For tumor patients, scientific and reasonable diet is very important for treatment and recovery. The following is an introduction to the usual diets and precautions for cancer patients: 1. Ordinary Diet For: (1) Cancer patients during the postoperative recovery period. (2) Patients before and after chemotherapy and radiotherapy. (3) Cancer patients without digestive system dysfunction. (4) Patients not accompanied by clinical acute phase symptoms such as fever and bleeding. Normal diet for cancer patients should be nutritious and easy to digest food, which contains more animal protein and vitamins and less fried food. Attention should be paid to the way of cooking and reasonable combination of food, so that the food is fancy, nutritious and easy to digest, and attention should be paid to the patient’s taste and reaction. For patients before and after clinical treatment, a good general diet is one of the important measures to improve the nutritional status of the patient’s body, enhance the therapeutic effect and promote recovery. (1) Cancer patients with weak digestive function after radiotherapy and chemotherapy. (2) Patients with gastrointestinal tumors healed after operation. (3) Patients with mouth ulcer or oropharynx with inflammation and edema. The staple food of soft diet should be steamed bread, bread, buns, dumplings and other pasta, fish, shrimp, liver puree and so on can be eaten, vegetables should be chopped and boiled, and strong seasonings such as chili and mustard should not be eaten. Semi-fluid food is suitable for: (1) Patients in the recovery period after tumor surgery. (2) Patients with serious digestive dysfunction. (3) Patients with difficulty in swallowing caused by oral cavity and pharyngeal tumor. (4) Patients with high fever. Generally, liquid food is the main food, which contains very little food residue and is easier to digest than soft food. In order to meet the nutrient and calorie needs of cancer patients, they should eat small, frequent meals (every 2-3 hours, 6-8 times a day). Only a small amount of meat products should be used, and they should be chopped and cooked for drinking. 4.Fluid food Applicable to: (1) Cancer patients with digestive tract obstruction in middle or advanced stage tumors. (2) Cancer patients with difficulty in swallowing. (3) Initial food intake after operation of various thoracic and abdominal tumors. (4) Advanced cancer patients with extreme physical exhaustion. The food is mostly in liquid form, without food residue, and is extremely easy to digest. Fluid food should be eaten in small portions every day, but it still cannot meet the daily needs of nutrients and calories, so it is easy to use only for a short period of time. Cancer patients should pay attention to the choice of food during the disease, which is equally important for the treatment and recovery of tumor patients. For example, no smoking and alcohol; no pickled and moldy food, such as pickles, moldy peanuts, salted fish, etc.; avoid smoked, fire-roasted and deep-fried food, especially the baked and charred food; no bony, rough and hard, sticky and indigestible and crude fiber-containing food; avoid heavy taste, too acidic, too sweet, too salty, too cold, too hot, and too much gas-containing food. Diet is considered by modern scientists to be one of the most powerful weapons against cancer, and information published by the U.S. National Cancer Institute shows that a proper diet can effectively stop or prevent cancer. The right diet can activate the body’s detoxification mechanisms, can prevent genetic mutations in cells, and can turn off the destructive switches of cancer-causing pathogens. Antioxidants in food, such as vitamins, can remove carcinogens and even repair the cellular damage they cause; the right diet can also make the proliferative benign tumors, which already have a certain degree of danger, transform in a normal direction. Cancer Research Center of the United States that have anti-cancer effect of some of the food: 1, cruciferous foods (kale, greens, cauliflower, cabbage, cabbage, white radish, etc.); 2, garlic, soybeans, green onions, ginger, garlic; 3, melon, carrots, celery, tomatoes, eggplants, potatoes; 4, citrus fruits (such as oranges, orange, pandan, grapefruit, lemons, etc.); 5, whole grains, oatmeal, brown rice and so on.