I’ve heard that it’s not.
A: Some people trash-talk soy because of its potential to be an endocrine disrupter—meaning it can mimic estrogen in the body, which may lead to hormone overload. But while whole soy does contain natural plant estrogens, they’re much weaker than the human hormone—not worrisome, says Dawn Jackson Blatner, R.D.N., a dietitian in Chicago. Moreover, whole-food soy, such as tofu, tempeh, edamame or miso, is a source of complete protein. The possible problem: soy protein isolates, a highly processed form of soy used in cereals, protein bars and snacks among other foods. These may contain more soy isoflavones, high levels of which may be endocrine disrupters, and thus are best limited. And if you have had estrogen receptor–positive breast cancer, your doctor may advise that you’re…
