Why fast weight loss doesn't work?

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Fast weight loss. Why doesn't it work?
Fast weight loss only works in the short term. After completing the diet, the weight returns to its previous levels.
After an extreme restriction of the number of calories, a person, as a rule, returns to the previous eating habits, which initially led to the need to go on a diet.
During rapid weight loss, it is mainly not adipose tissue that is burned, but muscle mass and water. So after the normalization of nutrition, their volumes will gradually recover. The weight will return.
Doctors advise not to use restrictive diets, but to normalize the diet.