The female breast is composed of skin, fibrous tissue, mammary glands and fat. Breast cancer is a malignant tumor that occurs in the glandular epithelial tissue of the breast. Breast cancer occurs in 99% of women and only 1% of men. Breast cancer in situ is not fatal because it is not a vital organ that sustains the body’s life activities. However, because breast cancer cells lose the characteristics of normal cells, the cells are loosely connected to each other and easily shed. Once the cancer cells are shed, the free cancer cells can spread throughout the body with blood or lymphatic fluid, forming metastasis and endangering life. Currently, breast cancer has become a common tumor threatening women’s physical and mental health. The global incidence of breast cancer has been on the rise since the late 1970s. One out of eight women in the United States will develop breast cancer in their lifetime. China is not a country with high incidence of breast cancer, but it should not be optimistic. In recent years, the incidence rate of breast cancer in China has been increasing at a rate 1 to 2 percentage points higher than that of countries with high incidence. According to the 2009 breast cancer incidence data released by the National Cancer Center and the Bureau of Disease Prevention and Control of the Ministry of Health in 2012, the incidence of breast cancer in the national tumor registration area ranked 1st among female malignant tumors, and the incidence rate of female breast cancer was 42.55/100,000 nationwide combined, 51.91/100,000 in urban areas and 23.12/100,000 in rural areas. Breast cancer has become a major public health problem in the current society. The global breast cancer mortality rate has shown a decreasing trend since the 1990s; the reasons for this are the screening of breast cancer, which has increased the proportion of early cases, and the development of comprehensive breast cancer treatment, which has improved the efficacy. Breast cancer has become one of the solid tumors with the best curative effect. Breast cancer diet should be avoided 1. It is advisable to eat more foods with anti-breast cancer effect, such as seahorse, horseshoe crab, cobra meat, sperm whale oil, toad meat, crab, red, clam, oyster, tortoiseshell meat, seaweed, asparagus, and stone flowering vegetables. 2.It is advisable to eat more foods with immunity enhancement and relapse prevention, including mulberry, kiwi, asparagus, pumpkin, barley, vegetable beans, yam, shiitake mushroom, shrimp skin, crab, mackerel, prawns and snake. 3, swelling is appropriate to eat barley, loofah, adzuki beans, taro, grapes, lychee, water chestnuts, carp, pond lice, shark, kelp, loach, yellow croaker, snail. 4, swelling and pain, nipple retraction is appropriate to eat fennel, scallions, shrimp, sea dragon, smear oil whale, orange cake, grapefruit, horseshoe crab. Avoid 1, avoid smoking, alcohol, coffee, cocoa. 2, avoid spicy pepper, ginger, cinnamon and other spicy stimulating food. 3, avoid fatty, fried, moldy, pickled food. 4. Avoid hairy food such as rooster. Dietary principles for breast cancer patients: 1. Emphasize balanced nutrition and focus on supporting and replenishing deficiency The internal deficiency of breast cancer patients is the main contradiction in the process of disease occurrence and development. It causes cancer because of deficiency and deficiency because of cancer. The purpose of food therapy is to ensure that breast cancer patients have enough nutrition to improve the body’s ability to resist disease and promote their recovery. Therefore, the Nei Jing says: “Food and meat, fruits and vegetables should be nourished to the fullest, without making too much of them, which will hurt their righteousness.” Under the guidance of the general principle of supporting the righteousness and nourishing the deficiency, the dietary treatment for breast cancer patients should be nutritious, diversified and balanced. As stated in Nei Jing, “Five grains are nourishing, five fruits are helpful, five animals are beneficial, and five dishes are sufficient.” The loss of bias, it is harmful. Breast cancer, like other diseases, has different yin and yang, cold and heat, deficiency and reality. Food is also different from hot, cold, warm and cool, pungent, sweet, bitter, sour and salty. The five tastes of food should be cold and hot, while the cold one should be warm. Pungent taste is warm and dispersed, such as ginger and onion; sweet taste is moderate, such as yam, gorgonian and syrup; light taste is permeable, such as winter melon and coix seed; sour taste is astringent, such as umeboshi and hawthorn; salty taste is soft and firm, such as seaweed, kombu and oyster. 3.Select anti-cancer foods, and strive to be targeted. Some foods have both therapeutic and anti-cancer effects, and can be selected and applied in a targeted manner. Folk use it with clove and persimmon to treat esophageal cancer, breast cancer, liver cancer, etc. Experiments have confirmed its inhibitory effect on transplanted tumors caused by carcinogenic viruses in mice. Foods in daily life, such as garlic, soy products and green tea, are also good anti-cancer agents.