Adjusting the diet structure is an important method to treat fatty liver, and an important measure to prevent and control the progress of fatty liver. The principles of fatty liver diet treatment are mainly appropriate caloric intake, reasonable distribution of the three major nutritional elements and taking into account their quality, appropriate supplementation of vitamins, minerals and dietary fiber, and abstinence from smoking and alcohol. Proper adjustment of daily caloric intake, scientific distribution of various nutritional elements, and adherence to a reasonable dietary regime, such as lean meat, fish, egg whites and fresh vegetables rich in lipophilic substances, can help promote the elimination of fat in the liver, and high-fiber foods can help increase satiety and control blood sugar and blood lipids, which is especially important for fatty liver with excess nutrients. It is worth noting that fatty liver patients should still have a moderate amount of fat in their diet and pay attention to the appropriate control of sugar intake, because moderate fat intake is necessary for human health, even if the intake of fat-free food, the body can still use sugar and amino acid predecessor substances to synthesize fat; while the intake of too much sugar, especially sweet food rich in monosaccharides or disaccharides, can increase the secretion of insulin to promote the conversion of sugar into fat. For alcoholic liver disease, fatty liver caused by malnutrition and protein-calorie malnutrition, and fatty liver cirrhosis, the nutritional support therapy of supplementing sufficient high-quality protein and calories should be especially emphasized. Insufficient protein intake can intensify fat deposition in the liver, while a high-protein diet can increase the synthesis of apolipoproteins, especially VLDL, which is conducive to the smooth transport of lipids out of the liver, reduce fatty liver, and facilitate Therefore, the daily protein intake of fatty liver patients should not be less than 60g, and vegetarians should not have less than 80g/d of vegetable protein, but the protein intake of patients with diabetic fatty liver and nephropathy should not be too much. In short, different dietary treatment plans should be formulated according to different etiologies and conditions of patients, and timely adjustments should be made when the conditions change.