The duration of fasting for gastric surgery should follow the doctor’s consent to start eating small amounts of food as permitted by medical advice. Due to the large reduction in the volume of the gastric cavity after gastrectomy, the diet should be based on the principles of small meals, light and easy to digest. At the beginning, you can eat a small amount of full-fluid, non-slag diet, such as a variety of broth, vegetable soup, fish soup, etc., at first 3-5ml / times, 3-5 times / day, gradually and slowly increase the amount of soup and the number of times, the number of times can be increased to 8-10 times / day, and then slowly transitioned to the water-boiled eggs, rice, noodles, soft rice, etc., and still eat little and eat more often. During this period, you can add a small amount of vegetables, fruit juice, while continuing to supplement a small amount of milk, meat, etc., but also appropriate supplement intestinal probiotics, such as bifidobacteria, yogurt and so on.