Rationale: Age related muscle loss (sarcopenia) is assumed to be related to the impaired postprandial muscle protein synthetic response to protein and/or amino acid administration in the elderly vs the young. Co-ingestion of carbohydrate increases post-prandial insulin secretion. Insulin affects skeletal muscle blood flow and may therefore affect substrate availability and postprandial muscle protein synthesis. However, it is unclear whether the response to the combined intake of protein and carbohydrates is different in elderly compared to young subjects.