There are a few small spots in the world where people live longer (and stay healthier) than in the rest of the world, such as the highlands of Sardinia and the Nicoya Peninsula in Costa Rica. According to Dan Buettner, people living in these "blue zones" share nine qualities, from eating more plant-based foods rich in antioxidants to making family a priority. Buettner highlights five blue zones around the world and the centenarians living there to teach readers who want to live to 100 how they can improve their chances.

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