Effect of Gastric Bypass Surgery on Pancreatic Islet and Incretin Function - Follow-up Study

To examine pancreatic islet function and incretin function during intravenous and oral stimulation >2 years after gastric bypass surgery in patients with normal glucose tolerance. We hypothesize that islet cell and incretin function is enhanced in response to oral, but not intravenous, stimulation - i.e. incretin released from the gut in response to oral stimulation play a key role for the enhanced islet function after gastric bypass surgery.

Inclusion Criteria:

• Participation in previous study (NCT01559779)

Exclusion Criteria:

• Pregnancy/lactation
• Major chronic disease develop since previous examination with possible impact on outcomes