"I don't think the footballer diet or McDonalds qualify as digestible by that definition!
Just like obesity, over bulked up muscles are not a sign of good digestion.
"Take a look at long distance runners who are more often than not very skinny and light, many are able to continue their careers well into their 40's and beyond (male and female). You don't find many bulked up footballers still playing pro at age 45, their bodies have taken a sharp downward spiral before this time."
There is a difference between being able to simply run and continue getting banged up on the football field in your 40's!