In the process of killing tumor cells, chemotherapy will also bring some side effects, such as decreased immunity, nausea, vomiting, loss of appetite, lowered white blood cells, etc., which will affect the normal course of chemotherapy, therefore, during the chemotherapy period, attention should be paid to dietary regimen to restore physical fitness and enhance immunity, so as to successfully complete chemotherapy. Breast cancer patients are generally weak, so they should increase their protein intake during chemotherapy and eat less high-fat and high-cholesterol food, but more lean pork, beef, chicken or fish. The diet should be diversified, with meat and vegetables, acid-base balance, and pay attention to the color, aroma and taste of food. Patients with anorexia can eat some appetizing foods such as hawthorn, radish and kumquat to increase their appetite. 2. Eat more foods rich in anti-cancer ingredients: The following types of foods have certain preventive and curative effects on breast cancer patients: ① cabbage, cabbage, kale, etc. contain indole-3-methanol, an anti-cancer substance, which can prevent the induction of tumor cells by carcinogens in the body and inhibit the growth of tumor; ② garlic, onion, etc. contain allicin, which can block the synthesis of nitrosamines. (2) garlic and onion contain allicin, which can block the synthesis of nitrosamines, and vitamin C and vitamin A, which can play an anti-cancer role; (3) bean products such as tofu, soy milk and soy sprouts are rich in phytoestrogens, which can competitively inhibit the effect of estrogen in the body and play an anti-cancer role; (4) asparagus contains histone, which has been proved to be effective in controlling the growth of breast cancer cells. In addition, seaweed, nori and tomatoes are rich in anti-cancer ingredients, which can be beneficial to breast cancer patients. Fresh fruits such as apple, kiwi, apricot, pear and strawberry are rich in vitamin C and vitamin B, which have certain anti-cancer effects. Dates not only contain many anti-cancer ingredients such as hawthorn acid, but also have therapeutic effects on the reduction of white blood cells and platelets caused by chemotherapy, so breast cancer patients can often consume dates during chemotherapy. 4. Reasonable arrangement of diet and chemotherapy: Chemotherapy can often cause nausea, vomiting and other gastrointestinal reactions, so it is necessary to arrange the diet reasonably during chemotherapy. On the day of chemotherapy, diet should be light and tasty; through intravenous chemotherapy when fasting, so you should eat 3 hours before chemotherapy, when the food has been basically digested and emptied, after the end of chemotherapy dinner later, to reduce the symptoms of nausea, vomiting. When taking chemotherapy drugs orally, it is better to take them half an hour after meals, when the blood concentration reaches its peak, when there is already a fasting state, the digestive tract reaction will be lighter. Chemotherapy vomiting can be ginger slices in the mouth, for the anti-vomiting will help. 5, after chemotherapy, the body is weak, it is appropriate to choose easy to digest, nutritionally balanced food: such as: steamed buns, buns, dumplings, thin porridge, fish, eggs, soup, bananas, jam, etc.. Eat less and more meals.