12 Oct 2018 --- Whey protein may be the best protein source for older adults wishing to rebuild lost muscle mass. The findings, published in the American Journal of Clinical Nutrition, identified that when it comes to seniors, proteins are not created equal. In the study, only whey protein was found to increase lean muscle mass and muscle protein synthesis during recovery from short-term muscle loss. Rebuilding muscle mass in seniors is of immense importance as they are more likely to be hospitalized and suffer from weakened muscle and strength conditions, such as sarcopenia.