New research from Tufts University indicates that high-dose vitamin D supplements may lower diabetes risk for specific genetic groups with prediabetes.
Recent findings from Tufts University suggest that high-dose vitamin D supplements could play a role in reducing the risk of diabetes among certain genetic groups. This research involved a large clinical trial that included over 2,000 U.S. adults diagnosed with prediabetes.
Participants in the study received a daily dose of 4,000 units of vitamin D supplements, which were then compared to a placebo group. While an earlier study did not show a significant reduction in diabetes risk among those receiving vitamin D, further analysis revealed potential benefits for specific genetic variants.
The Tufts researchers focused on three common variants of the vitamin D receptor gene to determine how outcomes varied among participants. They found that individuals with certain versions of this gene, specifically the AC or CC variants, were 19% less likely to develop diabetes when taking vitamin D compared to those who received a placebo. Conversely, participants with the AA genetic variant did not experience any benefits from the supplementation.
The mechanism behind this effect appears to involve the vitamin D receptor, which is present in various tissues throughout the body, including the pancreas, the organ responsible for insulin production. These findings were published last week in the journal JAMA Network Open.
Bess Dawson-Hughes, the study’s lead author and a senior scientist at the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, emphasized the significance of these results. “Our finding is an example of the emerging science of precision nutrition or precision medicine, in which an intervention can be tailored to the needs of individuals according to their genetic makeup and disease risk,” she stated.
Dawson-Hughes also highlighted the practicality of vitamin D supplementation as a preventive measure. “Taking a vitamin D supplement daily is an easy, inexpensive, and generally safe approach to reducing diabetes risk,” she noted. “In principle, this could involve a single, relatively inexpensive genetic test.”
Despite these promising findings, the researchers acknowledged several limitations in the study. They pointed out that this research was a secondary analysis rather than a primary randomized comparison. “Like any other first observation, this finding needs to be replicated in a future study,” Dawson-Hughes cautioned.
The study’s focus on individuals with prediabetes may limit its applicability to broader populations. The researchers stressed that the results observed in specific genetic groups require further validation before they can be integrated into clinical practice.
Importantly, Dawson-Hughes advised against individuals starting high doses of vitamin D as a diabetes prevention strategy based solely on this study. “It is too early to make specific recommendations for the general population,” she said.
Current guidelines recommend that most adults receive about 600 IU of vitamin D daily for those aged 1 to 70, and 800 IU for individuals over 70. However, previous research has indicated that excessive vitamin D intake can pose risks, particularly for older adults. Dawson-Hughes noted, “There is some evidence, from my laboratory and others, that the relatively high blood levels of 25-hydroxyvitamin D needed to achieve the diabetes risk reduction have been associated with an increased risk of falling in older adults.” She advised older adults against taking a daily dose of 4,000 IU of vitamin D without consulting their healthcare providers first.
This study also raises an intriguing question: Could vitamin D supplementation in adults with responsive genotypes help lower the risk of developing prediabetes, the precursor to Type 2 diabetes? Dawson-Hughes underscored the importance of this inquiry, stating, “This is important because prediabetes is not a benign condition. Adults with prediabetes also have an increased risk of cardiovascular disease.”
As research continues, the implications of these findings could pave the way for more personalized approaches to diabetes prevention, particularly for those with specific genetic profiles.
These insights were reported by Fox News Digital.