Vitamin D may delay aging and reduce risk of diabetes and heart disease, finds new clinical study
Recent research suggests that higher
vitamin D intake
could slow down aging-related changes in the body. A study published in the American Journal of Clinical Nutrition found that
vitamin D supplements
reduced the shortening of telomeres, protective DNA caps linked to aging and disease risk.
What the research found
The study focused on about 900 participants from a larger trial. Those who took
vitamin D
supplements showed less telomere shortening over four years than those who took a placebo. Shorter telomeres are connected to aging and greater risks of infections, type 2 diabetes, and heart diseases. The researchers believe vitamin D's role in reducing inflammation may explain these benefits. Omega-3 supplements, tested alongside vitamin D, did not have a significant effect on telomere length.
Co-author JoAnn Manson said, 'Vitamin D is not a panacea.' She added, 'Some chronic diseases do not appear to be mitigated by vitamin D supplementation.' She advised focusing on a
healthy diet and lifestyle
, rather than relying only on supplements. However, vitamin D might help people with higher inflammation or those at risk of inflammation-related chronic diseases.
Study design strengthens results
The trial was randomized and double-blinded, meaning participants were randomly assigned to either the vitamin D or placebo groups, and neither the participants nor researchers knew who received which. This design helps ensure fair comparisons and reliable results.
Should you take vitamin D supplements?
However, experts warn against rushing to buy vitamin D supplements. People can get enough vitamin D from their diet and sunlight. This analysis comes from the large VITAL trial, which involved nearly 26,000 mostly older adults over five years. Participants took 2,000 IUs of vitamin D3 and 1 gram of Omega-3 daily, mainly to test effects on cancer and
heart disease
prevention.
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Sources of vitamin D
Besides sunlight, vitamin D can be found in fatty fish like salmon, sardines, and mackerel. Egg yolks, beef liver, and UV-treated mushrooms also provide vitamin D. Fortified foods such as milk, yogurt, and cereals contribute to daily intake.
This research points to vitamin D's potential role in slowing some aging processes but emphasizes balanced diet and lifestyle as essential.
Risks of excess vitamin D intake
Taking too much vitamin D can cause harmful effects. Excess vitamin D may lead to a condition called hypercalcemia, where calcium builds up in the blood. This can cause nausea, weakness, kidney problems, and in severe cases, heart issues. Experts advise sticking to recommended doses and consulting a doctor before starting high-dose supplements, especially since too much vitamin D does not provide extra benefits and can be risky.
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