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Blue zones—like areas in Italy, Japan, Greece, California, and Costa Rica where the people have traditionally stayed active to age 100 or older—are some of the healthiest in the world. "In every Blue Zone, they eat less than we do, by at least 20%," Buettner says.

One trick for slashing portions: "Instead of putting big platters of food at the center of the table, fill each plate at the counter," Buettner says.

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