Oreo = Fat?

We met up with Puneet for dinner on Wednesday night. Being a future doctor (gynaecologist, in fact), we threw questions at him about so-and-so medicines, about childbirth, and how to lose/gain weight. He said that I should take Oreo's. Apparently, it has some kind of ingredient that can make one gain weight. "Realllllllllllyyyyyyyyyyy arrrrrrr?" Of course this sparked my interest larr... I don't know how true is this... Maybe someone can be kind enough to show me proof that Oreo's really does help in gaining weight?

In the meantime, no need to second guess what did I just buy and what am I munching on... ;)