I did find a study one time that compared various religious groups to find out who lives the longest. Adventists weren’t at the top. Interestingly, it was the Jews (don’t remember what flavor) that were at the top of the list that I saw. They’re not vegetarian but are particular about the animal products that they consume.
Adventists do like to tout their “health message”. And compared to the average SAD type, they do live longer. But so do a lot of other people that aren’t vegan or vegetarian. I’ve long thought that if being vegan or vegetarian was the path to the longest life, that vegans and vegetarians would be the largest group among centenarians. They are not. Kinda takes the wind out of the sails when the end result isn’t there quite like expected.
When I say these things, I am being hard on Adventists. I’ll admit to being one. But I also do NOT follow along in lockstep with things I don’t agree with and the vegan/vegetarian ideal is one of them. They haven’t kicked me out yet. I think they have some stuff right, i.e., clean air, sunshine, clean water, not overeating, not smoking, not drinking, stress management,… won’t throw the baby out with the bathwater. (Won’t get too crazy with non-diet stuff here but there is more. Like other things, I do the best I can with what situations I am presented and respond the best I can according to my personal beliefs.)