People who have multiple autoantibodies targeting their pancreatic islets but still have normal blood sugar levels show a 45% decrease in the hormone response that helps regulate insulin after...

In people who have antibodies indicating early risk for type 1 diabetes but still have normal blood sugar, a decrease in the hormone GIP—compared to GLP-1—appears to be the main reason for reduced insulin response after eating, which may make GIP a better early indicator of pancreatic beta-cell stress.

People who have multiple autoantibodies related to type 1 diabetes but still have normal blood sugar levels show lower levels of the hormone GIP after consuming glucose, compared to those with only one such autoantibody. This difference may reflect an early disruption in the hormonal pathway that helps stimulate insulin release.

People who have multiple autoantibodies targeting their pancreatic islets, but still maintain normal blood sugar levels, show a smaller insulin response to oral glucose compared to intravenous glucose, suggesting an early alteration in how the gut and pancreas communicate.

People who have multiple antibodies targeting their insulin-producing cells but still have normal blood sugar tend to show lower levels of GLP-1 hormone during a glucose tolerance test than those with only one such antibody, though the difference is not large enough to be considered statistically reliable in this small group.

In female mice, removing the receptors for two gut hormones (GIP and GLP-1) causes blood sugar to rise abnormally after eating sugar, but not after injecting sugar directly into the bloodstream, showing that these hormones are required to regulate blood sugar after meals by helping the liver reduce glucose production.