Abstract
Experimental obesity produced in rats by stereotaxic lesions of the ventromedial hypothalamus (VMH) resulted in hyperphagia, polydipsia, polyuria, decreased urine osmolality, and enhanced excretion of total solute and urea. A 24-h water deprivation test revealed the inability of VMH-lesioned rats to increase urine antidiuretic hormone (ADH) excretion. Thus, destruction of the VMH area appears to be accompanied by impairment of ADH secretion, resulting in a diabetes insipidus syndrome that is partially masked by food restriction and improved by treatment with exogenous ADH.
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