During the treatment period, the immunity of cancer patients will be reduced. It is recommended that patients should have regular diet and rest time, eat more high protein, fruits and vegetables, avoid greasy and spicy food, communicate more with patients to ensure their stable emotion and do the review work. 1.What foods are suitable for lung cancer: (1) It is appropriate to eat more foods with immune enhancing and anti-lung cancer effects, such as barley, sweet almond, rhizome, oyster, jellyfish, yellow fish, sea turtle, crab, horseshoe crab, ark, sea cucumber, poria, yam, jujube, oyster snake, string bean, mushroom, walnut, turtle. (2) It is advisable to eat white fruit, radish, mustard, almond, orange peel, loquat, olive, orange cake, jellyfish, water chestnut, kelp, purple cabbage, winter melon, loofah, sesame, figs, pine nuts, walnuts, tamari, luo han guo, peach, orange and pomelo. (3) Cucumber, winter melon, bitter melon, lettuce, eggplant, hairy greens, lily of the valley, amaranth, water chestnut, water spinach, stone flowering cabbage, horsetail, plum, watermelon, pineapple, pear, persimmon, orange, lemon, olive, mulberry seeds, water chestnut, duck, mackerel. (4) Eating plum, lotus root, sugar cane, pear, cotton, jellyfish, sea cucumber, lotus seed, diamond, kelp, mustard wheat, black bean, tofu, capers, eggplant, milk, carp, turtle, grass carp, squid, yellowtail, snapper, oyster, and tamari is recommended. (5) Foods to reduce the side effects of radiotherapy and chemotherapy are recommended: goose blood, mushrooms, shark, cinnamon, eel, walnut, snapper, turtle, kiwi, Ulva, goldenseal, jujube, sunflower seeds, apple, carp, green bean, soybean, red bean, shrimp, crab, silver bean, loach, pond lice, grass carp, mahi-mahi, green tea, field snail. (6) Eat fruits, vegetables and coarse cereals daily. 2.What are the best foods not to eat for lung cancer: (1) Quit smoking, which is the most effective way to prevent lung cancer. (2) Drink less strong alcohol. (3) Don’t eat moldy and spoiled food, and eat less pickled food. (4) When eating, chew slowly and do not eat food that is too hot. (5) Avoid spicy stimulating food: onion, garlic, leek, ginger, pepper, chili, cinnamon, etc. (6) Avoid frying, barbecue and other hot food. (7) Avoid greasy, sticky and phlegm-producing foods. (8) Do not consume too much fat, the intake is controlled at less than 30% of the total calorie intake, i.e. 50g~80g of animal and vegetable fat per day; eat more fresh vegetables and fruits, supply 10g of fiber and general level of vitamins per day. (9) Eat less smoked food.