#112 How To Slow Biological Aging With a Multivitamin, Vegetables, & Omega-3 | Dr. Steve Horvath

June 7, 2026

AI Summary

5 min read

Dr. Steve Horvath, the scientist who pioneered the Horvath epigenetic clock, returns to FoundMyFitness to clarify what biological aging clocks actually measure, what they miss, and which interventions have the strongest evidence for slowing or reversing epigenetic age. The conversation is grounded in a crucial distinction: there is no single "biological age." Different clocks track different biology—mortality risk, inflammation, metabolic health, or the pace of aging—and they do not always agree. Understanding which clock is being used, and what it was trained to detect, is essential for interpreting any claim about reversing aging.

What the Clocks Actually Measure

Horvath explains that epigenetic clocks are not interchangeable. The first-generation Horvath pan-tissue clock was designed to estimate chronological age. Second-generation clocks like PhenoAge and GrimAge were built to predict mortality risk and are sensitive to inflammation, metabolic dysfunction, and smoking history. GrimAge, in particular, uses methylation to estimate biomarkers like C-reactive protein and smoking pack-years, and it has proven to be the strongest mortality predictor in large studies. The Dunedin Pace clock, developed by Dan Belsky, was constructed differently: it tracks the rate of change in physiological markers like BMI, waist-to-hip ratio, and glucose impairment over time, making it an "

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Show Notes

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The strongest anti-aging strategy may be less about dramatic reversal and more about removing what accelerates aging in the first place. In this episode, Dr. Steve Horvath maps out the science behind biological age and how aging clocks are changing the way researchers evaluate longevity interventions. He also explains why omega-3s, a daily multivitamin, and sufficient vegetable intake stand out as evidence-backed, compounding levers for shifting biological age over time.

Timestamps:

(00:00) Introduction
(07:05) What exactly is biological aging?
(12:39) Do all aging clocks measure the same thing?
(18:22) PhenoAge vs. GrimAge—how methylation reveals mortality risk
(20:27) Why GrimAge is a powerful mortality predictor
(24:10) How your epigenome remembers long-term stress
(28:08) Can parents pass stress to offspring through the epigenome?
(30:12) Why standard aging clocks fail in sperm
(31:35) Can lifestyle changes reverse GrimAge?
(33:24) How DunedinPACE tracks your aging speed
(37:26) Which clock is best for testing longevity interventions?
(39:47) Can methylation clocks replace long-term mortality studies?
(43:33) Which interventions most reliably reverse epigenetic age?
(46:31) Can someone reverse biological age by 5 years in 7 months?
(50:49) Can GrimAge predict when you'll die?
(52:36) Why a younger GrimAge doesn't mean more years of life
(57:21) What epigenetic clocks fail to capture
(1:03:26) Why aging clocks measure more than just inflammation
(1:06:02) Does younger blood rejuvenate the whole body?
(1:09:52) Can calorie restriction really slow biological aging?
(1:14:00) Do GLP-1 drugs reverse epigenetic age?
(1:17:29) Can a daily multivitamin slow epigenetic aging?
(1:26:11) Omega-3, vitamin D, and exercise—which slows aging best?
(1:34:01) Does correcting vitamin D deficiency reverse age acceleration?
(1:36:29) Vegetables vs. exercise—which matters more for epigenetic age?
(1:42:04) Does red meat accelerate epigenetic aging?