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Almonds for example are popular in Icaria and Sardinia, where they’re used in many dishes, while Nicoyans love pistachios, says Buettner.

The long-lived people of Loma Linda are part of a tight knit Seventh-day Adventist community that shuns caffeine and alcohol and eats a largely vegetarian diet; while in Icaria, red wine is a staple, and people eat a typical Mediterranean diet with plenty of fruits and vegetables and modest amounts of meat and seafood.

These areas, called “Blue Zones,” include the Nicoyan Peninsula in Costa Rica, the town of Loma Linda in California, and the islands of Okinawa in Japan, Sardinia in Italy and Icaria in Greece.

She went to the island of Icaria which, ravaged by Nazi occupation and civil war, had left its population on the brink of starvation.

Closer examination reveals "President" is the Greek title given to Icaria's civic leader.