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. 2023 Dec;56(12):2328-2335.
doi: 10.1002/eat.24077. Epub 2023 Oct 18.

Examining trait-like factors as predictors of state-level responses to food intake in women with bulimia nervosa, purging disorder, and controls

Elizabeth H Fitzgerald  1 , Keanan J Joyner  2 , Pamela K Keel  1
Affiliations

Examining trait-like factors as predictors of state-level responses to food intake in women with bulimia nervosa, purging disorder, and controls

Elizabeth H Fitzgerald et al. Int J Eat Disord. 2023 Dec.

Abstract

Objective: Theories suggest that elevated negative affect and weight/shape concerns explain both who is affected by bulimic symptoms as well as when bulimic symptoms occur, suggesting that individual differences predict within-subject differences. However, few studies have tested this theoretical premise.

Method: In the present study, participants (N = 119) diagnosed with bulimia nervosa (N = 57), purging disorder (N = 31), and non-eating disorder controls (N = 31) completed measures of negative affect and weight/shape concerns and later made momentary affect and weight/shape concerns ratings before and after an ad lib meal.

Results: State negative affect and weight/shape concerns increased post-meal. No moderating effect of trait negative affect was observed for state affect. In contrast, between-subject differences in weight/shape concerns moderated within-subject increases in state weight/shape concerns. Diagnostic group did not account for this effect.

Discussion: Findings point to viable treatment targets for disordered eating. Targeting elevated weight/shape concerns early in interventions could facilitate reductions in purging after food intake for bulimia nervosa and purging disorder.

Public significance: In the present study, individual differences in weight/shape concerns at baseline predicted greater increases in state weight/shape concerns following eating. These effects were maintained when considering possible differences related to presence and type of eating disorder. Results suggest that targeting weight/shape concerns earlier in treatment may be important for reducing maladaptive responses to eating across eating disorders.

Keywords: affect; bulimia nervosa; purging disorder; weight concerns.

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Conflict of interest statement

Conflict of Interest: The authors have no conflict to declare.

Figures

FIGURE 1
FIGURE 1
Ad lib meal model.
See this image and copyright information in PMC

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