Not yet investigated
What we have so far
The older muscle needs more leucine to respond at all — which is why protein recommendations built from nitrogen balance are too low for the people who need them most.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.