Testing the dual pathway model of ADHD in obesity: a pilot study.

INTRODUCTION There may be shared neuropsychological dysfunctions in ADHD and obesity. This study tested a neuropsychological model of ADHD (reward/executive dysfunctioning) in individuals with obesity. Furthermore, the association between co-morbid binge eating and reward/executive dysfunction was explored. METHODS Reward/executive dysfunctioning was assessed using both neuropsychological measures and questionnaires in individuals (aged 17-68) with obesity (N = 39; mean BMI = 39.70) and normal weight (N = 25; mean BMI = 22.94). RESULTS No significant differences emerged between individuals with and without obesity on the outcome measures. However, individuals with obesity and binge eating showed significantly more self-reported delay discounting and inattention than those individuals with obesity but without binge eating. When controlling for inattention, this difference in delay discounting was no longer significant. DISCUSSION Not obesity alone but obesity with binge eating was specifically associated with a mechanism often reported in ADHD, namely delay discounting. However, this effect may be more driven by inattention.