Due to the gastrointestinal reaction caused by chemotherapy, appetite will be significantly reduced. In terms of dietary regulation, the following aspects should be supplemented: 1, protein supplementation, choose low-fat proteins, such as chicken, duck, fish, loach as well as eel, and also choose some dairy products, as well as plant-based proteins; 2, the problem of fat intake, high-fat and high cholesterol may increase the risk of recurrence of breast cancer, so it is necessary to limit the high-fat and high cholesterol intake, and it is generally required that the intake of fat About 15-25g per day; 3, water supplementation during chemotherapy, drugs are metabolized by liver and kidney, water supplementation is irreplaceable by other nutritional factors, about 3000mL of water per day can promote the excretion of metabolites related to chemotherapy drugs, and protect the liver function and kidney function; 4, carbohydrate supplementation, about 3/5 of the total energy per day; 5, vitamin supplementation , eat more fruits, such as kiwi, pears, apples; 6, dietary fiber, can promote intestinal peristalsis, reduce the occurrence of constipation. It is recommended not to take some health products, try to get supplements from the diet.