Diet is an important factor in fatty liver. Dietary polyunsaturated fatty acids and fructose can increase the risk of fatty liver, and lifestyle changes are important measures to prevent FLD. For patients who have developed FLD, the disease can be improved by diet modification, increased physical activity (at least 150 minutes of exercise per week), psychotherapy, and other medical interventions. In the diet to control the total amount of dietary calories, balanced diet: 1, low glycemic index, that is, eating 2 hours of blood sugar fluctuations of less than 55%, can eat more black bread, cereals, vegetables, etc.; 2, low calorie diet, caloric value of 800 kcal, protein energy supply of not less than 25%, like the diet treatment in the Mediterranean region, more favorable to calories do not reduce too much, appropriate reduction of 300 ~ 500 cal; 3. Low-fat diet, fat diet shall not be higher than 20% of daily energy intake, polyunsaturated fatty acids strictly controlled at less than 7%; 4, low-carbohydrate diet, carbohydrates shall not account for more than 55% of energy intake, preferably controlled at 35% to 55%; 5, in addition, the higher requirements for protein, encourage patients to eat more nuts, olive oil 35 to 45 g/day. If the diet control is adhered to for more than 2 years, the body mass can be reduced by 7% per year, the key biochemical and pathological examinations may be improved.