Control the diet, the total energy intake should be controlled at 1000- 1500kcal/ day, the fat intake should account for 25%-35% of the total energy, and the diet is rich in fruits, vegetables and dietary fiber; Lean meat and vegetable protein are used as sources of protein. There should be enough high-quality protein in the diet to lose weight. In addition to the necessary nutrition, it is also necessary to supplement the necessary vitamins, minerals and adequate water. We should also change our eating habits and chew slowly when eating, which can slow down the absorption of nutrients and control energy intake. The goal of diet control is to control the monthly weight loss at about 0.5 ~ 1 kg, and lose 7-8% in 6 months. Obese patients had better make a strict diet plan under the guidance of a special dietitian.