Fight Aging: 6 Secrets to Staying Young

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Stop eating so much

In Okinawa, Japan—home to some of the world's oldest people—centenarians stop eating when they're 80 percent full, says The Blue Zones author Dan Buettner, who studies longevity all over the planet.

They're onto something: Scientists at St. Louis University found that, while both exercising and eating less led to weight loss in the study's volunteers, cutting calories also lowered production of T3, a thyroid hormone that slows metabolism. The researchers believe that lower T3 levels may also slow the aging process.

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