Soy is one of those foods that seems to be just about every where. It’s a main ingredient in a significant number of processed foods at the grocery store. Most common protein bars and drinks include some version of soy. And of course there’s a list of familiar forms like soy sauce, tofu, and the whole bean itself (edamame). But because a food is widely used is by no means a sign of its worthiness as part of the human diet. So what’s the deal? Should we eat soy?