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Protein is the foundation for your muscle building diet.  If you fail to grow on 1 gram of protein per pound, or if you're sore for more than a couple of days after training, bump your intake up to 1.5 grams (300 grams for the 200 pound bodybuilder).  Most of it should come from whole food sources in conjunction with consuming 2-3 protein shakes per day.  Don't forget about that crucial window of opportunity post- workout.