It is best to eat foods rich in high quality protein as well as fresh vegetables and fruits before chemotherapy. Patients can choose foods rich in high-quality protein before chemotherapy, such as fish, lean meat, milk, eggs, etc., and can appropriately add some fungal foods, such as shiitake mushrooms, mushrooms, etc., as well as soybean products, such as soymilk and tofu. Supplement the protein needed by the body and improve the immunity of the body. In addition, tumor patients should also eat more fresh vegetables and fruits, such as celery, cauliflower, apples, bananas, kiwi and so on, to replenish vitamins and ensure smooth bowel movements. Tumor patients usually try to eat a diversified diet to ensure adequate nutrition. Avoid smoking and alcohol, and avoid eating spicy stimulating foods, such as chili peppers and fried foods.