You should know that most of the claims of unusual proportions of very long life from these communities turned out to be bunk. Many researchers spent much more effort on present-day cultural and medical study than they did on discerning historical verification, and so got their numbers inflated by retroactively-produced proof of age in communities small and disconnected enough to not make this their priority a whole hundred years ago (Okinawa), or fraudulently-adjusted age in communities with enough lack of national oversight to enable community-wide retirement fraud (Sicily).

The "Blue Zone Diet(s)" is still probably better than the American Big Mac and Sugar Cup diet, but it's unclear if they're actually living longer than people on other potentially wholesome diets.