Research has indicated that users of whey protein prior to training will illicit better results than those using otherprotein sources (or none at all). This is most likely due to the anti-catabolic and anabolic signaling effects of thebranched-chain amino acids present in whey protein—particularly leucine. Whey has a considerably higher concentration of BCAAs than other proteins.
There are many other benefits, as well. Studies have shown that pre-workout protein intake will increase resting energy expenditure by an average of 6-6.5% for up to 48 hours1. Pre-workout protein will also blunt cortisol through the day, an effect that wasn't seen in control groups that were fasted or had ingested carbs only.
Protein and amino acids also spare carbs. People often assume that when the body runs out of carbohydrate fuel, it switches to fatty acids for fuel. That process is typically too slow for high-intensity training. To provide fuel more quickly, amino acids are rapidly broken down and converted to sugar in a process known as gluconeogenesis. If those amino acids aren't in the blood supply, guess where they come from? Yep, your 18-inch biceps. For those of us who are dieting, some extra aminos in our bloodstream may help preserve our lean mass.
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