The cause of excessive insulin secretion is mainly the result of insulin resistance produced by obesity. Obese patients with excessive fat content are prone to insulin resistance, so that insulin cannot play a corresponding role in lowering blood glucose. In order to keep blood sugar normal, the body will promote insulin secretion by pancreatic beta cells, resulting in hyperinsulinemia. When excessive insulin still cannot control blood sugar, diabetes will appear, so obesity and insulin resistance are important reasons for the occurrence of diabetes. Obese patients are also prone to hypertension, hyperlipidemia, obesity-related nephropathy, etc. Therefore, in order to control weight, obese patients should do the following: First, strictly control the diet, control the total caloric intake of a day, advocate eating foods rich in dietary fiber to enhance satiety, and avoid high-calorie, high-carbohydrate, high-fat diet. Exercise can improve insulin resistance and increase insulin sensitivity, and it can also increase total calorie consumption, which is beneficial to weight control. Third, if diet and exercise still cannot control weight, weight loss drugs or drugs to improve insulin resistance, such as metformin, can be given as treatment.