In place of soy whether you want to use it for vegetarian purposes, protein purposes, estrogenic purposes, etc.
Okay, why do you think that? That's not a challenge, by the way; I'm curious what people think of soy.
IMO, soy's biggest detriment is that it is among the top GMO/engineered crops. I think it's estrogen effect on men is more than a little exaggerated.
I don't advocate any form of soy for the majority of protein intake for anyone, but I feel that it has fallen into that category of foods that are inaccurately assigned blanket statements of negativity.