Vitamin supplement may delay diabetes in select groups, researchers say

This material may not be published, broadcast, rewritten, or redistributed. ©2026 FOX News Network, LLC. All rights reserved. Quotes displayed in real-time or delayed by at least 15 minutes. Market data provided by Factset. Powered and implemented by FactSet Digital Solutions. Legal Statement. Mutual Fund and ETF data provided by LSEG. Fox News senior medical analyst Dr. Marc Siegel reacts to a new study showing one in three American teenagers have prediabetes. High-dose vitamin D supplements could help reduce diabetes risk among certain groups, according to new research from Tufts University. In a large clinical trial, researchers performed genetic testing of more than 2,000 U.S. adults with prediabetes after they received 4,000 units per day of vitamin D supplements, then compared them to a placebo group. An earlier study showed no significant reduction in diabetes risk in the group receiving vitamin D supplementation, but when the researchers looked closer, they found a benefit for certain genetic groups. High-dose vitamin D supplements could help reduce diabetes risk among certain groups, according to new research from Tufts University. (iStock) For the new study, the Tufts res