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Wednesday

 

Sun Exposure, Vitamin D May Protect Against MS


























Image Source: PINTEREST

In a new study of people with multiple sclerosis (MS), researchers discovered that those who had spent their teen years in the summer sun had a later onset of the disease compared to those who did not. The findings suggest that sun exposure and vitamin D may have a protective effect against the development of the disease.

“The factors that lead to developing MS are complex and we are still working to understand them all, but several studies have shown that vitamin D and sun exposure may have a protective effect on developing the disease,” said study author Julie Hejgaard Laursen, M.D., Ph.D., of Copenhagen University Hospital in Denmark. “This study suggests that sun exposure during the teenage years may even affect the age at onset of the disease.”

For the study, 1,161 people with MS in Denmark completed questionnaires and gave blood samples. They were divided into two groups based on their sun habits during their teen years: those who spent time in the sun every day and those who did not spend time in the sun every day. They were also asked about their use of vitamin D supplements during their teen years and how much fatty fish they ate at age 20.

MS patients who had spent time in the sun every day had an average onset of MS that was 1.9 years later than those who did not spend time in the sun every day. A total of 88 percent of the participants were in the sun every day group. They developed MS at an average age of 32.9, compared to 31 for those who were not in the sun every day.

“It appears that both UVB rays from sunlight and vitamin D could be associated with a delayed onset of MS,” Laursen said. “However, it’s possible that other outdoor factors play a role, and these still have to be identified.”

The findings also showed that a person’s weight at age 20 affected disease onset as well. Those who were overweight at age 20 developed the disease an average of 1.6 years earlier than those who were average weight and 3.1 years earlier than those who were underweight. Eighteen percent of the participants were overweight; they developed the disease at an average age of 31.2.

Laursen said earlier studies have shown a connection between MS risk and obesity in childhood and the teenage years. Obese people are known to have lower blood levels of vitamin D.

“The relationship between weight and MS might be explained by a vitamin D deficiency, but there’s not enough direct evidence to establish this yet,” Laursen said.

Laursen further cautioned in drawing conclusions too soon as there were a few limitations to the study.

“A limitation of the study is the risk of recall bias because participants were asked to remember their sun, eating, and supplement habits from years before,” Laursen said.

“In particular, someone with a long history of MS and onset of the disease at an early age, may wrongly recall a poor sun exposure. Additionally, only Danish patients were included into the study, so there should be caution when extending the results to different ethnic groups living in different geographic locations.”

The findings are published in the journal Neurology.

Story Source: The above story is based on materials provided by PSYCHCENTRAL
Note: Materials may be edited for content and length

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