Cholecystokinin-octapeptide suppresses stress-induced eating by inducing hyperglycemia.

Intracerebroventricular administration of cholecystokinin-octapeptide (CCK-8) in unanesthetized, unrestrained rats suppressed stress-induced eating and produced hyperglycemia. Prior adrenalectomy markedly reduced the hyperglycemia effect of intraventricular CCK-8 and also decreased the suppressive effect of CCK-8 on stress-induced eating. Our data are compatible with the anorectic effect of CCK-8 being secondary to the hyperglycemia it produces.