With the development of science and technology, malignant tumors have been transformed from a disease that can only be operated, with rapid progression and poor prognosis, to a chronic disease that can be survived with tumor for a long time with the use of surgery, radiotherapy and biotherapy. In view of this, how to ensure the quality of life of tumor patients is highly valued by the oncology community. The Dietary Guidelines for Patients with Malignant Tumors issued by the National Health and Family Planning Commission provides dietary guidelines for patients with malignant tumors in the antitumor treatment and recovery periods (especially for patients with tumor-bearing tumors), to improve the phenomenon of malnutrition induced or exacerbated in patients at this stage due to decreased intake and weight loss caused by the effects of the tumors themselves and antitumor treatments. Don’t exaggerate the anticancer effect of certain foods one-sidedly Patients with malignant tumors in the treatment and recovery period, maintaining stable weight and keeping ideal weight is beneficial to the prognosis. Patients in this stage, due to the tumor itself and the impact of anti-tumor treatment, often lead to reduced intake and weight loss, inducing or aggravating the occurrence of malnutrition. A suitable and relatively stable body weight should be maintained through rational diet and appropriate exercise. Food choices should be diversified, and one-sided exaggeration of the anticancer effects of certain foods is not recommended to prevent unbalanced nutritional intake. It is recommended to increase the protein content in the diet and consume more high-quality proteins to slow down the protein degradation and reduced protein synthesis caused by tumors. Since tumor cells have a high capacity for glucose uptake and metabolism by glycolysis, it is recommended to limit the intake of sugars, especially refined sugars. Enteral and parenteral nutrition therapy is recommended to meet the nutritional needs of patients with malignant tumors when the target intake cannot be met after dietary guidance during the treatment and recovery period. Rough grains, fruits and vegetables play a role in preventing tumors 1, it is best to eat more than 50g of rough grains, cereals, including rice, noodles, mixed grains, potatoes, including potatoes, sweet potatoes, cassava, etc. per day. They mainly provide carbohydrates, protein, dietary fiber and B vitamins. To maintain an appropriate amount of cereals in daily diet, 200g~400g should be consumed every day, and the processing of cereals is too fine, which can lead to the loss of most of the vitamins, minerals and other nutrients and dietary fibers contained in the surface layer, and the combination of coarse and fine is conducive to the reasonable intake of nutrients, so it is recommended that more than 50g of coarse grains be consumed every day. In the early postoperative period of colorectal cancer, in order to reduce the amount of stool, to reduce the intake of coarse grains. In addition, tumor will cause insulin resistance, as well as radiotherapy treatment on the body of the damage can lead to a considerable portion of tumor patients with diabetes or impaired glucose tolerance, coarse grains than finely processed carbohydrate foods with lower glycemic index, more conducive to the control of blood glucose. 2, you can use beans and soy products instead of meat. They are an important source of high-quality protein, dietary fiber, vitamins, minerals and phytonutrients (plant sterols) and do not contain cholesterol. Beans and cereals are consumed together, which can increase protein utilization through protein complementation. There are many types of soy products on the market today, which can be broadly categorized into traditional soy products, soy milk-based soy products and new soy protein-based soy products. At the same time, soy products are rich in essential fatty acids and phospholipids, and do not contain cholesterol, which is a good alternative to meat food. Soy saponins, soy isoflavones and soy peptides, which are mainly found in legumes, may have a positive effect on the prevention and treatment of cancer. 3. Eat at least 400 grams of vegetables and fruits every day. In order to prevent cancer and chronic diseases, the World Health Organization proposes to eat at least five servings (at least 400 grams) of different kinds of non-starchy vegetables and fruits every day. The review released by the World Cancer Research Fund suggests that increased intake of vegetables and fruits may have a protective effect against tumors of the whoosh system and digestive system. 4, a variety of vegetable oils to switch. A rich variety of fat sources, including n-6 polyunsaturated fatty acids, n-3 polyunsaturated fatty acids, monounsaturated fatty acids, etc., are conducive to maintaining the balance of inflammation and reducing lipid peroxidation in patients with tumors, so it is recommended that a variety of vegetable oils be consumed alternately. Stay away from red meat, alcohol and pickled food 1, should reduce the intake of red meat: a study found that a large number of people who consume red meat in the intestinal tract N-nitroso compounds increased levels, can increase the risk of colon cancer and other tumors. In addition, the content of carcinogenic substances such as nitrite or benzo(a)pyrene contained in meat food after curing or smoking is significantly higher and should be avoided as much as possible. For patients during radiotherapy, when accompanied by gastrointestinal damage, it is recommended to prepare soft and finely chopped animal food to reduce the burden on the gastrointestinal tract and promote absorption. According to “Dietary Guidelines for Chinese Residents 2007”, the recommended daily intake: 50g~100g of fish and shrimp, 50g~75g of livestock and poultry, 25g~50g of eggs. 2. Avoiding alcohol intake: There is no evidence to show that drinking less than how much alcohol does not increase the risk of cancer caused by it. That is to say, even small amounts of alcohol should be avoided if the evidence is based solely on cancer. Similarly, the evidence suggests that all alcoholic beverages have the same effect. There is no information to suggest that there are significant differences between drink types. Therefore, be it beer, wine, spirits (liquor), or other alcoholic beverages, they should all be avoided. 3. Limit foods that are salted or overly salted: Avoid foods preserved with salt. Eat less grilled (fire-roasted, charcoal-roasted) and smoked animal foods. Barbecuing or cooking meat on an open fire will form heterocyclic amines and polycyclic aromatic hydrocarbons with carcinogenic effects, which are one of the causes of stomach cancer.