A 78-year-old doctor says he's reversed his age by 20 years. Here are the 4 diet principles he follows to stay young.

A 78-year-old doctor says he's reversed his age by 20 years. Here are the 4 diet principles he follows to stay young.

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An expert in healthy aging who claims to have reversed his biological age by 20 years shared his diet principles with Business Insider.

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