GCG and type 1 diabetes mellitus: Moreover, the consumption of these foods has been reported to improve the gut barrier function264,265 as well as postprandial glucose metabolism and insulin sensitivity.266 Other studies found that patients receiving a diet with a high content of fiber showed augmented levels of SCFA-producing bacteria, reduced glycated hemoglobin (HbA1c), and increased GLP-1 levels.267,268 A recent study showed that supplementing NOD mice with extra virgin olive oil resulted in reduced insulitis and delayed T1D onset.