Document Detail

Behavioral effects of withdrawal from sweetened vegetable shortening in rats.
MedLine Citation:
PMID:  20096668     Owner:  NLM     Status:  MEDLINE    
This study tested the hypothesis that withdrawal from intermittent access to a sweet fat mixture would lead to an exaggerated motivation and craving for palatable food. Male Long-Evans rats were divided into three weight-matched groups based on access to sweetened vegetable shortening (SVS). Groups received 1-hour SVS access everyday (7D group), 1-hour SVS access intermittently, 3 days/week (3D group), or no SVS access (Naïve group). By the second week 3D rats began to display a disordered eating pattern. After 28 days on this feeding schedule SVS was withdrawn and anxiety was measured in an elevated plus maze. Motivation was assessed through operant performance for 10% sucrose on a progressive ratio schedule and craving was examined with a reinstatement test for lever pressing following extinction. Initial measures of anxiety and motivation found no differences among groups. However, when food was deprived overnight, there was a greater increase in lever pressing in the 3D group compared to 7D and Naïve rats. Thus a history of intermittent SVS access enhanced the reinforcing value of sucrose, but only under deprivation conditions. Interestingly, reinstatement of responding for sucrose was present only in the Naïve group. These findings suggest that a history of disordered eating may result in augmented motivation for palatable foods during a state of negative energy balance.
Heidi M McGee; Bekaluwa Amare; Amy L Bennett; Elizabeth A Duncan-Vaidya
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-01-22
Journal Detail:
Title:  Brain research     Volume:  1350     ISSN:  1872-6240     ISO Abbreviation:  Brain Res.     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-23     Completed Date:  2010-12-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0045503     Medline TA:  Brain Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  103-11     Citation Subset:  IM    
Copyright Information:
2010 Elsevier B.V. All rights reserved.
Department of Biological Sciences, Towson University, Towson, MD, USA.
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MeSH Terms
Analysis of Variance
Anxiety / chemically induced*
Body Weight / drug effects
Dietary Fats / administration & dosage,  adverse effects*
Dietary Sucrose / administration & dosage,  adverse effects*
Feeding Behavior / drug effects*
Motor Activity / drug effects
Rats, Long-Evans
Reinforcement (Psychology)*
Self Administration
Substance Withdrawal Syndrome*
Reg. No./Substance:
0/Dietary Fats; 0/Dietary Sucrose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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