It is the dream of many obese people to lose weight while lying down, but this kind of thing can only exist in the fantasy. In the conventional weight loss methods we are familiar with, whether it is diet or exercise consumption, it requires a certain amount of effort to get the weight loss effect, which is a normal weight loss process. As for weight loss surgery, many people think that after the surgery they will never have to worry about anything, is that really true? If I say: Yes. Would you believe it? Indeed, weight loss has never been an easy task, and bariatric surgery is actually not a single surgical procedure, but a whole set of systematic works including pre-operative, intra-operative and post-operative, which are interlinked and indispensable. The same is true for other procedures in minimally invasive surgery. For example, cholecystectomy, appendectomy, etc., the diseased part can be directly removed to achieve the therapeutic effect, and there is no special attention needed afterwards except for the recovery of the body. Unlike weight loss surgery, it is not a process of organ “lesion” but a process of adjusting the eating environment in the body. The two procedures we know as sleeve gastrectomy and gastric bypass involve restriction of food intake, food digestion, and nutrient absorption, although the modifications to the body are not the same. These related changes are closely related to the patient’s post-operative diet. To bring the effects of weight loss surgery into play, it is necessary to follow the dietary principles of the health manager after surgery and cooperate with the doctor’s recommendations to develop healthy and reasonable eating habits. This will reduce the chance of regain weight after surgery and make better use of the weight loss effect of the surgery.