Many people suffer from rebound when they lose weight, especially after several rounds of repeated weight loss journey. And when the emergence of gastric reduction surgery, its long-term effectiveness is recognized by many friends, so how exactly does weight loss surgery solve the problem of weight loss rebound? How does weight loss surgery work? Let’s start with sleeve gastrectomy surgery, which is often referred to as gastric reduction surgery, also called gastric resection surgery. Its principle is to use laparoscopy to cut out vertically in the direction of the large curvature of the stomach, preserving 2-6 cm of the gastric sinus above the pylorus, so that the stomach forms a “banana-shaped” small gastric sac of about 150 cc, with a volume of about 60-80 ml, which can hold about 4-5 ounces of food. The advantage of this procedure is that it does not require the placement of foreign objects in the body and it is very effective in weight loss. Because the surgery will cut off 80% of the stomach volume, in addition to reducing the amount of food eaten, it will change the gastrointestinal hormones and therefore reduce the appetite. Within two years after surgery, about 10-15 BMI or 70% of excess weight can be lost. For those patients with severe obesity whose BMI is over 40 and who have difficulty in reducing food intake, gastrectomy can achieve ideal weight loss. We should understand that bariatric surgery is a kind of gastrointestinal surgery, which can achieve weight loss by adjusting the body’s gastrointestinal structure and limiting the body’s food intake and absorption. So how does it solve the problem of “re-fat” and achieve long-term effectiveness? In fact, our bodies have a “body fat adjustment point” that varies from person to person. The adjustment point is like a thermostat in the central heating of a house, which is automatically responsible for regulating the temperature. When it senses that the room temperature is lower than the set temperature, it automatically starts to adjust the temperature. When the room temperature reaches the set temperature, the heating is automatically terminated. Due to the presence of the body fat regulating point, short-term weight gain or loss will be automatically compensated and the weight tends to return to the regulating point level. Therefore, if you rely on lifestyle, dietary changes, or pharmaceutical interventions, you will have little effect on the change of the adjustment point; if you rely solely on dieting, you will not be able to reduce the adjustment point in your body, which leads to the result of “regained weight”. After the surgery, through changing the structure of the gastrointestinal tract, the normal body fat adjustment point can be adjusted, and when the adjustment point decreases after the surgery, the problem of weight loss rebound can be solved fundamentally.