Radiation therapy is one of the means of comprehensive tumor treatment. Patients receiving radiation therapy (referred to as radiotherapy) may develop characteristic syndromes, such as fatigue, weakness, headache, dizziness, oral pain, nausea and vomiting, abdominal pain and diarrhea. Due to the large nutritional consumption and high dose of radiation during the treatment, about 90% of patients have significant reactions, which seriously affect the recovery of patients. Radiation therapy will lead to an increase in catabolism of the body, and the body needs more energy and nutrition; the reaction during radiation therapy will in turn lead to a decrease in food intake, and good nutritional status is the basis of good treatment effect. Therefore, scientific and reasonable diet and nutrition is very important for radiotherapy patients. 1, one week before radiotherapy nutrition preparation stage should eat more lean meat, chicken, duck, eggs, milk, aquatic products (fish), soybean products, rice, noodles, mixed grains, fresh vegetables and fruits and other high protein (increased by 50%), high calorie (increased by 20%, obese people do not increase), high vitamin food, so that the body has a certain amount of nutritional reserves. Specific measures, with reference to the recommended daily dietary intake of normal people formulated by the Chinese Nutrition Society: 200 to 500g of grain, 250ml of milk, 50g of soybeans or their products, 150g of eggs, meat and aquatic products, 400 to 500g of vegetables, 100 to 200g of fruit, 25ml of oil, on top of which the appropriate increase in meat, fish, eggs and milk can be achieved three high. For example, adding one cup of milk, one egg and two taels of fish can increase 30g of protein and 400 kcal (liquid milk and milk powder). In addition to the above-mentioned principles of high protein, high calorie and high vitamin nutrition, we should also increase soups and tea drinks to replenish sufficient water. Food processing is based on steam, boiling, stewing and other easy-to-digest methods. 2.During radiotherapy, different dietary measures should be taken for different radiotherapy reactions during radiotherapy. In case of mucous membrane damage and difficulty in swallowing and chewing, food can be processed into a state of easy chewing and swallowing, such as making minced meat, vegetable puree, porridge, soup, etc. or making a homogenized diet (cook all kinds of foods with balanced nutrition and then break them up with a blender and boil them to taste, which can be sweet or salty), and under the guidance of dietitians or doctors and nurses, suitable enteral nutrition preparations such as Fulvicare, Ansol, and Nengxiang can also be used. The temperature of the diet should be cooler. Smaller and more frequent meals are desirable to increase the volume of diet. In case of radiation dermatitis and mucositis, pay attention to the supplementation of vitamin A, vitamin B2 and vitamin C. More egg yolk, dairy, animal liver, orange-red and green vegetables can be consumed. Radiotherapy patients often have loss of appetite and sluggish sense of taste, diet should be nutritious and clear of fire (such as pear, green beans, silver fungus, etc.). When the sense of taste is reduced, food should be made more fragrant to stimulate the appetite with aroma, and salt and seasoning can be slightly focused to make the mouth feel tasty. People with abnormal sense of smell and nausea and vomiting can add ginger juice to food or drink some Chen Pi tea. Those with constipation should increase the intake of dietary fiber, such as vegetables and fruits, and can eat more kelp, bananas, honey, walnuts, peanuts and other laxative foods. Those with diarrhea should adjust their diet according to the number of diarrhea and the nature of the stool, should reduce the intake of dietary fiber, and can use foods with antidiarrheal effect: charred rice soup, egg yolk rice soup, carrot puree, etc. Pay attention to the nutrient density of the diet, and those with insufficient dietary intake should be given enteral and parenteral nutritional support. The diet is slightly different for different sites of radiotherapy. For example, the diet of esophageal tumor patients should be a fine and soft semi-liquid or homogenous diet, and the temperature of the diet should not be too cold or too hot to reduce the stimulation to the lesion, and warm water can be swallowed before and after eating to reduce the adhesion of food to the lesion. Patients with lung tumor should be especially careful with irritating food. During the period of head and neck radiotherapy, patients should eat more products that nourish Yin and produce fluid, clear heat and lower fire, such as bitter melon, carrot, tomato, lotus root, jellyfish, cabbage, etc.; the main food should be semi-runny juice or soft and rotten food, and pay attention to oral cleaning and care before and after eating. After radiotherapy for chest tumor patients, they should eat more products that nourish Yin and moisten lung, nourish blood, stop cough and resolve phlegm, such as winter melon, loofah, cilantro, spinach, walnut, white fungus, shiitake mushroom, bird’s nest, etc. After abdominal radiotherapy, more products should be given to strengthen the spleen and stomach, nourish blood and replenish qi, such as coix congee, hawthorn, egg, pig liver, chicken liver, fresh fish stew, etc. 3.Dietary treatment for declining blood image On the basis of comprehensive and balanced nutrition, it can be combined with more blood-supplementing foods such as black-bone chicken, spine, ribs, liver, eel, aconite, peanut rice and red dates. The following dietary therapy recipes can be used: ① 10 jujubes, 60g barley kernel, 30g adzuki beans to cook and eat; ② 10 jujubes, 5g longan, 15g wolfberry, add 60g glutinous rice to cook and eat; ③ shiitake steamed meat cake, white fungus steamed lean meat, wolfberry sea cucumber lean meat soup, red dates and peanut rice stewed ribs spine old duck, etc., Lingzhi red dates boiled turtle, red dates and peanut rice soup, goose blood, chicken blood, duck blood, pig blood soup, etc. It should be noted that: food therapy must not replace formal treatment, but only as an appropriate supplement. 4, radiotherapy diet taboos Radiotherapy often leads to “internal heat”, hot food such as dog meat, mutton, and chili, pepper, pepper, mustard, star anise, cinnamon, etc. should not eat or eat less, should not eat salt cured, smoked, burnt, moldy food. It is advisable to eat fresh food, diversify food and pay attention to nutritional balance. More pears, watermelon, mung beans, tofu brain, white fungus, lily, lotus root, duck, turtle, turtle, eel, duck egg and other foods that nourish Yin and clear fire can be used; a small number of meals can be used to increase the intake of nutrients. It is advisable to use dietary supplements such as vitamin preparations, mineral preparations, protein powder, etc. under the guidance of dietitians and doctors and nurses as appropriate. Except for those who are taking traditional Chinese medicine and need to follow medical advice, there should not be too many food taboos to avoid affecting the intake of calories and nutrients. To break the superstition, out of the dietary misconceptions, not only soup not slag, most of the nutrition in the slag, soup nutrition only 5% to 10% of the raw materials; not only eat meat not vegetables, not eggs. You can’t just eat vegetables without eating; you can’t just eat fruits without vegetables; you can’t replace eating with infusion, in addition, the price of food has nothing to do with nutritional value. To focus on the daily diet, do not blindly believe in all kinds of health care products in all shapes and sizes. 5.Diet after radiotherapy After radiotherapy is over, the diet for a period of recuperation at home (3-6 months) can still refer to the above suggestions, and the time of nutritional support after discharge from the hospital is appropriate for the body to return to normal, and it is not appropriate to take in too much nutrition for a long time to avoid causing new health problems