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1. The glucose metabolism of conscious lean and obese rats of the Zucker strain was studied by using doubly labelled glucose ([6-3H,U-14C]glucose) given by intravenous injection as a single dose. Fed animals were used, allowing the study to be made in conditions favouring active lipogenesis. 2. At any given prior food intake (consumption during preceding 24 h), the irreversible glucose replacement rate, R0, was considerably higher in the growing obese rat (4-6 months old) when both of these variables were scaled in terms of the total body water of the animals. 3. When scaled in a similar way, the minimal mass of glucose (Mmin.) was also larger in the obese rats. The mean transit time, t, through the pool did not differ significantly between the two groups, but there was a tendency for this to be shorter in obese rats. 4. There was no difference in the proportion of 14C (derived from metabolized labelled glucose) that recycled as [14C]-glucose after passing through the pyruvate pool in the two groups of rats if the rate of recycling of radioactivity (Rc) was expressed as a percentage of R0.

Glucose metabolism and recycling of radioactively labelled glucose in the Zucker genetically obese rat (fa/fa)