Gastric bypass surgery, the “gold standard” procedure for weight loss and diabetes, is the obvious choice for many obese patients with type 2 diabetes. Compared to lifelong treatment with medications, surgery is more determined to treat the disease at its source. In fact, most of the sugar inside the human body comes from the daily diet. Some people think that if they don’t eat sugar, they won’t suffer from diabetes, but they don’t know that the food they eat basically contains sugar, just the amount. In general, obese people eat more than normal people, and because of this the amount of sugar absorbed every day is also higher than normal people, and over time will suffer from diabetes. Reduce the weight of the patient and reduce fat cells. One of the reasons for the worsening of diabetes is the decrease of insulin function in the body, and the presence of a large number of fat cells directly affects the function of insulin to break down sugar, so the condition of diabetes becomes more and more serious day by day. After the surgery, the function of the gastrointestinal tract can be rebuilt, thus changing the secretion of hormones in the intestine-islet axis. Once the insulin function is functioning normally, the internal blood sugar balance can be well maintained by breaking down the excessive sugar in the body in a timely manner. Gastric bypass surgery alters the intestinal flora, directly lowering blood sugar while insulin is recovering and not returning to its optimal state. Creating a good recovery environment inside the body after surgery. Diabetes can eat away at a person’s body step by step, which is a systemic chronic disease, and diabetes surgery can restore a person’s body step by step according to the regulation of the system.