RESUMEN
Weight management requires resisting immediate temptations in one's environment (self-control) as well as the ability to persevere towards one's long-term goals despite minor setbacks (grit). This study sought to establish relationships between self-control, grit, and behavioral and health outcomes in the context of a couples-based weight management intervention. Couples (n = 64 dyads) in a behaviorally based intervention completed measures of self-control and grit at study entry and the end of treatment (6 months). Habit automaticity for self-weighing and exercise as well as objective weights were measured at baseline, 6 months, and 12 months (maintenance). Self-control and grit increased during treatment; these increases were significantly associated with greater self-weighing habit automaticity at 6 months. Baseline self-control, changes in self-control, and baseline grit were also associated with 6-month exercise automaticity. Only baseline grit was associated with weight loss maintenance. No partner effects were observed. Findings suggest that self-control and grit are malleable constructs that may play an important role in health behavior habits associated with weight management.ClinicalTrials.gov: NCT02570009, October, 7, 2015.