 This study is designed as a 3 week, randomized, double blind, placebo controlled, trial. Olanzapine and modafinil will be titrated to 10mg and 200mg respectively. Feeding lab assessments will be conducted at baseline and endpoint. Assessments of hungersatiety, kilocalories consumed and weight will be obtained. Plasma ghrelin and PYY3-36 levels will be drawn at baseline and endpoint prior to breakfast and two hours post. 