Our expert says:
Fasting is usually undertaken for religious reasons or when patients are so obese that they are treated in a hospital, something that is not very usual, esp nowadays when bariatric surgery is used for pronounced obesity. Fasting to lose weight will of course lead to weightloss, but it will also tend to decrease muscle mass (which is not desirable) and lead to complications like deficiencies, etc. Fasting for a day every now and then will probably not have an dramatic effect on health provided you remain hydrated, but it will also not cause permanent weightloss.
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