"Scientists used a tool called Horvath's clock to measure something called epigenetic age. This tells them how old someone's body looks on the inside, based on changes in their DNA.

The results were surprising. On average, men who followed the full program ended up 2 years younger in biological terms. Those who didn't change their habits aged a bit " about 1 year. In some cases, the age reversal was much bigger " up to 9 years."

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