If you want to lose weight, should your protein shake contain whey or casein? Is one better than the other? Or will they have much the same effect on weight loss? Protein and Weight Loss When it comes to getting lean, protein has a couple of important roles. First, it does a better job at filling you up than carbohydrate or fat. Eat a protein-rich diet, for example, and chances are you’ll end up eating fewer calories throughout the day. Protein also has a muscle sparing effect. If you don’t get enough protein while you’re on a diet, you’ll end up losing muscle as well as fat. On the basis of how quickly they’re digested, proteins are divided into so-called fast and slow proteins. And the two that come to mind whenever someone mentions fast and slow proteins are whey and casein (pronounced kay-seen), both of which come from milk. Whey is considered a fast protein because it’s rapidly absorbed by the body. Casein, on the other hand, is a slow protein that takes longer to break dow...
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