Diet will rebound for the following two reasons: First, simply by dieting to reduce weight, without increasing physical exercise, after dieting for a period of time, the body will appear to reduce the basal metabolic rate, eating once you resume or maintain the same amount of food, the weight will also grow back, because the body after experiencing a period of starvation, the emergence of self-protection mechanism to prevent further weight loss, once the resumption of energy intake, rushed to Energy is converted into glycogen and fat accumulation, so the existing human beings can survive in the long history, after experiencing a famine, so in addition to dieting, but also to increase physical exercise, increase muscle mass and improve the body’s metabolic rate. Second, the diet is not scientific, for example, some people take no dinner diet or only eat vegetables, in addition to rebound will lead to malnutrition.