How To Slow Biological Aging With a Multivitamin, Vegetables, & Omega-3 | Dr. Steve Horvath
In a Nutshell
Dr. Steve Horvath explains that epigenetic clocks like GrimAge and DunedinPACE reliably track mortality risk and intervention effects by measuring DNA methylation patterns that integrate inflammation, metabolic stress, and other aging processes. Multivitamins, omega-3 supplementation, vegetable intake (via carotenoids), and weight loss each slow epigenetic aging by a few months over 1–3 years, with stronger effects in people starting from poorer health. While clocks detect real biological changes from these accessible interventions, they miss some aging mechanisms like cellular senescence and telomere attrition, so they should complement—not replace—other health measures.
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Dr. Steve Horvath, professor of human genetics and developer of the Horvath epigenetic aging clock, explains that his core question as a longevity researcher is what drives aging. The Horvath clock has become a landmark finding in biomedicine for measuring biological aging.
The COSMOS trial showed that participants given a multivitamin slowed their brain aging by 2.1 years. Mental health and social relationships also emerged as surprising factors that translate to measurable changes on the DNA molecule in blood.
Biological age refers to the phenomenon that people of the same chronological age have different mortality and morbidity risks, or appear older or younger than peers. Longevity researchers and geroscientists measure biological age using technologies such as step counts, gait speed, imaging data for brain age, and molecular markers.
Horvath works on epigenetic marks, specifically DNA methylation. The signal for aging and mortality is very strong in methylation patterns. Biological age measurement requires examining multiple levels: molecular readouts (gene expression, proteome, metabolome, glycome), biochemical readouts (blood biochemistry), organ function measures (fibrosis), and functional measures (VO2 max, gait speed, daily living activities, frailty).
Horvath's work was motivated by understanding aging even in people who optimize lifestyle and prevention. Methylation clocks track damage accumulation that occurs despite healthy behaviors and that drives organ dysfunction years or decades later. The goal is to create a precise tool for identifying interventions that can reverse the age of individual cells, organs, and the whole organism.
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