Evidence suggests that the transition to postsecondary may be an important period of risk for engagement in disordered eating (DE). DE has been demonstrated to fluctuate and change course over time, however, very little research has examined factors that underlie these changes in DE. Higher negative urgency has been associated with elevated DE frequency, and preliminary evidence suggests that negative urgency may change concurrently with DE symptoms. Moreover, symptoms of depression, anxiety, and stress (DAS), are all associated with DE engagement, implicating an important role for negative affect in DE engagement. Despite this evidence, there is a paucity of literature examining the association between negative urgency and DE frequency over time, and how acute negative emotional states may moderate this relationship. The current study aimed to address this research gap by examining the association between negative urgency and DE frequency over time, and if symptoms of DAS moderate this relationship. It was hypothesized that DE frequency and negative urgency would share a significantly coupled relationship, and that symptoms of DAS would significantly moderate this relationship. Specifically, negative urgency would be more strongly coupled with DE frequency when DAS symptoms were high, as compared to when DAS symptoms were low. Two cohorts of first year undergraduate students (N = 645) completed monthly self-reports of negative urgency, symptoms of DAS, and DE frequency over their first two semesters of post-secondary study (7 months total). Multilevel Models revealed that indeed negative urgency and DE frequency share a statistically significant coupled relationship over time (p < .001), and that depressive symptoms moderate this relationship (p < .001) such that the coupled association between negative urgency and DE frequency was strengthened by depression. The current study is the first to examine how negative urgency and DE frequency co-vary over time and how negative affect moderates this association. The results illuminate the importance of considering interactions between established risk factors and negative emotional states in the engagement and frequency of DE behaviours, and offers preliminary insight into correlates of change in DE frequency over time. / Graduate