Dysregulation of brain reward systems in eating disorders: neurochemical information from animal models of binge eating, bulimia nervosa, and anorexia nervosa.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing preclinical animal model literature
PubMed 22138162 · doi:10.1016/j.neuropharm.2011.11.010
What was done
This narrative review synthesized neurochemical evidence from preclinical animal models of eating disorders—including binge eating, bulimia nervosa, and activity-based anorexia nervosa—to evaluate alterations in brain reward, motivation, and reinforcement pathways.
What was found
The abstract reports qualitative neurochemical directions without numerical data: - Binge eating of palatable foods is associated with alterations in dopamine (DA), acetylcholine (ACh), and opioid systems in reward pathways. - Bulimia nervosa models suggest palatable food bingeing releases DA, while purging behavior blunts ACh release that would typically signal satiety. - Anorexia nervosa models indicate restricted food access enhances DA reinforcement upon feeding. - Activity-based anorexia models (restricted feeding combined with wheel running) show alterations in mesolimbic DA and serotonin signaling.
Why it matters
Mapping neurotransmitter alterations in animal models helps clarify how specific eating disorder behaviors perturb brain reward pathways, offering potential mechanistic targets for future pharmacotherapies.
Limits
The findings are derived from preclinical animal models that cannot fully capture the psychological, cognitive, and sociocultural complexity of human eating disorders. The abstract provides no search strategy, study count, or quantitative effect sizes. Neurochemical alterations may reflect physiological consequences of extreme feeding behaviors rather than primary causes.
Cited by
- supports Eating disorders involve disruptions across serotonin, dopamine, and opioid signaling pathways.