[groggler]

Given that exercise in moderation reduces cancer risk, I find this take a bit odd. There are plenty of environmental problems that only fit women would be highly exposed to. I.e. due to demographic differences in sport popularity, a fit male is less likely to spend significant time on a synthetic yoga mat in a generally high pollutant indoor environment with a high breathing rate.

[joseda-hg]

Moderation being the keyword, a marathon is definitionally about doing more than moderate exercise

There's a lot of body stress on repairing, maintaining and improving endurance

Maybe that skyrockets cellular division which would maybe would explain some of the impact?

[groggler]

Still.. if you asked me why marathon runners had bowel cancer I would say that they eat more low fiber carbs than is possible for a normal person..

The theory that exercise is harmful seems more like a fanciful wish than a probability given other correlation in environment and behavior where much of our environment is poorly tested and probably harmful.

[stevesimmons]

I find this a curious hypothesis, to say the least.

So I'm a marathon runner (ran a 3:08 marathon this morning, actually, at age 55). The carbs I eat are neither excessive, nor low fibre.

And all the endurance athletes I know are extremely aware of their diets and the importance of eating the right mix of high quality foods.

[groggler]

https://www.runnersworld.com/uk/nutrition/recipes/g29413408/...