There's also two other factors: fast twitch muscle genetics and EBV (Epstein Barr virus: mono). Almost everyone gets the latter, but only recently are they finding that it really is a long term problem because "you're just tired" and "get more exercise" were the only responses in the treatment que. Some days I can work all day long and just get blisters, other days, I have to force my body to stand up. That's not diet or exercise or sleep: it's neurological, and the medico-insurance complex just ain't a-gonna mash THAT button until they are pretty sure you are a short timer.

PS The other common factor between runners and medics is that they like telling people what to do ;) #Vegans #Volunteers #OPM (other people's money)