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The effects of morphine on diet selection are dependent upon baseline diet preferences

The effects of morphine on diet selection are dependent upon baseline diet preferences

Pharmacology Biochemistry and Behavior 37(2): 207-212

ISSN/ISBN: 0091-3057

PMID: 2080183

DOI: 10.1016/0091-3057(90)90322-9

It has been reported that morphine causes a selective increase in the intake of dietary fat. Because we have noted considerable variability among rats in their preferences for carbohydrate and fat, we reasoned that the effect of morphine on diet selection may differ in fat-preferring vs. carbohydrate-preferring rats. Male Sprague-Dawley rats were given ad lib access to seperate sources of carbohydrate, fat and protein (Experiment 1), or to a carbohydrate/protein and a fat/protein diet (Experiment 2). After daily baseline intakes of the diets were determined, all rats were tested for feeding responses to subcutaneous injections of morphine (0, 2 and 10 mg/kg). Significant positive correlations were found between baseline daily intake of a given diet and the effect of morphine on the intake of the diet. Generally, morphine increased carbohydrate intake in carbohydrate-preferring rats, the increased fat intake in fat-preferring rats. These rats suggest that the effect of morphine is to increase intake of a preferred diet rather than to increase intake of a specific macronutrient.

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Accession: 007896450

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