This research study will test if oxytocin, delivered by nasal spray, will promote weight loss
in children, adolescents, and adults with Hypothalamic Obesity as compared to a placebo. The
study is divided into two parts. During the first part, subjects will receive either oxytocin
or placebo. In the second part, subjects will "cross-over" to receive the other treatment -
either oxytocin or placebo. During study visits participants will do blood tests, physical
exams, metabolic testing, a MRI scan, and some surveys and questionnaires.