Living longer is only part of the challenge of aging well. Preserving health along the way requires decisions about which new findings deserve attention and what they actually establish. A 2025 study published in Nature Aging found that older adults who took omega-3 supplements showed small signs of slower aging on certain DNA-based tests.
The researchers examined chemical markers on DNA using tools known as epigenetic clocks. Some measures suggested slower biological aging over three years, with additional effects from combining omega-3, vitamin D, and exercise on one clock. These findings provide a reason for further investigation. They do not establish that the interventions extend human lifespan.
