A researcher who studies 100-year-olds has revealed the two foods that could add years to your life.Dan Buettner has spent decades analyzing the diets of the world's longest-lived people residing in the fabled 'Blue Zones' to reveal their secrets.His work has found that two grocery store-available items costing as little as a $1 each are staples in centenarians' diets: black beans and walnuts.
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