Good nutritional support contributes to the smooth treatment and recovery. Lung cancer patients with adequate dietary nutrition supplementation, balanced diet and reasonable combination will be more tolerant to chemotherapy, radiotherapy and surgery treatment, and also improve immune function and survival quality and prolong life. Then, how exactly should lung cancer patients scientifically and reasonably regulate their diet and nutrition? The most important thing is to pay attention to the stage. I. More protein in early stage Lung cancer early stage shows symptoms such as cough, shortness of breath and blood in sputum. During this period, the digestive system is relatively sound and there is no need to avoid eating, so the body should be supplemented with comprehensive nutrition to enhance resistance. You can eat more meat, fish, eggs, milk, beans, rice and noodles, fresh vegetables and fruits to replenish rich protein, sufficient heat and vitamins. Consume 200 to 500 grams of cereals, 250 ml of dairy, 125 to 250 grams of meat, fish and eggs, 50 grams of soybeans and products, 400 to 500 grams of vegetables, and 100 to 200 grams of fruits daily. Special attention should be paid to the day before surgery, do not eat too much too full, should be based on a light diet, if too much food will accumulate in the gastrointestinal tract, before the operation excretion is not out, to the post-surgery gastrointestinal function recovery brought adverse effects. Lung cancer is a thoracic surgery, which has little impact on the gastrointestinal tract, so there is no need to restrict the diet too much after surgery to avoid malnutrition, which will affect the recovery. One week after surgery is the recuperation period for surgical trauma, and diet and nutrition are especially important at this time. About 6 hours after removal of tracheal intubation, you can start to drink a small amount of warm water (one or two sips). If there is no nausea, vomiting, choking and coughing, then you can start a small amount of liquid diet (about 50 ml) at an interval of 2-3 hours, and then gradually increase each time until about 300-500 ml, 5-6 times a day. On the third postoperative day, a semi-liquid diet of about 500 ml each time, 5 to 6 times a day, can be introduced. Generally, you can resume normal diet after 4 to 5 days. At this time, you should eat more light, nutritious and easily digestible foods, such as shrimp and fish, in order to facilitate wound healing and physical recovery. It is also important to consume plant-based proteins, such as bean products. Also eat more fresh fruits to replenish various vitamins and loosen the bowels. Particular attention should be paid to getting out of bed after eating to promote gastrointestinal motility and maintain normal digestive function. Do not eat too much gas-producing food, such as milk and eggs, which can easily cause abdominal distension. In hot weather, attention should be paid to salt and water supplementation to prevent electrolyte disorders and dehydration. III. Eat more between radiotherapy and chemotherapy After radiotherapy, lung cancer patients often have dry mouth, poor appetite, nausea and vomiting and other gastrointestinal reactions in the digestive tract, which cause emotional tension, pain and apprehension. First of all, we should eliminate bad psychological factors, especially don’t be nervous before meals, keep emotionally stable, create a good eating environment, and try to eliminate pus and phlegm blood from the potty, spittoon and drug change to avoid malignant stimulation. Family members encourage the patient to eat more, mainly foods that clear heat and lower fire, sweet and cool and produce fluid, such as watermelon, mung beans, silver fungus, radish, etc. Never eat spicy, fragrant and dry or fried foods, such as onion, garlic, chili, leek, etc. Do not eat high-calorie, high-protein and greasy food, but eat more high-vitamin, easy-to-digest food, such as fresh vegetables and fruits, rice and noodles, yogurt, etc. You can also eat a small amount of chicken soup. Avoid wind and cold, pay attention to rest, prevent fatigue, and keep a happy spirit. Diversification of late stage menu Late stage lung cancer patients will have symptoms such as fever, emaciation and weakness, etc. The main psychological reaction in this period is anxiety and depression, which will lead to different degrees of loss of appetite, so first of all, you should regulate your emotions and build up confidence to overcome the disease. The diet should be diversified, not partial, and avoid always eating one kind of food. When cooking dishes, you can make more efforts in color and flavor according to your taste. If you feel nauseous when eating, you can chew a few slices of ginger before the meal. At the same time, to keep the bowels open, eat more coarse fiber food, such as asparagus, celery, bananas. The most important point is not to be too hungry or too full, and not to eat sticky and heavy food, so as not to cause loss of appetite. Specially remind lung cancer patients to pay attention to “four taboos” in diet. 1. avoid eating spicy and stimulating foods, such as chili, ginger, pepper, raw onion, raw garlic, etc.; 2. avoid smoking and drinking alcohol. Avoid eating fatty and phlegmatic foods, such as fatty meat, fatty duck, cream, cheese and various sweet foods with high sugar content; avoid eating barbecued foods, any food barbecued with charcoal, coal or gas contains carcinogenic substance benzopyrene, which will worsen the tumor.