Type 2 diabetes accounts for 85-90% of the total number of diabetes mellitus, and its prevalence is increasing year by year, with more than 200 million patients worldwide, and its complications are fatal and disabling, seriously threatening the health and lives of patients. However, all the above-mentioned medical treatments cannot ensure that the patient’s blood sugar returns to normal level and cannot prevent the emergence and further aggravation of various diabetic complications. In the early 1980s, the medical community unexpectedly discovered that a type of surgery for weight loss could “incidentally” cure type 2 diabetes. The international medical community spared no effort in researching the reasons (mechanism of action) for this unorthodox procedure, and although it was only a bunch of conjecture at the time, the treatment of type 2 diabetes through bariatric surgery such as gastric diversion GBP has shown considerable promise and is gradually being applied in the clinical setting. Gastric diversion surgery: The cause of diabetes is twofold. First, K cells distributed in the gastrointestinal tract are stimulated by food to secrete insulin resistance factors, causing the body to develop insulin resistance. Secondly, the islet cells are damaged by insulin resistance factor and apoptosis. The reason why gastric diversion surgery can treat diabetes and achieve clinical cure in one go 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 the body 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. In addition to the normalization of blood sugar, the patient recovered well from a series of accompanying complications. For example, retinopathy, diabetic nephropathy, diabetic dermatitis, diabetic sexual dysfunction, hypertension, hyperlipidemia, etc. were gradually cured. The occurrence of serious complications has been eliminated, and the occurrence of disabling and fatal cases has been avoided.