Joan, thanks for your comments. You might find this article very interesting: https://www.theatlantic.com/health/archive/2018/07/a-frightening-new-reason-to-worry-about-air-pollution/564428/
Apparently the heavy metals we ingest from car air pollution cause diabetes as well because of the inflammation. Diabetes isn’t just an issue of the obese. It is an issue for all of us. We don’t dare exercise close to exhaust for this reason. That raises a very interesting set of questions- where is it safe to exercise any more? This article forced me to rethink ever riding my bike on the road again without a face mask.
It’s a complex, messy issue indeed. I don’t have the answers. Lots of extreme athletes aren’t healthy at all- plenty of evidence to the contrary. That’s another whole article. I’m just trying my best to be as healthy as possible as I age. Extremes of anything- to your point- usually lead to injury. Been there. In Colorado it’s damned near a badge of honor in the same way that rugby players and hockey players show off lost teeth. Um…no thanks. I’ve done the over training thing and it’s stupid. It doesn’t prove anything to anyone other than you don’t know how to listen to your body when it screams at you.
I agree with the “moderate, sane” comment. Would that we were all a bit more of both. :-)