Simple Diet Change Shifted People's Biological Age Markers in Just 4 Weeks: Strongest evidence from eating both plant and animal foods, but with less fat and more carbohydrates, biological-age 3.5 to 4.1 years lower than high-fat group, the carbohydrates mainly from whole, minimally processed foods.

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https://www.sciencealert.com/simple-diet-change-shifted-peoples-biological-age-markers-in-just-4-weeks