Tas wrote:
However, one of the hardest training runners I ever knew was found to have blockages of over 80% in the arteries around the heart area when he was in his 50’s and still running.
Maybe the genes you inherit have more to do with longevity (and looks) than any activity one gets up to in one’s lifetime.
No doubt genetics has a good deal to with atherosclerosis. Dana Carvey, for example, is a pretty good runner -- and Aggie -- but that didn't stop him from having sky-high cholesterol levels and bypass surgery at a fairly young age. I understand that high cholesterol runs in his family.
But if you could control for genetics, I think you'd find that runners have cleaner arteries than less active folks with the same genetic background. We know that running raises HDL a few ticks, and as others have mentioned, it's associated with better dietary habits, which would reduce cholesterol and LDL. And atherosclerosis is just the beginning. Running obviously helps prevent obesity and type II diabetes and all its associated ailments.
So eat your mileage. It's good for you.