Evidence suggests that deficits in affect regulation play an important role in the development and maintenance of binge eating disorder (BED). Thus, we aim to clarify whether BED symptoms can be reduced with the help of a training of general affect regulation skills. For this purpose, we randomly allocated N = 99 individuals meeting criteria for BED either to an affect regulation training (ART) or to a wait list control condition (WLC). Primary outcome is the reduction of binges during the treatment-vs.-waiting period as assessed with the Eating Disorder Examination (EDE) interview. Secondary outcomes include BED symptom severity at follow-up and change in emotion regulation skills. To clarify whether potential differences between groups regarding change in binge eating result from a greater increase of affect regulation skills in ART, we will test whether potential group differences regarding binges will be mediated by differences between groups regarding change in affect regulation skills.
Change of randomization procedure: Over the course of the study, serious difficulties occurred with regard to recruiting participants as quickly as necessary to avoid drop-outs due to participants' unwillingness to wait until eight individuals were recruited for randomization. To solve the problem, we switched from the original block randomization to a procedure in which the next patient eligible for the study was allocated to the treatment condition until the minimum group size of four was reached.
