Development of, and recovery from, activity-based anorexia in female rats.
Level 5 - mechanism / opinion, no new human data
Animal model experiment (CEBM Level 5)
PubMed 14637226 · doi:10.1016/j.physbeh.2003.08.008
What was done
Female rats given free access to running wheels were monitored daily for food intake, wheel running, body weight, and estrous cyclicity across baseline, a restricted-feeding phase (food access limited to 2 hours/day), and a recovery phase. A control group housed without running wheels was monitored for food intake, body weight, and estrous cyclicity under the same feeding conditions.
What was found
The abstract reports no numerical values or statistical metrics. Qualitatively, wheel-access rats consumed more food at baseline than non-wheel controls. During restricted feeding, both groups consumed similar amounts of food, but only wheel-access rats developed activity-based anorexia marked by increased running, rapid weight loss, and disrupted estrous cycles. Recovery was characterized by hypoactivity and hyperphagia; normal estrous cycles resumed once lost body weight was regained. Post-recovery hyperphagia persisted only during non-estrous phases, whereas hypoactivity resolved.
Why it matters
It characterizes the female-specific behavioral and reproductive dynamics of activity-based anorexia in an animal model, showing that ovarian cycle stages directly modulate compensatory feeding behavior during weight restoration.
Limits
The abstract provides no sample size, variances, or numerical effect sizes. As an animal study, findings cannot be directly extrapolated to human anorexia nervosa, and specific orexigenic or satiogenic molecular markers were not reported.
Cited by
- supports Female rats on major calorie restriction become significantly more active in their cages compared to controls.