The fat content in normal human liver is one percent of the total weight of the liver. Fatty liver occurs when the fat content exceeds one tenth of the weight of the liver or when more than half of the hepatocytes are histologically steatotic. When fat accumulates excessively in the liver for a long period of time, the blood and oxygen supply to the liver and its own metabolism are continuously affected, causing massive swelling, inflammatory infiltration and deformation and necrosis of hepatocytes, and once the liver has fibroplasia and pseudobullet formation, cirrhosis. Although fatty liver is a benign lesion, if not properly prevented and treated, cirrhosis can occur in about one quarter of patients. Once it progresses to cirrhosis, it signals the possibility of ascites, gastrointestinal hemorrhage or liver failure or even death. If diagnosed and treated early, the development of fatty liver can be completely controlled and reversed. Self-prevention regarding fatty liver is mainly about correcting poor lifestyle, exercising in moderation and controlling diet to get rid of the cause of the disease. The best way to reduce fat is to exercise and control the diet. For those who sit in the office all day, even if you can insist on walking a little more or climbing the stairs once more every day, it will be beneficial to prevent fatty liver. When controlling the diet alone, the body’s basal metabolic rate decreases and energy expenditure decreases, supplemented by physical exercise which increases energy expenditure. At the same time, it can also reduce the body’s protein loss caused by a purely low-calorie diet, forcing more fat decomposition, so that the body’s weight composition ratio of beneficial changes in weight loss while enhancing physical fitness, and help improve insulin resistance, control blood sugar, reduce blood lipids and blood pressure, promote the fatty deposits in the liver to subside and improve liver function. However, experts warn that too much exercise can be a metabolic disruptor for patients with chronic wasting diseases such as malnutrition, protein deficiency, hyperthyroidism and tuberculosis, as well as those with fatty liver caused by drugs and toxins, which is not conducive to recovery from the disease.