Analysis of data from four European case-control studies found that children given vitamin D supplements were about 30 per cent less likely to develop type-1 diabetes than those never given additional vitamin D.
This finding was supported by a cohort study showing that children diagnosed with rickets had an increased risk of developing type-1 diabetes.
Type-1 diabetes risk was found to be further reduced in children given higher doses of vitamin D, or who were given the supplements more regularly.
This is consistent with the higher rates of type-1 diabetes seen in higher latitude countries where endogenous vitamin D production is low due to lower levels of sunlight exposure.
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