GIP and type 2 diabetes mellitus: Subsequent correlation analysis revealed a significant association between postprandial SCGN and GIP levels in healthy individuals (R = 0.507; P < .01) (Fig. 1F), which is consistent with findings in patients with type 2 diabetes, showing correlations in both fasting (R = 0.291; P = .019) (Fig. 1G) and postprandial (R = 0.749; P < .001) (Fig. 1H) measurements.