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  • Title: Energy utilization of a low carbohydrate diet fed genetically obese rats and mice.
    Author: Thenen SW, Mayer J.
    Journal: J Nutr; 1977 Feb; 107(2):320-9. PubMed ID: 833691.
    Abstract:
    Genetically obese Zucker rats, ob/ob mice and non-obese littermates were fed low carbohydrate (2%, 48%, and 50% of energy as carbohydrate, protein, and fat, respectively) and control (60%, 19%, and 21%, as carobhydrate, protein, and fat) diets. The oxidation of the energy components of these diets was measured by adding D-[U-14C]glucose, L-[U-14C]glutamic acid, and glyceryl tri-[1-14C]oleate to test meals given intragastrically and collecting respiratory CO2 for 4 hours. The animals responded to the low carbohydrate diet by oxidizing less glucose and more glutamic acid, but these amounts were proportional to dietary carbohydrate and protein composition, In contrast, the animals oxidized both higher amounts and percentages of glyceryl trioleate when fed the low carbohydrate diet. Obese Zucker rats oxidized less fat than non-obese rats when fed both diets, while obese mice oxidized fat to the same extent as non-obese mice. Feeding the low carbohydrate diet significantly increased body weight in the obese mice, but not in obese rats and non-obese mice and rats. The effect of obesity and the low carbohydrate diet on food intake, serum glucose and lipid values and CO2 production are also reported.
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