Metabolic correction (gastric diversion) surgical treatment of diabetes is no longer new. For eligible patients with type 2 diabetes, surgical procedures can not only achieve avoidance of medication and insulin blood glucose remains normal, but also the complications that have developed are reversed or cured to varying degrees. However, it is also important to emphasize here that surgery is a way and a method for patients to pay attention to the kind of results that can be achieved, which has a lot to do with personal habits after surgery. Before that it is necessary to understand the principle and the course of the surgery. Through surgery to reconstruct the gastrointestinal structure, intestinal anastomosis, gastrointestinal anastomosis, change the pathway of food flow through the gut, reduce the stimulation of hunger, reduce the amount of eating and absorption, regulate sugar and fat metabolism, correct the metabolic and endocrine balance, eliminate insulin resistance, and cure hyperinsulinemia, thus achieving both weight loss and sugar reduction. But here it is important to know that the surgery improves the patient’s desire to eat. Especially for obese patients, most of them have the habit of overeating. Although there is no more hunger after surgery, habitual eating cannot be excluded. If these bad eating habits are not corrected, binge eating blood sugar will still rise again. But this is generally the case, and experienced hospitals will develop a comprehensive post-operative diet management and rehabilitation program for each surgical patient to help achieve the best surgical benefit. As patients and family members also need to fully understand the surgery, if they do not have the determination and courage to start a new life, it is better not to do the surgical treatment.