Post-Meal Activity and Eating Disorder Behaviors: An Ecological Momentary Assessment (EMA) Study

Area of Science:

• Clinical Psychology
• Psychiatry
• Behavioral Science

Background:

• Mealtimes are critical periods for distress and ritualistic behaviors in eating disorders (EDs).
• Current inpatient practices often involve enforced post-meal rest, which may inadvertently increase anxiety and ritual engagement.
• Ecological Momentary Assessment (EMA) offers a method to study real-time behaviors in naturalistic settings.

Purpose of the Study:

• To investigate the impact of structured light post-meal activity versus standard post-meal rest on ritualized eating behaviors in inpatients with EDs.
• To assess the feasibility and utility of EMA in capturing behavioral patterns during high-risk periods.

Main Methods:

• A 2-week counterbalanced within-subject crossover design was employed with 33 inpatients.
• Participants experienced one week of post-meal rest and one week of structured light post-meal activity.
• EMA prompts delivered six times daily assessed ritualized eating behaviors after meals.

Main Results:

• Compliance with EMA prompts was high (81.3%).
• Ritualized eating behaviors occurred in 30.8% of meal assessments during rest vs. 24.2% during post-meal activity.
• Participants were significantly less likely to engage in ritualized eating behaviors with post-meal activity (p=0.0002), indicating approximately a 50% reduction in odds.

Conclusions:

• Supervised light post-meal activity can effectively reduce ritualized eating behaviors in inpatient ED populations.
• This intervention may help interrupt maladaptive behaviors during the vulnerable post-meal period.
• EMA is a valuable tool for examining behavioral mechanisms and informing treatment strategies in real-time.