Losing weight belongs to a behavior pattern aimed at reducing excess fat and weight of human body. It refers to a phenomenon that drugs, diet, exercise, diet-slimming, Chinese medicine meridians and psychotherapy are used to reduce fat accumulation in the body, trying to correct the improper behavior caused by abnormal reaction of obese people, that is, to analyze the characteristics of eating behavior and exercise types of obese people by behavioral science, and on this basis, to reasonably correct the actions that lead to obesity.

All weight loss methods are directly or indirectly centered on calories, the effective index is to reduce calories, the health index is to protect basal metabolism, and the continuous index is satiety and satisfaction in appetite control.