Protein is an important component of every cell in your body, and you hair and nails are mostly made of protein. Your body also uses protein to build and repair tissues, to make enzymes, hormones, and other body chemicals.
Protein also serve as one of the body blocks for bones, muscles, cartilage, skin and blood.
Excess protein can not be turned into fat or even stored as fat, and protein meals satisfy your hunger far more than fats or carbohydrates do, keeping you fuller between meals.
Try lean beef, fish/seafood, beans, egg whites, dairy or protein powder