Soybeans are a type of legume native to Asia and have been part of traditional Asian diets for thousands of years. Today, soy is widely consumed, as a plant-based protein but also as an ingredient in many processed foods. Many vegetarians and vegans rely on soy as a main protein source. Like corn and wheat/gluten, soy is abundantly present in the American diet. You can find it in milk substitutes, dressings, sauces, chocolate, personal care products, cakes, crackers, and even infant formula. Soybeans are also used as animal feed, so it is present in your meat products if you are not buying grass-fed or pasture-raised. Let’s look at some of the evidence for and against eating soy.