The occurrence of breast cancer is related to many factors such as diet, genes, environment, and stress. For individuals, genes are established and the environment is relatively certain, the role of dietary factors in the prevention and improvement of breast cancer is particularly important Stay away from obesity Obesity increases the risk of breast cancer and is also a poor prognostic factor for breast cancer. A low-fat, low-calorie diet can have a positive impact on the prevention and treatment of breast cancer. Vitamin D Vitamin D can reduce the risk of breast cancer and can inhibit the growth of tumor cells, which has a positive effect on breast cancer recovery. Foods rich in vitamin D mainly include sea fish, animal liver, egg yolk, lean meat and skim milk. EPA, DHA Both EPA and DHA are members of the omega-3 polyunsaturated fatty acid family. The content of fatty acids in breast adipose tissue is closely related to the occurrence of breast cancer, and the intake of dietary fat affects the formation of fatty acids in adipose tissue. The current dietary habits of Chinese residents are dominated by the intake of ω-6 polyunsaturated fatty acids, and experiments have shown that the growth of breast cancer cells can be inhibited when the ratio of ω-3 and ω-6 polyunsaturated fatty acids is 1:1. Therefore, for breast cancer patients and breast cancer susceptible people, they should increase the intake of ω-3 polyunsaturated fatty acids and eat more ω-3 rich foods such as deep sea fish. Reduce red meat intake Excessive intake of red meat, such as pork, beef and sheep, may lead to excessive dietary calorie and fat intake and increase the risk of breast cancer. Drink alcohol in moderation Excessive alcohol consumption increases the risk of breast cancer and is detrimental to the prognosis of breast cancer. The stimulation of alcohol can promote the production of vascular tumors in the breast and affect the body’s immune system, leading to abnormal secretion of estrogen and other hormones. Moreover, the metabolites of alcohol in the body can also promote the growth of breast cancer cells. Therefore, the amount of alcohol consumption should be controlled in daily life.