Gastric resection surgery, the scientific name is called sleeve gastrectomy. The principle of sleeve gastrectomy is as follows: 1) to limit absorption and food intake, because a large part of the stomach is cut off and the remaining stomach is smaller, resulting in less food intake, thus helping weight loss; 2) the deeper reason is that there are many metabolism-related factors on the cut stomach tissue, and after this surgery, the removal of this part of the stomach and the metabolism-related factors will have an effect on the body’s metabolism, thus improving metabolism. This surgery will have an effect on the body’s metabolism, thus improving the metabolism. The weight loss curve after metabolic surgery has a certain pattern. About 1 month after surgery, about 10% of body weight will be lost; 1-2 years after surgery, 30%-40% of body weight can be lost. If a patient weighing 100kg has the surgery, it can be maintained in the range of 60-70kg after 1 year. Whether the rebound after surgery depends on the patient’s future diet and lifestyle habits can be adhered to. If the patient is able to control the amount of food and maintain a good life, diet and exercise habits after slowly losing weight, rebound will not occur. The recovery period after gastric resection surgery varies from person to person. Usually 5-7 days after the surgery, if the patient can maintain nutrition by himself and does not need to rely on intravenous fluids and other treatments, he can be discharged home and take care of himself, and the patient can do the simple life by himself after discharge. Whether the patient can resume normal work after discharge from the hospital depends on the nature of the patient’s work. If the patient is a light worker, he or she can return to normal work after discharge; if the patient is a heavy worker, he or she should rest more after discharge and should not be put into work too early.