Vitamin D May Slow Cells’ Aging
Vitamin D supplements may help prevent the loss of telomeres, DNA sequences that shrink with aging, a large study shows. But the health effects aren’t yet clear
A new study suggests vitamin D supplements might slow cellular aging by protecting telomeres.
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Vitamin D supplements might slow cellular aging by preventing the loss of telomeres, DNA sequences at the ends of chromosomes that shorten in old age, a new study suggests. The health effects of these findings aren’t yet clear.
Vitamin D had been touted as a panacea for a number of health conditions, from cardiovascular disease to bone loss. In 2020 a large randomized controlled trial of supplementation instead found benefits only in a few conditions, particularly autoimmune disease and advanced cases of cancer, says the new study’s co-author JoAnn Manson, a professor of medicine at Harvard Medical School and a principal investigator of that large trial, called the VITamin D and OmegA-3 TriaL (VITAL). The new study is an analysis of data from VITAL. Its finding could explain the protective effect of vitamin D supplements on these specific aging-related diseases, Manson says.
“If is replicated in another randomized trial of vitamin D supplements, I think this could translate into clinical effects for chronic diseases of aging,” she says. “We’re already seeing that vitamin D does reduce inflammation; it reduces advanced cancers and cancer deaths, as well as autoimmune diseases. This could provide a biological mechanism.”
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In the VITAL project, researchers enrolled nearly 26,000 women aged 55 or older and men aged 50 or older, and they randomly assigned participants to take vitamin D supplements, fish oil supplements, a combination of both or a placebo. For the new study, published today in the American Journal of Clinical Nutrition, the scientists looked at a subset of 1,054 participants who lived close enough to Harvard’s Clinical and Translational Science Center in Boston to have their blood drawn three times over four years so researchers could measure their telomeres.
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