Posted on Feb 27, 2013, 6 a.m.
Six-ounces of beef helps to renew new muscle protein, among middle-aged men.
Sarcopenia, or the gradual loss of muscle mass, is a common consequence of aging, and poses a significant risk factor for disability in older adults. Stuart M. Phillips, from McMaster University (Canada), and colleagues enrolled 45 men, average age 59 years, in a study that found that eating a six-ounce (170 g) serving of 85% lean ground beef resulted in significant treatment the rate of muscle protein synthesis following exercise. This determination is double the current recommended serving sizes of meat in Canada. Study authors propose that: "Ingestion of 170 g of beef protein is required to stimulate a rise in myofibrillar [muscle protein synthesis] over and above that seen with lower doses.”
Meghann J. Robinson, Nicholas A. Burd, Leigh Breen, Tracy Rerecich, Yifan Yang, Stuart M. Phillips, et al. “Dose-dependent responses of myofibrillar protein synthesis with beef ingestion are enhanced with resistance exercise in middle-aged men.” Applied Physiology, Nutrition, and Metabolism, 9 November 2012.