Asians don't eat A LOT of soy. I lived there and ate in homes and with families. They occasionally eat WHOLE soy beans (endamamme) or have FERMENTED soy such as miso soup or tofu put in a dish with vegetables.
American standard servings of soy is much much greater - just think of all the soy milk, soy lattes, soy shakes, soy burgers with soy cheese and soy chips that we eat... sometimes all in one day. That far exceeds the amounts eaten in Asia on a daily basis.