The other milk protein, casein, is also critical for gaining mass. Research shows that when subjects add casein to their postworkout whey shake, they gain more muscle mass than those who don’t. Another study found that while whey significantly decreases hunger and leads to reduced food intake, casein protein doesn’t. When you’re trying to pack on mass, you need to eat—a lot. Casein will help you get in plenty of protein and calories without filling you up

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