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Vitamin D may prevent diabetes in people with certain genes

The benefit was seen only in people with AC or CC vitamin D receptor variants, while about 30% with AA variants saw no reduction in risk.

  • Tufts University researchers discovered that daily Vitamin D supplements can lower diabetes risk in prediabetic adults, though effectiveness depends on specific genetic variations in the vitamin D receptor gene.
  • The large D2d study originally tested 4,000 units of Vitamin D daily versus placebo in more than 2,000 prediabetic adults but found no significant risk reduction across all participants, prompting genetic analysis.
  • Genetic analysis revealed that 30 per cent of the population carries the AA variation and did not respond to treatment, while those with AC or CC variations saw a 19% lower diabetes risk.
  • This discovery suggests a personalized approach for the 115 million Americans with prediabetes, potentially involving an inexpensive genetic test to identify patients most likely to benefit from supplementation.
  • Researchers cautioned against taking high doses without medical advice, as current guidelines recommend 600 IU for those under 70 and 800 IU daily for those older, since excessive intake can be harmful.
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An American study examined the effects of vitamin D in adults with prediabetes. It doesn't help everyone, but it can delay the development of serious complications for many.

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The Independent broke the news in London, United Kingdom on Thursday, April 23, 2026.
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