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Decreased food intake rather than zinc deficiency is associated with changes in plasma leptin, metabolic rate, and activity levels in zinc deficient rats( small star, filled).
MedLine Citation:
PMID:  11988406     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This study investigated the hypothesis that the reduced food intake and poor weight gain in zinc deficient rats is due to: increased plasma leptin concentration, increased physical activity and/or increased metabolic rate. Weanling rats were assigned to three groups: controls fed ad libitum (C), zinc deficient (ZD), and pair-fed controls (PF), and tested in a metabolic chamber and activity monitor at baseline and weekly for four weeks. At the end of the study, all groups were compared for differences in plasma leptin concentrations. ZD and PF animals had markedly reduced food intake and weight gain. ZD had reduced stereotypic and locomotor activity compared to PF animals and both groups demonstrated an abolished peri-nocturnal activity spike and were much less active than controls. This was associated with a reduced total metabolic rate by day 30: ZD (0.73 +/- 0.07 kcal/hr, p = 0.0001) and PF (0.83 +/- 0.06 kcal/hr, p = 0.0001) groups vs. controls (1.82 +/- 0.09 kcal/hr). Plasma leptin concentrations in ZD (1.55 +/- 0.06 &mgr;g/L) were lower than controls (2.01 +/- 0.18 &mgr;g/L, p < 0.03), but neither ZD nor controls were statistically different from PF (1.68 +/- 0.05 &mgr;g/L). Both low leptin concentrations and low metabolic rates in the ZD and PF rats were associated with decreased food intake rather than zinc deficiency. The reduced food intake and poor weight gain observed in zinc deficient rats could not be explained by elevated leptin concentrations, hypermetabolism, or increased activity. Low serum leptin concentrations, hypometabolism, and decreased activity are more likely the result of the anorexia of zinc deficiency.
Authors:
Lisa M. Gaetke; Robert C. Frederich; Helieh S. Oz; Craig J. McClain
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  The Journal of nutritional biochemistry     Volume:  13     ISSN:  1873-4847     ISO Abbreviation:  J. Nutr. Biochem.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-May-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9010081     Medline TA:  J Nutr Biochem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  237-244     Citation Subset:  -    
Affiliation:
Department of Nutrition and Food Science, University of Kentucky and the Lexington Veterans Administration Medical Center, 40506, Lexington, Kentucky, USA
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