Time of birth, exposure to sun, and age at onset of MS

Yesterday I read about this study in Neuroepidemiology (dated: 18.03.2010) and I thought I’d mention it here. The research in question is yet another one that “links the sun to MS” ; )

The authors of this study assessed the effects of time and place of birth on the age at onset of MS symptoms. The results point to the link between exposure to the sun (and thereby to vitamin D) and MS. Their findings suggest that patients with a relapsing form of MS, who were born in winter and whose birthplace was in low solar radiation areas, had disease symptom onset on average 2.8 years earlier than those born in seasons other than winter and in medium- and high-solar radiation areas. They conclude that early life exposure to geographical and seasonal factors, which are probably related to the protective effect of sunlight (and hereby vitamin D), is associated with a delay in MS symptom onset.

They finalize by stressing that other larger studies are necessary in order to examine the period-specific (from conception to adulthood) environmental factors that are associated with MS susceptibility.

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