Nowadays, the number of obese and diabetic patients is increasing, and in addition to the traditional conservative medical treatment, a number of people are choosing to improve their obesity symptoms and treat their diabetes through bariatric surgery. Bariatric surgery has been developed for 60 years and is a very mature technique. Currently, the medical community has accepted bariatric surgery as an important treatment to address obesity. Gastric reduction surgery reduces the volume of the stomach to reduce the secretion of the gastric hunger hormone (ghrelin), dramatically reducing hunger to lose weight. The surgery is simpler, safer and has a lower percentage of complications, while it does not affect the absorption of food and does not have sequelae such as calcium, iron, vitamins, anemia and osteoporosis in the long run, and the surgery can reduce excess body weight. In addition to choosing a safe and reliable hospital and a surgeon experienced in surgery, post-surgery health management is also important for the post-operative results. Weight reduction and metabolic surgery is a long-term systematic project, and to achieve the best weight and sugar reduction results, professional pre-operative evaluation and education, standardized and individualized surgery, and long-term post-operative health management and nutritional guidance should be guaranteed. The organic combination of the three is the best way to ensure long-term effectiveness and avoid the risk of nutritional deficiency. In this process, the joint participation of specialist, health manager and nutritionist is required, one cannot be missing.