The reason why gastric diversion surgery is able to treat diabetes in one go and achieve clinical cure is that the unique feature of gastric diversion surgery is that it changes the physiological flow of food, which is accomplished through the steps of gastric blockage, gastrointestinal anastomosis, and enteroenteric anastomosis. After the surgery, the insulin resistance in the patient’s body is eliminated, and the way the food flows through after the surgery also promotes insulin secretion in the patient’s body, reduces apoptosis and proliferation of islet cells, restores islet function, and cures diabetes. Advantages of surgery: Advantage 1: Cure diabetes, normal blood sugar, patients get rid of lifelong medication and do not need to control diet. There are two main causes of diabetes: one is insulin resistance. The second is the failure of pancreatic islet function. After gastric diversion surgery, insulin resistance is gone, islet function is restored, and diabetes is gone. Advantage 2: Diabetic complications are recovered. While internal medicine cannot reverse the complications that have occurred in patients, after gastric diversion surgery, most patients gradually recover from diabetic complications such as numbness in hands and feet, retinopathy, diabetic foot, abnormal urine protein, and hypertension. Advantage 3: Avoid the occurrence of disabling and fatal conditions caused by diabetes. When diabetes develops to a serious level, it can pose a serious threat to a person’s life safety. After gastric diversion surgery, blood sugar is normal, complications no longer occur, and the danger of diabetes is gone. Advantage 4: Weight loss in obese patients and weight gain in thinner patients. Gastric diversion surgery can bring some unexpected effects to patients, very thin patients will gain weight after surgery, and very fat patients achieve satisfactory weight loss after surgery. Advantage 5: Reduce the financial burden of the patient. The relative cost is not high, which is the obvious advantage of gastric diversion surgery. According to the survey, most diabetic patients who have been ill for more than 5 years will develop various complications, and the cost of treating these complications is very high. For diabetic patients, a single surgical treatment, complications no longer appear and the financial burden is reduced. Advantage 6: Gastric diversion surgery has low risk and fast recovery after surgery. The surgery is easy and quick, with little trauma, quick recovery and no recurrence, and you can eat in 3 days after the surgery and be discharged in a week. Post-operative diet and nutrient absorption are basically unaffected. Indications 1, obesity with coexisting type 2 diabetes; 2, non-obese patients with type 2 diabetes; 3, patients with obesity combined with type 2 diabetes with complications; 4, islet function is in compensatory phase (islet function is not less than 30% of normal value); 5, age ≤ 65 years (not absolute, mainly based on the general condition of the body and the residual function of the islet). Contraindications 1.Patients with advanced diabetic islet failure, autoimmune diabetes mellitus (LADA); 2.Serious organic diseases (coronary heart disease, cerebral infarction, renal failure, heart failure, etc.) who cannot tolerate surgery; 3.Medium to severe diabetic gastroparesis; 4.Age >65 years old (not absolute, mainly according to the general physical condition and residual islet function).