Just to stand on the fence here... keep in mind that "quality of life" is subjective. If a person is 50 lb overweight, doesn't exercise, but doesn't experience ANY physical limitations in what he/she WANTS to do and is perfectly happy in that... I would argue they are living a "high quality of life". Just because they can't run a marathon and lift the back end of a Volkswagen (at the same time?) doesn't mean they suffer from any less quality of life when compared to a person who can. IF any person wants to do something, but they can not do it because of physical limitations DUE to their decisions (I.E. if they made different decisions, they could do this).. THEN they are experiencing a reduced quality of life.