Casein, on the other hand, is digested more slowly. So it’s ideal for providing your body with a steady supply of smaller amounts of protein for a longer period of time—like between meals or while you sleep. Since milk provides both, one big glass gives your body an ideal combination of muscle-building proteins.

Absolutely. In fact, milk is one of the best muscle foods on the planet. You see, the protein in milk is about 20 percent whey and 80 percent casein. Both are high-quality proteins, but whey is known as a “fast protein” because it’s quickly broken down into amino acids and absorbed into the bloodstream. That makes it a very good protein to consume after your workout