The following article is by John Berardi, and is an excellent summary and explanation of the role of protein in the diet, paticularly with regard to athletic training. His website is www.precisionnutrition.com. Dr John Beradi is a leading authority on Sports Nutrition in the US.
Two recent studies have shaken up the weight lifting and athletic worlds with respect to protein intake. For those research geeks among you, here are the references:
Ingested protein dose response of muscle and albumin protein synthesis after resistance exercise in young men. Am J Clin Nutr. 2009.
A moderate serving of high-quality protein maximally stimulates skeletal muscle protein synthesis in young and elderly subjects. Journal of the American Dietetic Association, 2009.
So, what did these landmark studies show?
Well, the first study showed that when college-aged weight-trainers drink 0g, 5g, 10g, 20g, or 40g of protein after a weight training session, muscle protein synthesis is stimulated maximally at the 20g dose. Interestingly, there were no further increases in muscle protein synthesis at the 40g dose.
Similarly, in the second study, when young and elderly volunteers were given 30 or 90g of dietary protein in a single meal, the 30g dose maximally stimulated muscle protein synthesis. Again, there were no further increases in muscle protein synthesis at the 90g dose.
20-30 Grams and No More
Oddly, since the publication of these two studies, I’ve read no less than 2 dozen articles and blog posts suggesting that these two studies definitively close the case on protein intake. Indeed, some authors have even suggested that we’re ignorant wastrels if we dare eat more than 20-30g of protein in a single sitting.
Here are a few quotes:
“So basically what you’re saying is that we don’t need to consume any more than 20g of high quality protein after exercise. You could get that in a 500ml serving of milk…This info is really going to piss off a bunch of internet keyboard jockeys.”
“I’ve cut back on the amount of protein I eat during most meals…No more slogging down 50-60g in a sitting. “
“Looks like 3 eggs post workout is just as effective as drinking a protein shake. Plus all that extra shake will be wasted.”
And so on…
Is Muscle The Only Reason We Eat Protein?
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