Patients with malignant tumor have poor tolerance to chemotherapy, and side effects such as nausea and vomiting further reduce the compliance of chemotherapy. The daily energy of patients undergoing radiotherapy and chemotherapy should be at least 10460 ~ 12552 kJ, and the protein should be no less than 100g. If the gastrointestinal tract is well adapted, enteral nutrition should be gradually increased and parenteral nutrition should be reduced. Oral patients' diet should pay attention to the following points:

(1) Light, viscous liquid or semi-liquid containing a little oil.

Fresh vegetables and fruits are rich in vitamins and minerals, especially vitamin C, which has antioxidant effect. The following vegetables and fruits should be selected, such as cabbage, cauliflower, radish, carrot, bitter herb, onion, tomato, bitter gourd, celery, garlic and ginger. And figs, dates, oranges, sour plums and longan. It is advisable to eat more fresh grapes during chemotherapy for gastric cancer to reduce the side effects caused by chemotherapy drugs.

(2) Choose seafood, coarse grains, fungi and milk.

Usually choose sardines, sharks, abalone, sea cucumbers, fish oil and other seafood; Coarse grains such as coarse flour, corn, millet, cereal, buckwheat chips and black rice; Lentinus edodes, mushrooms, tremella, auricularia, milk, yogurt and daily indispensable water play an important role in preventing gastrointestinal tumors.

(3) Maintain a good diet psychology.

To achieve a balanced diet, avoid eating too fast, the food should not be too hot, too hard and too irritating, the diet should be moderate and hungry, and avoid overeating and irregular diet. Keep an optimistic mood and adjust your diet mentality.

(4) Avoid unhealthy food.

Don't eat moldy food and drink alcohol, because they may induce digestive tract tumors and should be kept away as far as possible. Eat less salty, smoked, fried and baked foods and foods containing more nitrate and nitrite, such as salted fish, sauerkraut, sausages and barbecues. Don't drink too much and drink less alcoholic drinks.

(5) Reduce dietary fat appropriately.

Restricting the intake of saturated fatty acids, the fat in the diet will promote the growth of cancer cells, and also make normal cells mutate at an early stage, and then evolve into tumors. High-fat diet is especially closely related to colon cancer and rectal cancer.

(6) The diet should be rich in glutamine.

Glutamine can stimulate the function of B cells and T cells, improve immunity, induce tumor apoptosis, stimulate intestinal epithelium to absorb glutamine, and improve liver function.