a prominent study of japanese men who ate soy every day found brain degeneration.
as mentioned above, traditionally, soy had always been eaten fermented. miso, nama shoyu soy sauce, tempeh. now tempeh is some good shit!
man, im in thailand travelling right now so ive been eating soy almost everyday to keep my protein intake adequate. soon as i return home im dropping that shit on the fly. but asian countries really do know how to cook a good tofu dish.