Sample Sixty patients who have been diagnosed with BN or BED according to the Diagnostic and Statistical Manual of Mental Disorders Fifth Edition (DSM-5) and who have been found to be resistant to an initial structured program of CBT (Fairburn, Marcus, & Wilson, 1993) will participate in the study. Participants will be recruited from collaborating hospitals and health centers including Hospital de Bellvitge (Barcelona, Spain), Adult Mental Health Center of the Consorcio Sanitario de la Anoia (Igualada, Spain), Hospital Universitari Joan XXIII (Tarragona, Spain), Centro ABB (Tarragona, Spain) and the Instituto Auxologico Italiano (Milano, Italy). Suicidal ideation and diagnoses of other severe mental disorders (substance use disorders, bipolar disorder, psychosis) are exclusion criteria. Patients with active episodes of binge eating (and purging, in case of BN) during the last two weeks of the structured program of CBT will be considered for participation in the study. All prospective participants will be comprehensively informed about the characteristics of the study and will be required to sign an informed consent form. Authorization of the research ethics committees of the applicant organization (University of Barcelona) and the collaborating institutions will be required.