here expert and studies explain totally eating soy caouse canser or not. For vegetarians, vegans, and others who follow a plant-based diet, soy is a fantastic source of high-quality protein that is also packed with vitamins, minerals, fiber, and omega-3 fatty acids. How much soy, though, is too much? In addition to all of these nutrients, soy also contains phytoestrogens called isoflavones, which resemble the human hormone estrogen but are different from it and less potent. There is research on the protective properties of phytoestrogens, but some people think that consuming too many of these isoflavones can act as an endocrine disruptor, interfering with how hormones work naturally and possibly increasing the risk of breast cancer. They also think that these isoflavones might even feed the growth of tumors in those with estrogen-related breast cancer. What is the actual relationship between soy and cancer, then? How much soybean is too much, exactly? Does Soy Have a Cancer Risk? The e...