> Adventists are by and large vegan or vegetarian (even after leaving the church I grew up in I'm still vegetarian), they don't drink and they don't smoke.
There is the problem all these studies: which of the above is the cause factor and which is irrelevant. In general vegetarians are likely to not smoke as well, so is it not smoking or is it their diet, or some mix - it is very difficult to tell.
It's a combination of factors most likely. A lot of the blue zones also have strong communities and that's another impact. The way a lot of meat-eaters eat is not overly balanced as well, our farming is likely problematic at the industrial scale.
A lot of the problems with seafood have nothing to do with the animals and everything to do with the way we're trashing our planet.
There is the problem all these studies: which of the above is the cause factor and which is irrelevant. In general vegetarians are likely to not smoke as well, so is it not smoking or is it their diet, or some mix - it is very difficult to tell.