Recently, a message went viral on the Internet and was screened by my circle of friends. Some friends forwarded it to me to ask if it was correct. The news is roughly like this: “A woman who drank home-milled soy milk every morning for three years found out breast cancer.” This kind of news, for medical professionals, is a rumor, but from the reaction of non-medical friends in the circle of friends, many people believe it to be true, and are worried about what to do if they drank soy milk before, seeing that the rumor is very popular for a while, it is necessary to make some clarifications on this matter: [The truth: eating soy products has nothing to do with breast cancer] In 2014, the Chinese Anti-Cancer Association listed public One of the misconceptions is that soy products contain soy isoflavones (estrogen) and cannot be eaten by breast or ovarian cancer patients. First of all, natural soy foods such as tofu and soy milk do contain estrogen, but the estrogen they contain is the phytoestrogen soy isoflavone, and its content is not high, and its effect is only 1/1000 to 1/100 of the estrogen in women’s bodies, which is not enough to change the overall level of estrogen in the body and has no significant effect on patients with breast cancer, ovarian cancer and other hormone-related tumors. It has no significant effect on patients with hormone-related tumors such as breast cancer and ovarian cancer. More importantly, some studies have found that phytoestrogens are different from estrogens in the human body. Phytoestrogens play a two-way regulatory role on estrogen levels in women: when estrogen levels in the human body are low, soy isoflavones exhibit the effect of raising estrogen levels in the body; while when estrogen levels in the body are high, soy isoflavones exhibit the effect of lowering estrogen levels in the body. Many studies have shown that the consumption of soy milk, tofu and other soy products not only does not induce breast cancer, but on the contrary, reduces its risk. Therefore, as long as the patient’s kidneys are functioning normally, drinking soy milk in moderation not only has no harmful effects, but indeed has benefits. For women with high estrogen levels, it is also possible to consume such foods appropriately. The woman who drank it for 3 years is not overdoing it, and the detection of breast cancer is not directly related to drinking soy milk. Another reason: high fat diet is related to breast cancer] Cancer is a lifestyle disease that is caused by a combination of factors over a long period of time, never by a single factor. Dietary factors are only one of them. There is an idiom in China that “disease enters through the mouth”, which is true for many diseases, including the occurrence of certain cancers. According to the survey, the dietary structure of some residents in big cities has exceeded 30% of total calories in fat, thus the incidence of colorectal cancer, breast cancer, prostate cancer, endometrial cancer and ovarian cancer among residents in big cities has increased rapidly in the past decade. Among them, the incidence of breast cancer has ranked the top among malignant tumors among urban women. Why eating too much fat can promote the occurrence of certain cancers? One of the reasons is that the occurrence of breast cancer is related to the imbalance of female endocrine and estrogen disorder. The growth and development of breast gland and the secretion of breast milk are regulated and influenced by estrogen and progesterone, especially estrone and estradiol, which are directly related to the development of breast cancer. When people eat too much fat, it can promote the formation of more estrogen in the body and strengthen the stimulation of estrogen to the breast, which will stimulate breast hyperplasia or cancer and increase the risk of breast cancer.