Fast-digesting whey means it is emptied from the stomach quickly, resulting in a rapid and large increase in plasma amino acids. This translates into a quick but transient increase in protein synthesis, while protein breakdown is not affected. Whey also has higher levels of leucine, a potent amino acid that stimulates protein synthesis. Whey protein is superior at augmenting protein synthesis rapidly, but this positive effect is short-lived. Consuming repeated doses of whey allows for sustained high levels of blood amino acids and repeated bursts of protein synthesis that provide superior effects on muscle protein balance.
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