like gambling. here is how one researcher describes it. >> it works on a chemical glutamate. so there is thought that it may be responsible for people having obsesstive compulsive disorder and these compulsive behaviors. >> heather: dr. mark siegle is a member of the fox news medical a team and professor of medicine at nyu medical center and joins us now with more. hello. >> hi, heather. >> heather: tell us about this study. first of all, my big question, how could the two possibly be related, alzheimer's and any sort of compulsive disorder? >> as that doctor said, there is a hormone in the brain and it's conceivable that lacking it, that this drug does, could conceivably cut down on obsesstive compulsive behaviors, including been a shopaholic, which 80% of shopaholics are women. >> gregg: really? >> heather: i don't like shopping. i'm kind of the weird one in that. i don't like it at all. >> you're too busy work.