Protein is important. In fact, it’s vital for building the body you want. Protein helps decrease hunger, builds and maintains muscle, fortifies your bones, improves brain function, aids your immune system, and so much more. Plus, recent studies suggest that protein quality, or the total makeup of amino acids within a protein source, may become more important as you age. In short, protein is a super-nutrient. A do-it-all. A power player in how you use your body and what it looks like. We digested the most recent nutrition knowledge, talked to the smartest experts about the latest science, and sorted through a lot of nutrition B.S.—all to provide you with the most up-to-date information about protein right now.