Aside from the possible increase in breast cancer risk, soy is thought to depress thyroid function, and is one of the most likely products in your supermarket to be genetically modified (GMO). And unless made from organically grown soybeans, soybeans are one of the most highly pesticide-laden types of produce.

And all of this sucks because I really like tofu and don't eat a lot of meat so do appreciate its protein content. I eat it sparingly now and then, but not as much as I would prefer for the reasons stated above. I also like soy sauce.