More Support for Vitamin D As Protective Factor in MS
But no association for in utero exposure to vitamin D and offspring risk of developing MS
MONDAY, Nov. 19 (HealthDay News) -- There is an inverse association between levels of 25-hydroxyvitamin D (25[OH]D) and the risk of multiple sclerosis (MS), but no association between gestational levels of 25(OH)D and offspring risk of MS, according to a study published in the Nov. 20 issue of Neurology.
Jonatan Salzer, M.D., from Umeå University in Sweden, and colleagues examined the correlation between vitamin D levels and MS risk using data from a nested case-control study involving two population-based biobanks with 291,500 samples from 164,000 individuals collected since 1975. Blood samples were identified from MS cases (192, with controls matched in a 2:1 ratio) and gestational samples were collected from pregnant women whose offspring later developed MS (37, matched with control mothers in a 5:1 ratio).
The researchers found that levels of 25(OH)D ≥75 nmol/L correlated with a significantly decreased risk of MS compared with levels <75 nmol/L (odds ratio, 0.39). Offspring exposed to gestational 25(OH)D levels of ≥75 nmol/L versus <75 nmol/L had no significantly decreased risk of MS (odds ratio, 1.8; 95 percent confidence interval, 0.53 to 5.8). During 1976 to 2005, the prevalence of 25(OH)D ≥75 nmol/L gradually decreased in controls.
"This study gives further support for the association between vitamin D status and MS," the authors write. "Our data suggest that vitamin D may act as a protective factor for MS somewhere between late pregnancy and young adulthood."
Several authors disclosed financial ties to the pharmaceutical industry.