Abstract
The effect of glycerol on rats food intake was determined when it was administered either via bolus gastric intubation, or by a continuous 24 hr infusion into the aorta. Both of these treatments resulted in a suppression of the 24 hr food consumption to an extent which was greater than that accounted for by the caloric value of the administered metabolite. Gastric loading with urea solutions equiosmotic to glycerol or with glucose solutions equicaloric to glycerol were less effective than glycerol in reducing the 24 hr food intake. The time course effect on food intake varied between gastric loading with glycerol and with equicaloric glucose solutions, with the former usually exerting a more delayed and longer lasting effect. Continuous intraaortal infusions of glycerol were more effective than glucose solutions in suppressing 24 hr food intake even though the latter had twice the caloric value of the former. Our data suggest that the action of glycerol on food intake is not mediated through its conversion to glucose. The possibility that glycerol may participate in a lipostatic control mechanism of food intake is discussed.
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