Do obesity, birth control pills raise risk of multiple sclerosis?

The role of the so-called "obesity hormone" leptin and hormones used for birth control in the development of multiple sclerosis (MS) is examined in two new studies. For the obesity study, BMI was calculated for 210 people with MS and 210 people of the same age and sex who did not have MS at ages 15 and 20 and at the time of the study. The study found that people who are obese at age 20 are twice as likely to later develop MS as people who are not obese. For the birth control hormone study, resea...