My new FAVORITE article.
Diagnostic Crossover in Anorexia Nervosa and Bulimia Nervosa:
Implications for DSM-V
(Am J Psychiatry 2008; 165:245–250)
I actually think this whole study was amazing and definitely recommend reading it if you can (and I’m always a skeptic, so this is rare that I’d say this).  That said, I don’t think that the study does much for defining, validating, or invalidating the ED-NOS diagnosis.
 I think that this is brilliant, and should be used for actual diagnosis… not just as a measure in this study:
The Eating Disorders Longitudinal Interval Follow-up Evaluation was …