[MotleyGirl70]

but you never see fat runners

No, but I usually see alot of male runners in particular that look anorexic. Their bodies resemble that of prepubescent boys.

[ElTianti]

No, but I usually see alot of male runners in particular that look anorexic. Their bodies resemble that of prepubescent boys.
That depends on the runner.

Sprinters - not anorexic
Long distance - too thin, but their chosen sport requires a light weight build.

But that's beside the point, you're talking about people who run 50+ miles a week. To gain most of the benefits of running, you run as little as 15 miles a week

Most fat people really don't want to make the effort to lose weight. If they did, they would run.