Can Omega-3s Help Protect Telomeres, the Body’s Aging Clock?

This review article looks at telomeres — the protective caps on the ends of chromosomes that naturally shorten as cells divide over time. Shorter telomeres are linked to aging and various age-related health conditions, and researchers have been investigating whether diet, including omega-3 fatty acids like EPA and DHA, might influence how quickly telomeres shorten.

The authors reviewed a mix of observational studies and randomized controlled trials. Several studies, including research in patients with coronary artery disease and in children with obesity, found that higher blood levels of omega-3 fatty acids were associated with longer telomeres, and a lower ratio of omega-6 to omega-3 fats was linked to longer telomere length. However, other studies, including one in a large group of women and one in older adults from the Mediterranean region, found no significant relationship between omega-3 levels and telomere length.

An early randomized trial giving adults omega-3 supplements for four months did not find a significant difference in telomere length between groups, though changes in the omega-6/omega-3 ratio in the blood were still linked to telomere length changes. The review notes that differences in how fatty acid levels were measured, single time-point sampling, and variation between study populations may explain the inconsistent results across studies.