I think you are reading into it too much, but I think you also might be missing that fit people may tend to make a LOT of different decisions in life than less fit people.

This is something I’ve been digging deep into and discovering a lot of seemingly safe assumptions turn out not to be.

I do expect exercise is a major factor here (perhaps the largest), but I’m acutely aware lately that these things, especially where nutrition could be a significant factor, are rarely ever cut and dry. It’s incredibly complex.

I don’t mean to say people shouldn’t exercise. I should have emphasized that, without a doubt. We know beyond any shadow of doubt that it improves quality of life dramatically for virtually everyone.