Yep, even periodic fasts seem to extend life. People can also cut their meat consumption to say once or twice a week and probably see the same benefits non meat eaters get. It would probably help Vegans and vegetarians to periodically eat meat as well for their health. People want to go to the extreme on everything, all or nothing, and it isn't needed.
That's what I think is the "secret". Simply moderation in all things. I mean, even alcohol has benefits in moderation and I'm even going to propose the unthinkable, even smoking in moderation. I say this because stress is one of the big killers in society. It goes unnoticed because it's hard to quantify but tell me that you've never known someone that paved his way to an early grave due to being so stressed out. All we see is that he died from a heart attack. Cigar, cigarette smoking, a shot of whiskey at the end of the day... sometimes does a body good. Even keeping it bbing related, 200mg/wk Test Cyp versus 5grams plus all the other gear to be huge. One enhances the quality of life and the other brings you closer to the grave or at the very least prematurely ages you.
My cousin is a dermatologist and avoids the sun like a Vampire. What kind of life is that? Sure we shouldn't be baking out in the sun for hours but how can anybody believe that we were suppose to avoid all sun.