Low-calorie diet should be given after operation, but the intake of protein should be ensured to be around 85- 1.20g/ day; Oral shengcun 1 tablet/day; Supplementing vitamins and trace elements; Add iron if necessary. Ensure adequate drinking water, and the daily liquid intake is greater than 1500ml/ day. When conditions permit, dry food and thin food should be separated as much as possible, and the interval between drinking water and eating solid food should be more than 30min. Do not eat fat, fried food, sweets, cakes, bread, drinks, sugar stains and other foods.