Gastrectomy surgery, also known as sleeve gastrectomy and gastric reduction surgery, is the most effective treatment for severe obesity with metabolic syndrome. Metabolic syndrome in obese people mainly includes: hyperinsulinemia, diabetes mellitus, polycystic ovary syndrome, irregular menstruation, infertility, sleep apnea syndrome, hypoxemia, fatty liver, etc. What are the precautions for gastrectomy surgery? The sleeve gastrectomy surgery makes the original enlarged stomach become like an intestinal tube. This reduces the volume of the stomach, resulting in less food entering and being digested and absorbed in the stomach. Most of the endocrine cells are also removed, and the appetite decreases after surgery, thus achieving weight reduction. Therefore, a low-calorie diet is given after surgery, but it is necessary to ensure adequate protein intake of about 85-120g/day; take 1 tablet/day of Sun Cun by mouth; supplement vitamins and appropriate amount of trace elements; add iron if necessary. Ensure adequate water intake, with daily fluid intake of more than 1500ml/day. Separate dry and thin food as much as possible, and separate water from solid food for more than 30 minutes. Do not use fatty meat, fried food, sweets, pastries, bread, drinks, candies and other foods. Sleeve gastrectomy is a minimally invasive surgery, which is less traumatic, quick recovery, high safety index, and most importantly, good results of surgical treatment; therefore, it is trusted by most patients. At present, I understand that there are only a few hospitals in China that can perform this surgery, because it requires a high level of medical equipment and surgeon’s skills. The sleeve gastrectomy surgery must be performed by experienced and skilled specialists, as well as advanced and complete medical equipment, in order to ensure the safety and effectiveness of the surgery. So what conditions can be met for gastrectomy surgery? The Chinese Guidelines for the Surgical Treatment of Obesity (2007) stipulate that those who meet any of the first three of the following conditions and have the fourth condition can perform weight loss surgery: 1, BMI ≥ 32kgm2 2, confirmed the emergence of obesity-related metabolic disorder syndrome, such as: hypertension, diabetes, fatty liver, sleep apnea syndrome, hyperlipidemia, etc., and the prediction of effective weight loss. 3, waist circumference: men ≥ 90cm, women ≥ 85cm; dyslipidemia. 4.Other: no alcohol or drug dependence, no serious mental and intellectual disorders; other weight loss methods are ineffective or intolerable; 16-65 years old; understanding and acceptance of surgery and post-operative lifestyle changes.