Soy comes from the soybean that is now used in the United States in so many forms and derivatives that the list would be exhaustive. Typically most think of soy as in Soy Sauce, but soy can be processed into everything from milk to animal feed to oil. Soy yields the largest amount of vegetable protein per acre than any other vegetable making it an important cash crop. Unfortunately, soy is in the Top 8 list of foods that produce allergic reactions. It is a common allergen producing symptoms in the population of those who consume it in its various derivatives and forms. Symptoms can range from mild to life-threatening (anaphylaxis) and can be acute (immediate) to chronic (perpetual if soy is continued to be consumed).