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A study of Caucasian female twins prompts researchers to ask if public health advice to avoid the sun could be causing low vitamin D levels. Research produced by the Department of Twin Research and Genetic Epidemiology, King's College London, has shown that vitamin D levels are lower in fair-skinned Caucasian women than in Caucasian women with darker skin type. ... "It will be very interesting to see the results of the genetic analysis that the authors propose - especially of polymorphisms [genetic variants] in D binding protein. Variants in this protein associate strongly with skin colour, and also with vitamin D status, so may end up being explanatory.