Momentary associations between perceived stress, dietary restriction, and eating behaviors in adolescents

Objective Adolescence is a critical period where growing autonomy over food choices shapes long-term health behaviors. While stress and dietary restriction are linked to eating behavior, prior research has examined trait-level stress, leaving momentary processes less understood. This study investigated associations between momentary perceived stress and eating behaviors, with dietary restriction tested as a moderator. Methods Participants (N = 74 ages 14–17) from Los Angeles County completed a 10-day ecological momentary assessment protocol that included three to seven random smartphone prompts per day and initiated additional prompts during eating episodes. Perceived stress and dietary restriction were assessed at random prompts, while eating behaviors were assessed during eating-episode prompts. Eating behavior outcomes included dysregulated eating (loss of control eating and overeating) and food consumed (pastries/sweets and fruits/vegetables). Time-lagged generalized linear mixed models tested within- and between-subjects associations. Results Neither within-subject perceived stress nor its interaction with restriction significantly predicted outcomes. No associations were found for predicting fruit and vegetable nor pastry/sweet consumption. However, in the main effect model, greater within- and between-subjects dietary restriction predicted subsequent loss of control eating, and higher between-subjects restriction predicted increased pastry/sweet intake. Conclusions The findings highlight dietary restriction as a key acute predictor of adolescents’ loss of control eating, whereas momentary perceived stress did not emerge as a precipitant. Findings underscore the importance of screening for restrictive eating patterns and suggest that pediatricians and caregivers should monitor adolescents at risk. Future research should refine momentary stress assessment and test potential moderators of associations.