Plasma cholecystokinin (CCK) before and after a jejunoileal bypass operation in obese patients with reference to appetite regulation.

Plasma cholecystokinin (CCK) rose significantly after a 15-min liquid test meal in six normal controls and six obese patients, both before and after a jejunoileal bypass operation. Post-prandial rises in the obese patients were virtually unaffected by the operation, and tended to be higher in the obese patients than in the normal controls. It is therefore concluded that hormonal CCK is unlikely to be a mediator of satiety signals from the digestive tract in obese persons.