Protein is an important component of every cell in our body. Our body uses Protein to build and repair tissues. We also use Protein to make enzymes, hormones, and other body chemicals. Protein is an important building block of our bones, muscles, cartilage, skin, and blood. The Protein needs per day as given inThe DRI (Dietary Reference Intake) is 0.36 grams of protein per pound of body weight. This means 54 grams per day for a man weighing 150 lbs and 43 grams per day for a woman weighing 120 lbs. Following are twenty important sources of Protein: