Scientists can now look at your DNA and get a read on how old your body looks biologically. They do it by measuring DNA methylation, chemical tags that change as you age. Some tests give you a biological-age score. Others tell you how quickly you’re aging. And some give you both.
You can test those measurements before and after you change your diet, supplements or lifestyle.
A 2026 analysis in Nature Medicine pulled together 51 human intervention studies and more than 3,000 samples. Researchers tested 16 different epigenetic clocks and found measurable changes in several of them after various interventions.
In the full version, I’ll cover:
The supplement that slowed three epigenetic aging clocks
The multivitamin trial that changed two biological-aging measures
Foods that may lower biological age
How to track changes over time
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