A number of people suffer from fatty liver under unhealthy lifestyle and unhealthy diet. It has been found that obese, especially abdominal obese people are prone to fatty liver because the fat cells around the abdomen are more sensitive to stimulation, resulting in an increase in fatty acids delivered to the liver by the abdominal fat cells. In addition, obese people are mostly combined with hypoglycemic tolerance and hyperinsulinemia, which play an important role in the pathogenesis of obese fatty liver. Because the surrounding tissues are less sensitive to insulin, the function of muscle uptake of glucose also decreases, so that glucose cannot be fully utilized, and excess glucose constantly stimulates pancreatic islet cells to secrete a large amount of insulin, and the liver, under the action of pancreatic islets, uses glucose and The liver, under the action of the pancreas, synthesizes a large amount of triacylglycerol from glucose and fatty acids, and endogenous hyperlipidemia and fatty liver occur. The degree of fat accumulation in the liver is directly proportional to body weight. 30% to 50% of obese people have fatty liver in combination, and the rate of fatty liver lesions in severely obese people is as high as 61% to 94%. When the weight of obese people is controlled, their fatty infiltration is also reduced or disappears. For this kind of obese fatty liver, if the weight is already a large base obesity, ordinary weight loss methods are hardly effective, and the more effective way to improve fatty liver is currently recommended to reduce weight through gastric reduction surgery. The data of weight reduction surgery performed for more than 1,500+ patients in our hospital for more than 10 years shows that fat people who have had the surgery will lose more than 75% of their extra weight, and their metabolic problems will be relieved and cured to different degrees after the surgery, especially for fatty liver. This is why metabolic weight loss surgery is recommended as an effective method of weight regulation, and weight reduction through surgery is also internationally recognized as a safe and efficient method. Of course, there are strict conditions for the surgery and a pre-operative examination and evaluation must be done first if you want to have the surgery. The preoperative examination and evaluation will determine the best surgical plan and parameters for the procedure once the patient is able to undergo surgery.