Fatty liver, also known as intrahepatic steatosis, is called fatty liver when excessive fat accumulation in the hepatocytes is caused by various reasons and the fat content exceeds 5% (up to 40%-50%) of the liver weight (wet weight) or histologically exceeds 30% of the liver parenchyma. According to the etiology of fatty liver formation, fatty liver can be classified as follows: obese fatty liver, alcoholic fatty liver, hyperlipidemic fatty liver, post-hepatitis fatty liver, diabetic fatty liver, drug-related fatty liver, toxic fatty liver, pregnancy fatty liver, malnutrition fatty liver, hyperthyroid fatty liver, cortisol-increased fatty liver, inflammatory fatty liver, hereditary fatty liver, etc. The first thing about fatty liver treatment is to eliminate the cause of the disease, and finding and eliminating the cause is the fundamental method to treat fatty liver. For example, alcoholic fatty liver mainly lies in abstaining from alcohol, which damages the liver more than any kind of food, and when excessive alcohol enters the liver, the liver loses its function. Alcohol can cause acute damage to liver cells and a rise in transaminases, leading to fatty liver, alcoholic hepatitis and cirrhosis. Diabetic fatty liver lies in active treatment of diabetes; obese fatty liver lies in effective weight control; nutritional disorders fatty liver lies in adjusting the supply of nutrients. It is also important to avoid all kinds of drugs that are toxic to the liver. Most of the mild fatty liver can be improved after removing the causative factors. Secondly, adjusting the diet is an important part of the treatment of fatty liver. Especially in nutritional disorders, the diet needs to be high in protein and low in fat and sugar. Excessive intake of sugar will increase insulin secretion and promote the conversion of sugar into fat. Vegetable oils rich in unsaturated fatty acids should be chosen. Obese and overweight fatty liver patients should start with a moderate diet, with less high-calorie foods such as ice cream and candy, and more bean foods; less red meat and foods containing animal fat, especially not animal offal, which contains high cholesterol and is the enemy of fatty liver. Half of the obese people can have mild fatty liver, and the incidence of fatty liver in patients with severe obesity can be 61%-80% or more. The accumulation of fat in the liver is proportional to body weight, and the degree of fatty liver is reduced after weight control in obese patients. Conversely, weight gain will aggravate fatty liver. Reducing nutrient intake and controlling weight can improve fatty liver. Exercise should be carried out, walking 2 hours a day to achieve the purpose of fat loss.