The states known for “hippie”/“granola” attitudes, which largely align with the advice given here, tend to live longer than the states that don’t (scroll through the list in [1] to see this). Usually I would insist on a study, but the effect is so striking, and the mechanism by which it would work is so obvious, that I think this simple list is enough. And I’m sure there are studies too, I’m just too lazy to find and link one.

[1] https://en.wikipedia.org/wiki/List_of_U.S._states_and_territ...