Soya bean belongs to the legumes family. Soya bean has been an imperative protein source in orient for more than 5000 years. As soybean matures in the pod, it ripens into dry and hard beans. Although most of the soybeans are yellow, a few rare varieties are also there which are of black, green or brown color. Soy foods contain omega-3 fats, essential polyunsaturated fats. Omega-3 fats are linked to a lower risk of cardiovascular disease. Soy foods are a great source of vitamins and minerals. B-vitamins, iron, zinc and an array of antioxidants round out the nutritional qualities of soy.