Soy allergy is food allergy that causes when someone eats the food that contain soybean.it is a hypersensitivity to dietary from soy causing an overreaction to the immune system which can lead to severe physical problems such as asthma. It is usually treated with an exclusion diet and vigilant avoidance of foods that may be contaminated with soy ingredients. The most severe food allergy reaction is called anaphylaxis and is a medical emergency requiring immediate attention and treatment with epinephrine. Soybean is scientifically called as Glycine max, commonly called soya bean is family of legume native from east asia, which has number of uses such as soybean normally are fat free prepares food with products like textured vegetables protein and also used as dairy substitutes and has significant amount of phytic acid, dietary minerals, and B vitamins soy vegetable oil, used in food and industrial applications.