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Effects of dietary sugar and of dietary fat on food intake and body fat content in rats

Effects of dietary sugar and of dietary fat on food intake and body fat content in rats

Growth 51(1): 64-73

The long term ingestion of a sugar-rich diet (low fat) caused severe obesity in adult rats. In a separate experiment, the habitual consumption of a fat-rich diet (40% kcal from fat) also caused severe obesity. Severe obesity developed in both groups of animals even though they did not overeat. Voluntary food intake for the sugar-fed rats averaged 28,314 .+-. 756 calories/rat per 55 wks which was similar to the value of 28,884 .+-. 953 calories/rat per 55 wks for the fat-fed rats. However, both values were lower than that of 32,869 .+-. 588 for the control rats eating Purina chow. Despite a lower caloric intake, carcass fat averaged 45 .+-. 1% for rats eating the sugar-rich diet and 46 .+-. 2% for rats eating the fat-rich diet, but only 33 .+-. 2% for rats eating a diet of Purina chow. These results provide evidence that severe obesity can develop in the absence of hyperphagia in animals eating a sugar-rich or fat-rich diet. Finally, a rat model for severe obesity is presented in which carcass fat ranged from 18% (lean) to 61% (severe obesity) using dietary intervention alone at critical stages of the animal's life.

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Accession: 001580445

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PMID: 3623194

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