New research from Oxford University, published in the current issue of the journal Neurology, finds that the combination of low sunlight exposure and having a history of mononucleosis raises the risk for developing multiple sclerosis (MS). It's well-known that the incidence of MS is generally greater as you move away from the equator to regions that receive less sunlight. As such, MS is far more common in places like Scandinavia, Canada, and the Northern U.S. In the current study scientists used NASA satellite data on UV radiation exposure to calculate sunlight exposure in various parts of the UK, in addition to scouring all National Health Service hospital admissions records for cases of MS and mononucleosis. What they found was that 72% of all cases of MS patients lived in areas of relative low UV exposure and had a history of mononucleosis. It's believed that vitamin D (which is produced by our skin in reaction to UV light exposure) plays a protective role in preventing MS. However, more research is underway to further understand the association between mononucleosis and MS
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