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A preclinical model of binge eating elicited by yo-yo dieting and stressful exposure to food: effect of sibutramine, fluoxetine, topiramate, and midazolam

Abstract

Rationale

Preclinical models are needed to investigate the neurobiology and psychobiology of binge eating and to identify innovative pharmacotherapeutic strategies.

Objectives

A modification of the model based on the combination of cyclic caloric restrictions and acute stress was developed to further increase its face validity and reliability and, for the first time, to assess its predictive value.

Materials and methods

Four groups of female rats were employed: group 1 was normally fed and not stressed on the test day (25th); group 2 was fed normally but was exposed to an acute stress on day 25; group 3 was exposed to three cycles (4 days 66% of chow intake + 4 days food ad libitum) of yo-yo dieting but not stressed; and group 4 was exposed to cyclic yo-yo dieting and then stressed. All groups were fed highly palatable food (HPF) for 2 h on days 5–6 and 13–14. Acute stress was elicited by exposing rats to HPF, but preventing them from access to it for 15 min.

Results

The combination of cyclic food restriction and stressful exposure to food markedly increased HPF intake. Sibutramine and fluoxetine inhibited food intake in all conditions. Topiramate selectively inhibited compulsive HPF intake in rats submitted to caloric restriction and stress. Midazolam increased HPF intake.

Conclusions

Pharmacological results suggest that this model, in addition to face validity as an isomorphic model of human binge eating, is endowed with good predictive validity.

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Acknowledgements

This study was supported by the MURST, Rome, Italy (PRIN 2006 to M. Massi).

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Correspondence to Maurizio Massi.

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Cifani, C., Polidori, C., Melotto, S. et al. A preclinical model of binge eating elicited by yo-yo dieting and stressful exposure to food: effect of sibutramine, fluoxetine, topiramate, and midazolam. Psychopharmacology 204, 113–125 (2009). https://doi.org/10.1007/s00213-008-1442-y

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  • DOI: https://doi.org/10.1007/s00213-008-1442-y

Keywords

  • Binge eating
  • Caloric restriction
  • Environmental stress
  • Palatable food
  • Sibutramine
  • Fluoxetine
  • Topiramate
  • Midazolam
  • Female rats