High-fat diet preference in developing and adult rats
1990
Rockwood, G.A. | Bhathena, S.J.
Diet preference tests in rats have yielded equivocal results, as some investigators have reported a strong preference for diets high in fat over those containing less fat, while others have failed to see this preference. To further explore this unresolved problem, two diet preference experiments were conducted. In Experiment 1, adult rats were maintained for at least three months on one of three powdered diets (control, high-carbohydrate or high-fat), Rats were then given a preference test with all three diets available. Animals from each group overwhelmingly preferred the high-fat diet. To determine whether this preference was also present in younger, developing rats, in Experiment 2, weanling animals were tested with the same three diets as in Experiment 1. As observed with adult animals, weanling rats also showed a strong preference for the high-fat diet. The idea that rats prefer a diet with a relatively high level of fat is supported. Possible explanations for these findings are discussed.
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