Researchers tracked more than 230,000 women for 40 years. Results show that women who were obese at 18 were twice as likely to develop MS.
Researchers believe the connection between teen obesity and MS may have something to do with vitamin D levels. Some past research has indicated the vitamin can help reduce the risk of MS.
But fatty tissue is suspected of reducing a person's vitamin D levels.
MS experts stress, more research in this area is still needed.