The diet of breast cancer patients is similar to that of ordinary people, only that we should pay attention to the changes of the disease and change the diet accordingly. In general, if breast cancer patients have deficiency of qi and blood after surgery or chemotherapy, we will use some food to nourish qi and blood; if some have deficiency of yin after chemotherapy or radiotherapy, we will use some food to nourish yin; if some have heat toxicity, we will add some food to clear heat; or if some have dampness, we will give some food to clear dampness, in short, the premise is that patients can eat, then they are comfortable to eat, and then it is good for treating the disease. In short, the premise is that the patient can eat it, then it is comfortable to eat, and then it is beneficial to the treatment of the disease. Avoidance of food is another aspect that patients are very concerned about. Some say that the recurrence and metastasis of cancer is related to the avoidance of food, while others say that there is no evidence that the recurrence and metastasis of cancer is related to the avoidance of food. Traditional Chinese medicine and modern medical research believe that the development of cancer is related to improper diet, and at the same time, cancer patients need to be treated according to different types of evidence during treatment and recovery, that is, individualized use of different taboos and appropriate diets, and such taboos are not absolute and vary from person to person. Speaking of contraindications, we should know that a healthy diet is an important tool to help patients recover, while an inappropriate diet can be a cancer-causing factor. In China, as early as in the era of Huangdi Neijing (before the Qin and Han dynasties), there is a saying that “the change of the sorghum will lead to a big ding”, which means that eating excessive fatty and thick food and excess nutrition will lead to the occurrence of tumors. Breast cancer, the most common tumor among modern women, has become the first killer of women’s health, and its development is closely related to diet from modern scientific research. It is generally believed that breast cancer is inextricably linked to the influence of endocrine, too much food high in fat and sugar will have a great impact on endocrine such as estrogen, which in turn affects the growth and development of the breast to mutate into tumors, causing obesity and the occurrence of breast cancer. Animal experiments have shown that feeding mice with high-fat food can make the development of breast cancer increase, and if there are other substances stimulating (alcohol, mood changes, etc.), they are more likely to suffer from the disease. The broad sense of taboo means not eating unhealthy foods and changing unhealthy eating habits, but patients are most concerned about the narrow sense of taboo, i.e. what can and cannot I eat myself, such as chicken, seafood, etc. It should be said that so far, there is no evidence to show which food will clearly cause tumor recurrence and metastasis, if this cannot be eaten and that cannot be eaten, then tumor patients almost have nothing to eat, so they will die of hunger. The premise is that patients can eat, then they are comfortable to eat, and then it is good for treating the disease. Never affect the appetite of patients, because once the appetite is reduced, it will affect the recovery of the body.