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Higher Vitamin D Linked to Reduced Diabetes Risk
Analysis pools results from 21 studies

FRIDAY, June 7 (HealthDay News) -- Higher blood levels of vitamin D are associated with a lower risk of type 2 diabetes, according to a meta-analysis published in the May issue of Diabetes Care.

Yiqing Song, M.D., Sc.D., from Brigham and Women's Hospital in Boston, and colleagues identified and performed a meta-analysis of 21 prospective studies examining the association between blood levels of 25-hydroxyvitamin D (25[OH]D) and risk of incident type 2 diabetes, involving 76,220 participants and 4,996 incident type 2 diabetes cases.

The researchers found that higher levels of 25(OH)D were associated with a lower risk of type 2 diabetes (relative risk, 0.62 comparing the highest and lowest categories). The risk fell by 4 percent for each 10 nmol/L increment in 25(OH)D levels. The association persisted regardless of sex, length of follow-up, study sample size, diabetes diagnostic criteria, or 25(OH)D assay method.

"Our meta-analysis showed an inverse and significant association between circulating 25(OH)D levels and risk of type 2 diabetes across a broad range of blood 25(OH)D levels in diverse populations," Song and colleagues conclude.

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