Fat in a broad sense includes triglycerides, cholesterol and phospholipids, while fat in a narrow sense usually refers to triglycerides composed of glycerol and fatty acids, which exist in the subcutaneous tissues and around the abdominal organs of the human body, etc. The breakdown of fat is the result of biochemical metabolism. Fat is broken down into fatty acids and glycerol by lipase in the body. Glycerol is metabolized by the liver into glucose and then absorbed by the body, while fatty acids are dehydrogenated and oxidized to produce acetyl coenzyme A. Finally, carbon dioxide and water are excreted from the body through respiration. The fat metabolism process needs to be combined with albumin in the blood and transported through the blood circulation to reach all cells of the body for oxidation. Therefore, the so-called fat burning during exercise is actually due to the accelerated blood circulation, which accelerates the oxidation of fatty acids and then excretes them through respiration and urine, while sweating is not the main way of fat metabolism. In addition, the human body consumes energy through basal metabolism, various activities and the thermal effect of food. Basal metabolism is the minimum energy requirement to maintain life activities, if the daily calorie intake exceeds the energy consumption, the excessive energy will be stored in the body in the form of fat, which will gradually accumulate fat in the body and cause obesity, fatty liver, high blood lipid and other diseases. Therefore, to achieve the goal of fat loss, it is necessary to promote blood circulation throughout the body by exercising for a sufficient period of time and intensity, so that fat can be metabolized into carbon dioxide and water and then discharged from the body. Patients can choose jogging, dancing, badminton, swimming, hiking and other activities to promote fat metabolism according to their cardiopulmonary function and activity capacity. It should be noted that patients are not recommended to achieve fat loss through long-term starvation methods to avoid adverse reactions such as malnutrition and hypoglycemia. Once fat loss fails, it may also cause overeating and aggravate fat accumulation at the same time, which can cause diseases caused by overburdening the gastrointestinal tract.