These experiments tested the effects of subcutaneous (SC) and paraventricular nucleus (PVN) administration of the steroid receptor agonists, corticosterone (CORT), aldosterone (ALDO), RU28362, and dexamethasone (DEX), on food intake and macronutrient selection during the first h of the dark feeding period in the rat. Results indicate that CORT and the selective type II receptor agonist RU28362 specifically stimulate carbohydrate ingestion after SC or PVN administration, while DEX has no effect on feeding. This selective effect of SC CORT on carbohydrate ingestion is dose dependent, seen at doses ranging from 0.125 to 2.0 mg/kg. Moreover, the stimulatory effects of CORT and RU28362 on carbohydrate intake are observed in ADX rats but not in sham rats. This is in contrast to SC and PVN administration of the type I receptor agonist ALDO, which specifically enhances fat ingestion in both sham and ADX rats. These results, with both peripheral and central steroid administration, reveal selective effects of type I and type II receptor stimulation on fat and carbohydrate intake, respectively.
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