I actually heard a conversation once, of a middle aged man confronted by a “healthy lifestyle” true believer.
After hearing his pitch for copious exercise, self-denial, unpleasant food and not enough of it, teetotalism, and even to refrain from too much sex, the middle aged man bluntly informed the health nut of the following:
“The men and women from both sides of my family eat what they want, drink what they want, smoke or don’t, never exercise unless they are working, and we all either get killed young of accidents or gunfire, or only die after the age of 100.”
And the health nut enthusiastically chirped in that if they had made themselves miserable with mortification of the flesh their entire lives, they might have lived another five years!
The light was on, but nobody was home.
I think the health nut died while jogging, and the middle aged guy is now in his 70s. His best advice was “Avoid doctors unless you have broken something.”