Dan Buettner is the longevity expert who coined the term "blue zones," to describe communities with the longest-living residents in the world.Dan Buettner has made it his life's work to research the world's longest-living people. The 63-year-old coined the term "His research covered a variety of factors, including diet.
"It's hard to eat really healthy when you go out, no matter where you go," he says. "I try to eat plant-based."
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