People who spend more time in the sun as children subsequently have a lower risk of developing [multiple sclerosis (MS)](http://www.answers.com/topic/multiple-sclerosis “Look up multiple sclerosis on Ansers.com”), a US study shows.

The University of Southern California team suggest UV rays offer protection by altering the cell immune responses or by boosting vitamin D levels.

[Read](http://news.bbc.co.uk/2/hi/health/6906712.stm “Read the Story”) (BBC)