1.Ensure sufficient nutrition. Lung cancer patients should ensure sufficient nutrition, protein, fat, sugar, vitamins, inorganic salts, etc. It is also appropriate to use foods that enhance the immune function of the body and help drugs inhibit the growth of tumor cells. Such as: almond, coix seed, rhizome, oyster, lily, white fungus, lotus root, lotus seed, snow pear, radish, white fruit, loofah, mustard, buckwheat, fig, etc. As radiotherapy can lead to nausea, vomiting and other gastrointestinal discomfort, the reduction of food will lead to the deterioration of the patient’s nutritional status, which is unfavorable to the treatment effect of the disease. Therefore, during radiotherapy, lung cancer patients should take a variety of food such as protein, fat, sugar, etc., and mix a variety of food, such as lean meat, eggs and other animal food with tofu, soy milk and other plant food, which can complement each other and improve their nutritional value. Food types should be mainly cancer prevention foods, such as cauliflower, onion, capers, etc. Eat more fiber-rich foods, less refined rice and flour, more coarse grains and grains and cereals, and keep the bowel movement smooth, which can ensure the supply of various vitamins and trace elements, thus preventing the occurrence and progress of cancer. 2. Eat more fresh vegetables and fruits. Fresh vegetables and fruits are rich in vitamins such as vitamin A, carotene, vitamin C and vitamin E. These vitamins have antioxidant effects, which can block the synthesis of carcinogenic nitrosamines and inhibit the occurrence of cell malignancy, and also enhance the immune function of the body. Recent studies have shown that vitamin C has anti-cancer and anti-cancer effects. Fresh vegetables and fruits should not be eaten raw as much as possible, and the cooking time should not be too long to avoid the loss of vitamins and other nutrients caused by placement. 3. Pay attention to the cooking method. Cooking method, heating temperature and cooking time are very important to the diet of lung cancer patients. Generally speaking, the cooking methods of different foods are different, such as cereals and nuts need to be stewed for a long time, while meat and bones can be stewed for a long time to play a nourishing role; fresh vegetables need to be cooked for a short time to reduce the loss of vitamins and other nutrients. Some vegetables rich in vitamins and other nutrients can be eaten raw, can be used cold and other methods to help protect the nutrients of food. 4, light diet benefits. Due to their living habits, some patients like to eat spicy, fried and other stimulating foods, such as wine, strong tea, coffee, chili, carbonated drinks, etc. These foods will mostly cause damage to the mucous membrane of the digestive tract or contain carcinogenic substances, so they should not be eaten more. Long-term consumption of alcohol, especially strong alcohol, will easily affect the liver function and its metabolism, thus affecting the normal cycle of human body functions, which is not conducive to the treatment and recovery of lung cancer patients. 5.Timely and quantitative meals. The diet of lung cancer patients should be regular, quantitative, less food and more meals. It is necessary to set meal time and food content, to take in enough nutrition according to the calorie intake, to avoid overeating and inordinate diet, and not to reduce or increase the quantity of food intake arbitrarily because of personal preference.