Bernice is 26 years old, weighs about 250 pounds, and is extremely dissatisfied with her body. She finds herself stuck in a pattern of, at least four times a week, secretly and within minutes devouring several dozen doughnuts, even if she's not all that hungry. After consuming the doughnuts, Bernice feels shame and disgust at what she has just done. Bernice would MOST likely be diagnosed with: