American Journal of Clinical Nutrition, May 2008 This article concludes: "There are compelling data to support the ability of dietary protein to acutely stimulate muscle protein synthesis in aging individuals. However, there is insufficient longer-term research with defined health outcomes to specify an optimal value for protein ingestion." Lead author is Douglas Paddon-Jones, of the UTMB department of physical therapy. Dr. Elena Volpi, of the department of internal medicine, is a co-author.