 Cognitive Behavioral Therapy for Bulimia Nervosa CBT4BN is a research program funded by the National Institute of Mental Health and conducted by the UNC Eating Disorders Program and the University of Pittsburgh Medical Center. Cognitive Behavioral Therapy CBT is an evidence-based treatment and the gold-standard for treating bulimia nervosa. The current study aims to compare two forms of CBT: face-to-face group therapy and online group therapy via cbt4bn.org. 