The effect of insulin-induced hypoglycemia with and without atropine on plasma GIP in man

Insulin-induced hypoglycemia caused a modest but significant (p = 0.031) increase in plasma GIP. This increase was significantly (p = 0.031) attenuated when atropine was given together with insulin, indicating that the vagal nerves play a major role in the release of plasma GIP during hypoglycemia.