Every person has a root cause of morbidity, and the root cause of obesity lies in the stomach. Obese patients have a common feature in common: the stomach is particularly large, so the amount of food is surprisingly large. So the root cause of obesity has to start from the stomach. At present, there are many kinds of surgery to treat obesity, such as: sleeve gastrectomy, gastric bypass surgery, gastric reduction and intestinal bypass surgery, etc. Sleeve gastrectomy: Sleeve gastrectomy is a hot topic in bariatric surgery, and its popularity has increased significantly. Because the surgery will cut off 80% of the stomach volume, it will not only reduce the amount of food eaten, but also reduce the amount of Ghrelin, the hormone that stimulates appetite, so the appetite will also be reduced. Within two years after surgery, you can lose about 10-15 BMI or 70% of your excess weight. For those who have a high BMI (over 40) and have difficulty reducing their appetite, sleeve gastric surgery can achieve ideal weight loss. The results of sleeve gastric surgery fall somewhere between gastric bypass and gastric banding, and the safety of the procedure falls somewhere in between, making it a fairly “middle of the road” procedure. If compared to gastric bypass, sleeve gastric surgery does not involve intestinal reconstruction, so there are no long-term sequelae such as anemia and osteoporosis due to vitamin deficiencies. Although this procedure is very safe, there are certain things to keep in mind. First of all, the patient’s eating habits may change considerably after surgery, and if he eats too much or too fast, nausea and vomiting may result. Some patients may need a longer period of time to change their eating habits. The diet should be mainly liquid for 2 weeks after surgery, with soft meals for 2 to 4 weeks and then solid foods can be added gradually. Sometimes it may take 3-6 months to get used to it.