For the three meals during chemotherapy, patients are usually allowed to have breakfast a little earlier, about 4 hours before chemotherapy, so that the stomach contents are almost emptied 4 hours after chemotherapy, which can reduce the phenomenon of vomiting. Lunch can also be eaten as little as possible to reduce vomiting. Dinner can be eaten a little later, after the vomiting symptoms have gradually decreased. After chemotherapy, in addition to diet, patients are also advised to take a walk to promote bowel movement and reduce some adverse reactions. The main regulation in diet is protein supplementation, because after the gastrointestinal reaction affects the appetite, it may affect the immune function of the body, and the protein supplementation should be about 1g per kg per day. It is important to limit the intake of high fat, because high fat and high cholesterol will increase the risk of breast cancer recurrence, so the general fat intake is about 15-25g per day.