The Claim
In healthy older men, the postprandial rate of muscle protein synthesis following ingestion of 25 g of whey protein is consistently between 0.025% and 0.030% per hour, irrespective of prior 14-day protein intake, indicating a ceiling effect in the anabolic response to a single protein dose.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In healthy older men, consuming 25 grams of whey protein after a meal increases muscle protein synthesis at a rate of 0.025% to 0.030% per hour, and this rate does not increase even if they consumed more protein over the previous 14 days.
See the scientific wording
In healthy older men, the postprandial increase in muscle protein synthesis after a 25 g whey protein meal is approximately 0.025–0.030% per hour regardless of prior 14-day protein intake, indicating a ceiling effect in the anabolic response to a single protein dose.
After eating protein, amino acids enter muscle cells and activate a molecular switch called mTORC1, which turns on the machinery that builds new muscle proteins. Once this switch is fully turned on, adding more amino acids does not make it work any faster, so muscle protein synthesis stops increasing even if more protein is eaten.
What the research says
1 studyEven if older men ate a lot or a little protein for two weeks, their muscles built new protein at the same rate after drinking the same protein shake — meaning there’s a limit to how much one meal can boost muscle growth.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.