In a large clinical trial, Tufts University researcher Bess Dawson-Hughes and colleagues found that vitamin D supplements reduced diabetes risk only in people with certain genetic variants, pointing toward a more personalized approach to prevention. Dawson-Hughes et al. found prediabetic adults with certain variations in the vitamin D receptor gene had a 19% lower risk of developing diabetes when taking a high daily dose of vitamin D. Dr. Dawson-Hughes...
