Appropriate keywords and medical subject headings terms were identified and included the following: “oxytocin,” “eating disorders,” “eating behaviors,” “hypothalamus,” “hypothalamic ventromedial nucleus,” “amygdale,” “area postrema,” “nucleus of the solitary tract,” and “dorsal motor nucleus of the vagus nerve.” References were screened according to a hierarchical strategy by title and abstract, and full text. This evidence concerns the gene OXT and eating disorder.