> After controlling for family medical history, age, education, diabetes, smoking and many other variables

Did not convince me.

And as I stated, I read a different (German) source, where definitively other possible correlations where named -- when one group contains clearly more rural people as the other, the whole statement that "no clear rationale" can be found, is questionable in my opinion, even when it is not political correct in some countries, that urban people are living less healthy lives.

This has nothing to do with click-bait or not. It is just very questionable to me, that the study is methodical clean.