Soybeans are an important source of vegetable protein which is often used to replace animal proteins in the diet, suitable for all ages. Soybean is a legume that contains no cholesterol and has low saturated fat (or oil) content. Soybeans are the only vegetable food that contains all eight essential amino acids. In all, soybeans have about twenty amino acids. Soybeans are also a good source of fiber, iron, calcium, zinc, and B vitamins.