Protein is necessary for proper immune system function, digestion, hair and nail growth, and numerous other body functions. In fact, it is estimated that more than one hundred thousand different proteins exist within the human body. In this chapter, you will learn about the components of Soy protein, the important roles that protein serves within the body, how the body uses protein, the risks and consequences associated with too much or too little protein, and where to find healthy sources in your diet.