The effectiveness of gastric reduction and weight loss is generally based on the patient’s own repair ability of the stomach wall and the adequacy of the extent of the stomach wall removed during surgery. First, if the extent of the stomach removed during surgery is sufficient and the patient’s own compensatory repair ability of the stomach wall is poor, the volume of the stomach will be significantly smaller after surgery than before, and there will be no compensatory hyperplasia. Patients will experience loss of appetite, reduced eating and weight loss, thus achieving the purpose of weight loss. Second, if the scope of the patient’s intraoperative resection of the stomach is small, and the patient’s own compensatory hyperplasia of the stomach wall is strong. The compensatory hyperplasia of the patient’s stomach wall tissue after surgery does not significantly reduce the volume of the stomach and does not cause the patient to lose appetite and achieve the effect of weight loss.