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Effects of Insulin Administration in Diabetic Rats on Food and Drink Rhythmic Schedules

In normal rats food and water intakes are associated in terms of time and quantity and their diurnal rhythms are synchronized. Intake behavior in streptozotocin-induced diabetic rats (ID) with marked polyphagia and polydipsia and in diabetic rats with continuous insulin administration (IT) has been studied. The daily percentages of food and water intakes during the dark phase were lower in IT than in control rats (C), being even lower in ID rats. However, all three groups showed circadian rhythmicity in food intake, although with less amplitude in the ID and IT animals compared to the C ones. A loss of the normal circadian rhythm of water intake was observed in the ID rats and although the insulin administration recovered circadian rhythmicity, it did not restore the temporal relations between food and water intakes. These results may indicate that the circadian pattern of water intake is more influenced by insulin than food intake. The daily pattern of this hormone may play an important role in the circadian modulation of the homeostatic mechanisms integrating both intake behaviors.