re: the “Long lived population” on an Aegean island.
You are missing a small clue to why: during World War II and for several years afterward there was famine and disease in those areas, especially tuberculosis. So all the people with bad genes died.
True, if you survive TB and infectious disease, and stay on your low protein low fat diet due to poverty, you will probably live to be 90, because your cholesterol will be low, your fertility rate is low so you don’t die in childbirth, and you will remain thin, not just from the diet but from all that hard work trying to grow food.
but that same low protein low fat diet means that many people will have lousy immune systems and will have died.
No....the island is full of nutritious trees, plants and herbs.
Pine seeds, Wild cherries, blueberries, walnuts, figs, olives, mushrooms, various spinach and dandelion. Spouse was a child during that era.
Spouse spent last winter last year there in a small house on the top of hill with several weeks of snow.
She lived mostly on wild mushrooms that grow under the snow, (small round ones) or larger flat ones from the forest.
Local farmers have pigs and wild goats for sale.
Her sister once trapped a wild goat with a fishing net trap set up in her vegge garden....goat ended up in the cooking pot.