Abstract
Sustained overeating was induced in rats with repeated daily injections of protamine zinc insulin. The hyperphagia and hypophagia upon termination of insulin treatment were directly related to the amount of insulin that had been administered. The intake was regulatory since animals adjusted food consumption appropriately to compensate for caloric intake from glucose solutions, and they maintained stable caloric intake by reducing the weight of food ingested from a high fat diet. Overeating was unmodified by the use of an equicaloric high protein diet even though total weight gain was reduced. Injections of cycloheximide and dexamethasone prevented protamine zinc insulin induced overeating.
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