, and sweets, causing them to rapidly regain weight.<ref>
{{cite journal
| author1 = Amigo, I.
| author2 = Fernandez, C.
| title = Effects of diets and their role in weight control
| journal = Psychology, Health & Medicine
| volume = 12
| issue = 3
| pages = 312–327
| date = 2007
| doi = 10.1080/13548500600621545
| pmid = 17510902
| s2cid = 19290926
| hdl = 10651/38811
| hdl-access = free
}}</ref>

===Sports===
In some sports where an athlete's weight is important, such as those that use [weight class](/source/weight_class)es or aesthetics, it is common for athletes to engage in weight cycling.<ref name="Miles" /> Weight cycling is common among competitive [combat sports](/source/combat_sports) athletes,<ref>{{cite journal |last1=Matthews |first1=Joseph J. |last2=Stanhope |first2=Edward N. |last3=Godwin |first3=Mark S. |last4=Holmes |first4=Matthew E.J. |last5=Artioli |first5=Guilherme G. |title=The Magnitude of Rapid Weight Loss and Rapid Weight Gain in Combat Sport Athletes Preparing for Competition: A Systematic Review |journal=International Journal of Sport Nutrition and Exercise Metabolism |date=2019 |volume=29 |issue=4 |pages=441–452 |doi=10.1123/ijsnem.2018-0165|pmid=30299200 |s2cid=52943060 |url=http://eprints.staffs.ac.uk/6082/3/Accepted_manuscript.pdf }}</ref> including minors.<ref>{{cite journal |last1=Lakicevic |first1=Nemanja |last2=Matthews |first2=Joseph J. |last3=Artioli |first3=Guilherme G. |last4=Paoli |first4=Antonio |last5=Roklicer |first5=Roberto |last6=Trivic |first6=Tatjana |last7=Bianco |first7=Antonino |last8=Drid |first8=Patrik |title=Patterns of weight cycling in youth Olympic combat sports: a systematic review |journal=Journal of Eating Disorders |date=2022 |volume=10 |issue=1 |page=75 |doi=10.1186/s40337-022-00595-w|pmid=35614520 |pmc=9131524 |s2cid=249049707 |doi-access=free }}</ref> In [bodybuilding](/source/bodybuilding) and strength sports, weight cycling is often used as a way to take advantage of the increased ability to gain muscle while in a caloric surplus <ref>{{cite journal |last1=Aragorn|first1=Alan A. |last2=Schoenfeld|first2=Brad. |title=Magnitude and Composition of the Energy Surplus for Maximizing Muscle Hypertrophy: Implications for Bodybuilding and Physique Athletes |journal=Strength and Conditioning Journal |date=2020 |volume=42 |issue=5 |pages=79–86 |doi=10.1519/SSC.0000000000000539 |s2cid=213376888 |url=https://journals.lww.com/nsca-scj/abstract/2020/10000/magnitude_and_composition_of_the_energy_surplus.9.aspx |url-access=subscription }}</ref> by cyclically going through periods of intentional weight gain, followed by a period of weight loss to prevent excessive body fat accumulation.

===Mechanism===
The process of regaining weight and especially body fat is further promoted by the high metabolic plasticity of skeletal muscle. The [Summermatter cycle](/source/Summermatter_cycle)<ref name="Summermatter">{{cite journal |first1=Serge |last1=Summermatter |last2=C. Handschin |date=November 2012 |title=PGC-1α and exercise in the control of body weight |journal=[International Journal of Obesity](/source/International_Journal_of_Obesity) |volume=36 |issue=11 |pages=1428–1435 |pmid=22290535 |doi=10.1038/ijo.2012.12 |url=https://www.researchgate.net/publication/221791957|doi-access=free }}</ref> explains how skeletal muscle persistently reduces energy expenditure during dieting. In addition, food restriction increases physical activity which further supports body weight loss initially. Such weight regain in the form of preferential catch-up-fat is well documented after weight loss due to malnutrition, cancer, septic shock or [AIDS](/source/HIV%2FAIDS) and thus constitutes a general phenomenon related to weight loss.<ref name="Summermatter" />

==Health effects==
Weight cycling might have negative health effects from repeated strain on the body.<ref name=Miles/>

A 2019 systematic review and meta-analysis found that "Body-weight fluctuation was associated with higher mortality due to all causes and [CVD](/source/cardiovascular_disease) and a higher morbidity of CVD and [hypertension](/source/hypertension)."<ref>{{cite journal |last1=Zou |first1=Huajie |last2=Yin |first2=Ping |last3=Liu |first3=Liegang |last4=Liu |first4=Wenhua |last5=Zhang |first5=Zeqing |last6=Yang |first6=Yan |last7=Li |first7=Wenjun |last8=Zong |first8=Qunchuan |last9=Yu |first9=Xuefeng |title=Body-Weight Fluctuation Was Associated With Increased Risk for Cardiovascular Disease, All-Cause and Cardiovascular Mortality: A Systematic Review and Meta-Analysis |journal=Frontiers in Endocrinology |date=2019 |volume=10 |article-number=728 |doi=10.3389/fendo.2019.00728|pmid=31787929 |pmc=6856014 |doi-access=free }}</ref>

A 2019 review found that self-reported weight cycling was correlated with an increased risk of endometrial cancer.<ref>{{cite journal |last1=Zhang |first1=Xiaochen |last2=Rhoades |first2=Jennifer |last3=Caan |first3=Bette J |last4=Cohn |first4=David E |last5=Salani |first5=Ritu |last6=Noria |first6=Sabrena |last7=Suarez |first7=Adrian A |last8=Paskett |first8=Electra D |last9=Felix |first9=Ashley S |title=Intentional weight loss, weight cycling, and endometrial cancer risk: a systematic review and meta-analysis |journal=  International Journal of Gynecological Cancer|date=2019 |volume=29 |issue=9 |pages=1361–1371 |doi=10.1136/ijgc-2019-000728|pmid=31451560 |pmc=6832748 }}</ref> Weight cycling is also correlated with [kidney cancer](/source/kidney_cancer), independently of whether the person is overweight.<ref>{{cite journal |last1=Lee |first1=Dong Hoon |last2=Keum |first2=NaNa |last3=Rezende |first3=Leandro F. M. |last4=Tabung |first4=Fred K. |last5=Hong |first5=SungEun |last6=Giovannucci |first6=Edward L. |title=Association between weight cycling and risk of kidney cancer: a prospective cohort study and meta-analysis of observational studies |journal=Cancer Causes & Control |date=2021 |volume=32 |issue=9 |pages=1029–1038 |doi=10.1007/s10552-021-01455-9|pmid=34089471 |s2cid=235346460 }}</ref>

A 2021 systematic review and meta-analysis found that "weight cycling was a strong independent predictor of new-onset [diabetes](/source/diabetes)".<ref>{{cite journal |last1=Zou |first1=Huajie |last2=Yin |first2=Ping |last3=Liu |first3=Liegang |last4=Duan |first4=Wu |last5=Li |first5=Pu |last6=Yang |first6=Yan |last7=Li |first7=Wenjun |last8=Zong |first8=Qunchuan |last9=Yu |first9=Xuefeng |title=Association between weight cycling and risk of developing diabetes in adults: A systematic review and meta-analysis |journal=Journal of Diabetes Investigation |date=2021 |volume=12 |issue=4 |pages=625–632 |doi=10.1111/jdi.13380|pmid=32745374 |pmc=8015818 |s2cid=225509897 |doi-access=free }}</ref>

Weight cycling is also associated with poorer mental health.<ref>{{cite book |last1=Hankey |first1=Catherine |title=Clinical Obesity in Adults and Children |date=2022 |publisher=Wiley |isbn=978-1-119-69527-1 |pages=306–313 |edition=1 |language=en |chapter=Weight Loss Maintenance and Weight Cycling}}</ref>

==See also==
* [Excess post-exercise oxygen consumption](/source/Excess_post-exercise_oxygen_consumption) (EPOC)
* [Fad diet](/source/Fad_diet)
* [Healthy diet](/source/Healthy_diet)
* [Peltzman effect](/source/Peltzman_effect)

==References==
{{reflist}}

Category:Diets
Category:Obesity

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Adapted from the Wikipedia article [Weight cycling](https://en.wikipedia.org/wiki/Weight_cycling) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Weight_cycling?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.