Abstract
The role of insulin in controlling gastric inhibitory polypeptide (GIP) release was assessed in seven totally pancreatectomized patients, in whom inhibitory effects of endogenous pancreatic hormones on GIP secretion were excluded. In these patients, glucose was ingested on two occasions, once alone and once during insulin infusion using an artificial endocrine pancreas to maintain blood glucose at levels similar to those in normal subjects. Plasma levels of GIP, the maximum response of plasma GIP, and the integrated incremental GIP for 180 min were similar. We conclude that insulin does not alter the secretion of GIP in response to oral glucose when the influence of endogenous pancreatic hormones is excluded.
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