The soy from soybeans is used to make soy milk, tofu, and soy sauce, as well as a variety of meat and dairy substitutes and many other foods. Soybeans (edamame) are sometimes eaten whole.
While soy is a common ingredient in food products (especially processed foods), not everyone can eat it. Mild symptoms of soy allergy include hives and itching. Severe reactions include anaphylaxis.