Since its discovery, bariatric surgery has evolved over the past 70 years to become a mature, routine, and safe treatment of choice for patients with severe obesity. The medical community has identified bariatric surgery as the only long-term effective treatment for obesity. By addressing the root causes of food intake and nutrient absorption, bariatric surgery not only reduces weight, but also treats a variety of metabolic diseases associated with obesity. On average, you can lose 60-80% of your body’s excess weight in a year’s time. Generally, after a period of surgery, the gastrointestinal tract will return to its normal range of absorption capacity, and by then 80% of the excess flab has been lost, allowing you to maintain an ideal weight range for a long time. Bariatric surgery is not only effective for long-term weight loss, but also reduces the risk of 13 types of malignant tumors, effectively treats a variety of obesity-associated diseases such as hypertension and diabetes, and extends life expectancy by an average of seven years after surgery compared to obese people who have not undergone bariatric surgery. Gastric bypass surgery is the “gold standard” procedure for weight loss and diabetes. It is performed by reconstructing the digestive tract, creating a small gastric bursa in the upper part of the stomach to limit food intake, and by anastomosing the distal jejunum to the bursa, allowing food to bypass the large part of the stomach, duodenum, and first jejunum, thus greatly controlling food intake and absorption, with the best risk-benefit ratio.