This study demonstrates the preliminary feasibility, acceptability, and efficacy of two iterative case series using outpatient dialectical behavior therapy (DBT) for adults with anorexia nervosa (AN). Case series one had a low patient dropout rate of 16% and a modest effect size increase in body mass index (BMI) of $d = -0.50$. Case series two showed the effectiveness of an augmented DBT program for patients with AN focusing on overcontrolled emotions and behaviors, evidenced by a low treatment dropout rate of 11% and high patient ratings for suitability. Case series two resulted in effect sizes for BMI of $d = -1.12$ from baseline to post-treatment, which were sustained at 6-month ($d = -0.87$) and 12-month ($d = -0.21$) follow-ups. In summary, both standard and augmented DBT are effective for treating AN, with the augmented program potentially encouraging better long-term results.

https://doi.org/10.1002/eat.22360