Exendin-9,39 and Satiety After Bariatric Surgery

Subjects will be studied on 2 occasions, in random order. During the saline study they will be infused with saline.

Subjects will be studied on 2 occasions, in random order. During the Exendin-9,39 study day they will be infused with Exendin-9,39. Exendin-9,39 blocks the actions of specific hormones called incretins, that are produced in the gut in health and in larger quantities after gastric bypass surgery.