Many people may not realize that diabetes and obesity often go hand in hand. In China, there are about 113.9 million adults with diabetes, and more than 74 million of them are overweight or obese, accounting for more than 60%. It is clear that obesity is an important factor in causing type 2 diabetes. As far as traditional internal medicine is concerned, diabetes cannot be cured and needs to be maintained by medication. At the advanced stage, many diabetic patients also face various complications. This dilemma has only taken a new turn with the development of bariatric surgery. Bariatric surgery, as the name implies, is a type of weight loss surgery that has been developed for more than 70 years. With the way to do surgery to lose weight, this surgery is not only effective, but also effective in preventing rebound, according to statistics, the regain rate of weight loss surgery is only about 5% to 10%. This is certainly a very good choice for those fat people. The principle of weight loss surgery is very simple, it is through the transformation of the human gastrointestinal tract structure to achieve the inhibition of eating and absorption effect, so as to reduce weight. In the case of the commonly used gastric bypass surgery, a small gastric bursa is created in the upper part of the stomach to limit food intake, while the distal jejunum is anastomosed with the bursa so that the food bypasses the large part of the stomach, duodenum and the first jejunum, thus greatly controlling food intake and absorption. The original purpose of bariatric surgery was to help patients with severe obesity for whom traditional weight loss methods were no longer effective, but it has since been clinically discovered that bariatric surgery can be used not only to lose weight but also to effectively treat type 2 diabetes. As we know from the previous introduction, weight loss surgery is performed by changing the structure of the human gastrointestinal tract to reduce food intake and absorption to achieve weight loss, and this change not only reduces energy intake, but also improves sugar metabolism and lowers blood sugar. This not only reduces energy intake, but also improves sugar metabolism and lowers blood glucose, allowing diabetics to maintain a normal blood glucose level. The aforementioned gastric bypass surgery is the “gold standard” procedure for the treatment of diabetes, and it can be used for all type 2 diabetes. The emergence of bariatric surgery has undoubtedly brought a new direction to the treatment of diabetes, and it is believed that this method will be more widely used in the future, bringing more diabetic patients the gospel.