Making processed soy a main ingredient of your diet is probably a bad idea:
Edit: I agree that processed soy shouldn't be a "main" diet ingredient. But these guys freak out over using a little soy sauce.
For the record, soy sauce is fermented, which makes it relatively safe to eat. As Kresser points out in the article, fermentation significantly reduces soy's antinutrients.
I have 3 teen boys, all breastfed as babies. For one of them, him mom went nuts with soy milk right after his birth. (a screwy doctor suggested it) She drank crazy amounts of it. Sure enough, that boy clearly has boobs, and the others (same parents) do not.