ADHD and eating disorders have been indicated to be highly comorbid disorders, however research is still unclear of mediators in the comorbidity. Research has shown executive functions to have associations with both disorders, despite this, there is currently limited literature aiming to determine executive function as a potential transdiagnostic cognitive marker in the comorbidity. Biological, social and cognitive factors have been proposed to explain the comorbidity, yet research is still limited in its investigation of the role of executive function in the comorbidity. To address this gap in the literature, I plan to examine whether executive function mediates ADHD and eating disorder relationship at 24/25 years of age.