Effects of stress on eating behaviours in adolescents: a daily diary investigation.

The current study aimed to use ecologically valid assessments to examine within- and between-person associations between adolescents' daily stress and unhealthy eating behaviours. Design: Daily diary assessments were used to investigate whether daily perceived stress and negative life events were associated with naturally occurring eating behaviours across the span of one week in a community-based sample of 88 adolescents. Results: Logistic hierarchical models demonstrated between-person effects of stress on eating, such that adolescents who endorsed greater perceived stress and more daily negative life events, on average, across the one-week period, also reported elevated rates of craving tasty foods and trouble stopping the consumption of tasty foods. Within-person findings showed that some eating behaviours were associated with day-to-day, within-person fluctuations in stressful experiences. On days marked by higher than usual perceived stress (relative to one's own average levels during the week), adolescents reported an increased likelihood of eating to cope with difficult emotions. Conclusions: Findings indicate that daily fluctuations in stress may contribute to unhealthy eating behaviours during adolescence, and that associations between stress and eating behaviour may differ depending on whether they are assessed within-person or between-persons.