["Journal of Research on Adolescence, Volume 36, Issue 2, June 2026. ", "\nAbstract\nFood consumption can be an attempt to regulate negative emotion, positioning eating as a strategy for emotion regulation (EER). Given adolescents' developmental changes, such as sensitivity to stress and still maturing emotion regulation skills, adolescents may often rely on an accessible emotion regulation strategy, such as EER, when they experience stress. However, there are few studies of stress, emotion, and emotional eating in adolescents, and no studies have directly measured EER. The primary aim of this study was to determine whether adolescents' daily reports of EER were associated with academic, peer, and family stressors. Australian adolescents (N = 319, Mage = 13.9 years, 45% boys, 65% White, 85% born in Australia) completed a 7‐day daily survey via an app to report their EER, the biggest problem of the day (stressor), and stressor intensity and domain. They also reported how much stressors threatened their psychological needs for relatedness, competence, and autonomy (stressor threat) as described in self‐determination theory. Dynamic structural equation modeling (DSEM) was used to account for the multilevel data, while estimating within and across‐day associations between (1) stressor intensity and EER in one model and (2) stressor threat and EER in a second model. DSEM results showed that, after controlling for within‐day associations and stress chronicity, adolescents who rated their stress as more intense and threatening reported elevated EER the next day and, conversely, a greater degree of EER related to higher ratings of stressor intensity and threat the next day. In addition, reports of EER were elevated on days when adolescents reported peer or family stress compared to days without, with no difference for academic stress. Overall, EER and stressor intensity and threat are intertwined and bidirectionally influential, and interpersonal stress may be a particular risk for EER. Future research could determine whether EER foretells later disordered eating and declining well‐being.\n"]