Should oncology patients be on nutritional support? Malnutrition exists in 31-87% of our malignant tumor patients, and 20% of malignant tumor patients die directly due to malnutrition rather than the disease itself. Current studies at home and abroad show that: 1. Nutritional support, as a whole, improves the immunity of the body, which is beneficial to inhibit the growth of tumor. 2.After nutritional support, even if the growth of tumor is active for it, the tumor enters into active growth phase (division phase) from quiescent phase, which is more favorable to chemotherapy. 3. Nutritional support before and after surgery is beneficial to reduce the occurrence of complications, decrease the mortality rate of surgery and speed up the recovery; nutritional support during radiotherapy and chemotherapy also enables the treatment to be completed. These benefits eventually translate into improved patient life treatment and prolonged patient survival, which is also the goal of current tumor treatment. Meanwhile, current research shows that actively growing tumor cells are more sensitive to radiotherapy and chemotherapy. Therefore, moderate nutrition is the first priority of anti-tumor treatment. How to give nutritional support treatment to patients Research has found that the metabolic characteristics of tumor among tumor patients: tumor mainly relies on sugar metabolism, while human body mainly relies on fat metabolism. Therefore, reducing the intake of glucose and increasing the intake of fat is the basic strategy of tumor nutrition. Before doing nutritional therapy, the nutritional status of patients is evaluated, and enteral or parenteral nutrition is selected according to the need. Parenteral nutrition mainly relies on infusion, while enteral nutrition mainly refers to the method of delivering nutrients into the patient’s body by oral or tube feeding (nasogastric tube, nasoenteric tube, gastrostomy, jejunostomy, etc.) through the gastrointestinal tract. Enteral nutrition is used as much as possible when gastrointestinal function allows. The principles of nutrition therapy include: four requirements: fluid, calories, protein, micronutrients; three ratios: sugar/fat energy supply ratio, calories/nitrogen ratio, sugar/insulin; two choices: fatty acids, amino acids; and one principle: individualization. Based on the scientific quantification of the patient’s nutritional status in order to develop an individualized nutritional program. What do patients with radiotherapy eat? Many people think that the body is weak during chemotherapy, so is it better to take more and more supplements at this time? In fact, it is not, the big supplement food, not only can not digest and absorb, but also aggravate the gastrointestinal digestion and absorption dysfunction, further aggravate the anorexia. Reasonable dietary nutrition for chemotherapy patients should be carried out in response to the toxic side effects of chemotherapy, which are mainly manifested in systemic reactions, gastrointestinal reactions, bone marrow suppression and other aspects. The diet of chemotherapy patients should be light, nutritious and easy to digest, with semi-liquid or soft food with less residue, avoiding greasy and indigestible food, and patients with poor appetite can eat less and more meals. Patients with poor appetite can have fewer meals. Moreover, rich nutritious food should be provided to improve the tolerance of the body to the toxic side effects of anti-cancer drugs. Specifically, it is divided into the following aspects: 1. During chemotherapy, patients’ diet should be mainly high-calorie and high-protein, such as chicken, duck, fish, shrimp, lean meat, eggs, etc., so as to play a supplementary therapeutic role. 2, food is mainly steamed, boiled, and avoid eating animal food that has been placed too long. 3, diet should be diversified, pay attention to dietary mix, with a view to a variety of nutrients complement each other to improve the body’s immunity. 4, eat more natural green vegetables, fruits, such as carrots, pumpkin, apricots, wheat kernel, green vegetables, tomatoes, etc.. 5.Mushrooms, mushrooms, monkey head mushrooms, fungus and other foods have been found to be rich in polysaccharides, which are very effective in improving the immune function of human cells and can inhibit or destroy cancer cells.