The reasons for the rapid rebound may be:
1, lose weight through drugs
2. Excessive dieting
After losing weight successfully through the above methods, most people will return to normal diet. In the process of excessive dieting, the body will react to dieting behavior, such as reducing basal metabolism (generally speaking, it is the calories consumed by a person who does not eat, drink or exercise all day). Then, after returning to a normal diet, because the body needs less calories than before losing weight, it will transform more fat into the body than before losing weight, resulting in a rapid rebound in weight, even heavier than before losing weight.