The dietary principles of tumor prevention and treatment are: eat less meat, drink more soup, should be in all seasons, and proper supplementation. Eating less meat, including oil. Due to history and diet, we inherited the gene of less meat from our ancestors and got used to the inner environment of less meat and more millet and vegetables. More meat will change the balance of the inner environment and cause disorder; meat is more acidic and acidic body is prone to tumor; too much meat and fat intake will easily cause toxin accumulation in the body; therefore, more meat will lead to disorder of the inner environment and toxin accumulation until tumor arises. Drinking more soup means drinking more water, vegetable soup and so on. Drinking more soup will help to eliminate toxins in the body and reduce the internal factors that cause tumors. The food of the four seasons should be consumed, and the food of the four seasons should have the properties of the four seasons and nourish the people of the four seasons. In other words, one side of the water and soil nourishes one side of the people. Appropriate supplementation, refers to the supplementation is not just supplementation, to be deficient then tonic, real then drainage, stagnant then evacuation, stasis then transformation, cold then heat, heat then cold, etc.; essence is sufficient, qi blood, qi smooth, that is, supplementation. Specific dietary recommendations: low-fat, low-salt, moderate amount of high-quality protein, high vitamin, high fiber diet, take the method of dialectical meal preparation, dialectical food administration. Diversified meals based on plant foods, more fresh vegetables and fruits. For meat foods, the intake of customary red meat (referring to cattle, lamb, pork and their products) should not exceed 100g per day; it is better to consume white meat, choose fish and poultry, and meat from non-domestic animals is better. Do not eat burnt meat and fish, as well as eat less sizzling, smoked and smoked meat and fish. Do not consume foods contaminated with mycotoxins or stored at room temperature for long periods of time. Limit salt intake to no more than 6g per day for adults from all sources, which includes a variety of foods cured in salt. The dietary therapy for tumor prevention and treatment should follow the following basic principles: 1. emphasize balanced nutrition and focus on supporting and supplementing deficiency: “internal deficiency” of tumor patients is the main cause of disease occurrence and development. Because of deficiency, cancer-causing toxins in the body are flooded and tumors appear; cancer toxins consume positive energy and aggravate body deficiency; deficiency is mixed with reality and deficiency is the basis. Therefore, proper supplementation for tumor patients can improve the body’s ability to resist diseases and promote the recovery of patients. In the Yellow Emperor’s Classic of Internal Medicine, it is said that “the grains, meat, fruits and vegetables should be eaten to the fullest, without making too much of them, which will hurt their righteousness”. It is also said that “five grains are nourishing, five fruits are helpful, five animals are beneficial, and five vegetables are filling”. If you lose the bias, it will be harmful and unhelpful. Under the guidance of supporting the righteousness and supplementing the deficiency, the food therapy for tumor patients should be nutritious, diversified and balanced. 2.Familiar with the nature and taste of food and emphasize the differentiation of food: normal people and tumor diseases have different properties of yin and yang, cold and heat, deficiency and reality. Food also has cold, hot, warm and cool, pungent, sweet, bitter, sour and salty tastes. The hot body should eat cold, cold body should use warm. Each of the five flavors has its own place in the mouth and feeds the five organs. Sweet taste into the spleen, such as yam, gravy, caramel, etc.; pungent taste into the lungs, such as ginger, onion, etc.; bitter into the heart, such as bitter melon, cucumber, etc.; acid into the liver, such as plum, hawthorn, etc.; salty taste into the kidney, such as seaweed, kombu, oysters, etc.. Food therapy also need to identify the evidence of consumption, depending on the disease, different from person to person, not uniform. If the evidence is identified as toxic heat congestion, the evidence of internal incandescence of evil fire, the patient’s symptoms of heat (such as bitter mouth, dry mouth, etc.), you can not invest in warm food supplements, such as cinnamon, litchi, venison, ginseng, mutton, dog meat, prawns, etc.; but should be given to have the effect of detoxification of heat vegetables, food, such as fishy grass, horsetail, capers, duck meat, reed root, asparagus, etc.. For weak spleen and stomach with symptoms such as less food, bloating and loose stools, foods that strengthen the spleen and stomach, such as yam, poria, lotus seeds, hen’s nest, malt, etc., are appropriate. During radiotherapy and chemotherapy, cancer patients may suffer from dry mouth and throat, dullness and constipation due to heat toxicity, so they should eat more sweet and cold foods that nourish yin and produce fluid, such as water chestnut juice, water chestnut juice and pear juice. Patients with lung cancer who have cough, coughing phlegm, blood in phlegm, etc., should avoid spicy, fishy and fetid foods that rob yin and produce phlegm, as well as congestion foods, such as onion, garlic, dog meat, eel, etc. In case of abdominal distension and ascites complicated by various malignant tumors in the liver, stomach and abdominal cavity, it is advisable to eat more light permeable diuretic foods and avoid congestion foods, such as barley, adzuki beans and pumpkin. In short, we should pay attention to the identification of food, reasonable food therapy. 3, eat seasonal food, nourish the human body four seasons: people and spring, summer, autumn, winter seasons corresponding to the four seasons, the four seasons of the fruits and vegetables, its hot and cold properties, catering to the four seasons, the full nourishment of the five organs of Qi, draining the six bowels of turbidity. Not only tonic, but also sparse regulation, the body health, disease recovery. Such as the north, spring spinach, green onion, dandelion, etc., summer watermelon, mint, etc., autumn apples, pears, etc., winter cabbage, potatoes, sweet potatoes, etc.. Different regions, to adapt to the local hot and cold climate, eat more local seasonal food, the sky is in harmony, no worry and no disease. 4, medicine and food is the same source, the treatment should be focused: Chinese medicine believes that medicine and food are the same source, many drugs in Chinese medicine, are common food, such as lily, mint, burdock, asparagus and so on. Happily, some foods have both therapeutic and anti-cancer effects, and can be selected for use in a targeted manner. For example, daily life foods such as burdock, asparagus, barley, houttuynia cordata (fishy grass), garlic, silver fungus, fungus, soybean products, green tea, figs, almonds, water chestnuts, umeboshi, lily of the valley, yellow essence, mussels, snails, tits, bird’s nest, sea cucumber, etc., are also anti-cancer drugs. Different foods have certain specificity for different tumors, such as foods often used for digestive tumors, such as leek, Ulva, cabbage, asparagus, knife beans, etc.; foods commonly used for lung cancer, intestinal cancer, cervical cancer, chorioallantoic epithelial cancer, such as lily, barley, etc.; foods commonly used for thyroid and neck tumors, such as kombu, seaweed, nori, etc.