Vitamin D in pregnancy may prevent multiple sclerosis
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Researchers said they have found evidence that Vitamin D supplements for pregnant women in the world's colder, darker countries may stave off multiple sclerosis (MS) in their offspring.
The finding adds to a growing body of work showing a link between low Vitamin D levels and the debilitating disease, which sees the immune system attacking the body's own nerve fibres.
Data on more than 150,000 MS patients born in places north of 52 degrees, revealed a heightened risk for those born in April – a month preceded by a long period without sunlight, said a paper in the Journal of Neurology, Neurosurgery and Psychiatry.
Of the total, 13,300 were born in April compared to 11,600 in November -- a lower-risk month after summer in the northern hemisphere, British researchers wrote.
"Month of birth has a significant effect on subsequent MS risk," they said.
"This is likely to be due to ultraviolet light exposure and maternal Vitamin D levels.
They added, though, it could also be "any factor that varies in a similar seasonal and latitudinal manner".
The data was taken from individuals born between 1930 and 1980, from studies done in Britain, the United States, Italy, Israel, Finland, Scotland, Sweden and Canada – parts of which see little sunlight between the months of October and March.
About 100,000 people in Britain and about 400,000 in the United States are believed to suffer from MS, a disease that affects vision, movement, balance, sensation, bladder control and eventually also memory and thinking. There is no cure.
Study co-author Sreeram Ramagopalan from the Queen Mary University of London told AFP the findings amounted to an added MS risk of five percent for people born in April – about five extra births per million.
"Pregnant mothers need to ensure they are Vitamin D replete at all times," Ramagopalan said in an email exchange.
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