Previous studies have shown that people who live near the equator are less likely to get MS than those at higher latitudes. This difference can be explained by exposure to more sunlight and higher levels of vitamin D.
According to a report published in Neurology, Robyn Lucas from The Australian National University and colleagues studied 216 adults who had just began experiencing the first symptoms of MS between 2003 and 2006.
They also find a comparison group of nearly 400 people from the same area in Australia, which fits with the subject in the age and gender, but have no signs or symptoms of MS.
Participants in both groups were asked how much time they spend in the sun and where they have lived at various points in their lives. Skin damage from sunlight and vitamin D levels in their blood were also examined.
On average, people with the first signs of MS have been exposed to "UV dose" in small amounts, based on how much time they have spent in the sun and how close to the equator where they had lived during their lives.
People with early MS symptoms, less than half have high levels of skin damage caused by sun exposure, with levels of vitamin D is 5 to 10 percent lower than those without MS.
"Our study is the first that looked at sunlight exposure and vitamin D status at the first symptom that may precede the development of MS," Lucas said as reported by Reuters Health, on Tuesday (8 / 2).
Recent research does not prove that the sun is very little or have low vitamin D levels lead to MS, and while the author tries to show that both sunlight exposure and vitamin D affects the risk of MS itself, some experts doubt that this is possible.
"They may have an independent role, but the reality is very difficult to sort out," said Alberto Ascherio, who studied the relationship between vitamin D and MS at the Harvard School of Public Health and was not involved in this research.
He noted that the authors do not know the blood levels of vitamin D levels of the participants during their lives.
Because sunlight exposure associated with a higher risk of skin cancer, more time outside (to get the sun) is not always better. Also does not mean that everyone should be an abundance of vitamin D, according to health experts.
The main message from this study, Lucas said, is that "a small amount of sun exposure ... which is often done, possibly optimal, both to maintain the level of vitamin D and to other health effects."
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