The amount and type of food, the interval and frequency of food intake should be adjusted according to the tolerance of diet and gastrointestinal capacity. In the early postoperative period, nutrition is usually supplied by special means, such as intravenous nutrition or enteral nutrition. After 3-4 days of postoperative exhaustion and recovery of gastrointestinal function, food can be eaten gradually, usually according to the following principles: I. Postoperative 1. It is appropriate to start with 8-10 meals per day, gradually change to 5-6 meals about 1 month after surgery, and gradually change to 3-4 meals after 3-6 months. There is no absolute standard because the situation of each person is different, and the amount and interval of each meal should be decided mainly according to the discomfort after eating. The main food and side dishes should be thin, soft and easy to digest. As patients are not used to the state of small stomach or no stomach in the short term, it is often easy to eat and drink according to preoperative habits, resulting in bloating, gastric emptying disorders, and even anastomotic dehiscence, so do not overeat. 2, eat more protein-rich food: the early postoperative period should be in accordance with the order of dregs-free clear liquid food, less dregs liquid food, semi-liquid food, soft food, general food. Liquid diet with rice soup, egg soup, vegetable soup, lotus root powder, enteral nutrition preparation, milk, protein powder is appropriate. Semi-liquid diet should be chosen with high protein, high calorie, high vitamin, low fat, fresh and easy to digest food. The best source of animal protein is fish, but also egg custard and yogurt; vegetable protein is better than tofu. After entering the universal diet, you should eat more vegetables and fruits. 3, less sweets and fat: should avoid the intake of large amounts of too sweet food to cause discomfort. Fat energy supply does not exceed 35% of the total energy, less animal fat, should eat easily digested and absorbed fat, such as vegetable oil, cream, egg yolk, etc. 4.Food taboos: (1) avoid cold and hot food; (2) avoid spicy and stimulating condiments; (3) avoid drinking spirits, strong tea and other stimulating drinks; (4) avoid too rough food, such as fried food. 5.Preventing anemia: After subtotal resection of gastric cancer, especially after total gastrectomy, iron deficiency anemia is prone to occur, therefore, lean meat, fish, shrimp, animal blood, animal liver, and foods rich in protein and iron such as dates, green leafy vegetables, sesame paste, etc. can be consumed appropriately. 6, chew slowly: post-operative gastric grinding function is weakened, for the coarse and indigestible food, should chew slowly. Diet during chemotherapy Enhancement of nutrition can make cancer cells grow, and the actively growing cancer cells are more easily damaged by radiotherapy, so the nutritional intake should be increased during radiotherapy, and it is appropriate to supplement high protein food. If you lose appetite, nausea and vomiting, you can increase appetizing foods, such as hawthorn, radish, vanilla, Chen Pi, etc. Eat less and more meals. Change recipes and cooking methods. Food should be more cooked and rotten to facilitate digestion and absorption. Eat more raw cold vegetables and fruits with high vitamin content. Those who have difficulty eating should be given enteral nutrition or intravenous nutritional support.