Process Analyses of Impulsive Behavior in Binge-Eating Disorder During the Randomized Controlled IMPULS Trial.

Impulsivity represents a risk factor for patients with binge-eating disorder, and we therefore investigated the treatment process of impulsive behaviors including binge-eating episodes in the randomized controlled IMPULS trial. Using 8 weekly online questionnaires throughout the assessment period, we compared 41 patients participating in the IMPULS program, which emphasized impulsive eating behavior (IG), with 39 control patients who received no intervention (CG). We assessed the frequency of binge eating, other impulsive behaviors, situations in which such behaviors could be inhibited, and the execution of alternative behaviors. Results indicate a stronger binge-eating reduction in the IG compared to the CG at the fifth, seventh, and eighth treatment weeks. Overall, both groups reduced other impulsive behaviors. They did not differ in the amount of inhibited impulsive behaviors and showed similar alternative behaviors, "distraction" most frequently used. IG patients evaluated the IMPULS program as very helpful. The stronger reduction of binge eating in the IG and positive evaluation of the treatment indicate a specific treatment effect regarding impulsive eating behavior. The reduction of other impulsive behaviors across both groups, and the initial reduction of binge eating within the CG, could be explained by an increased degree of self-observation.

IMPULS: Impulsivity-Focused Group Intervention to Reduce Binge Eating Episodes in Patients with Binge Eating Disorder - A Randomised Controlled Trial.

BACKGROUND: Impulsivity is a risk factor for binge eating disorder, and binge eating (BE) equates to impulsive eating behaviour. Hence, we developed IMPULS, a cognitive behavioural group intervention focusing on impulsive eating. METHODS: We randomised 41 patients to the IMPULS group and 39 to the control group. The IMPULS group participated in the IMPULS treatment, while both groups completed weekly self-observations. We compared both groups concerning BE episodes in the past 4 weeks at the end of treatment (primary outcome). As secondary outcomes, we investigated eating pathology, depression, general impulsivity and body mass index (BMI) at the end of treatment and in a 3-month follow-up. RESULTS: The primary outcome failed, because BE episodes in the past 4 weeks were reduced in both groups at the end of treatment. At follow-up, the IMPULS group showed further improvement, contrary to the control group. The BE days/episodes in the 2 months before were overall reduced in both groups. Eating pathology was reduced in the IMPULS group at the end of treatment and partly in both groups at the follow-up. Depression was only reduced in the IMPULS group. General impulsivity and BMI did not change. CONCLUSIONS: The IMPULS study has a negative primary outcome. However, secondary outcomes indicate that the IMPULS treatment might be promising, as BE, eating pathology and depression were reduced in the IMPULS group. The initially reduced BE in the control group might represent a short-term effect from the self-observations. General impulsivity and BMI might need a longer time or more intensive treatment to change.