GIP and type 2 diabetes mellitus: At the same time, GIP and oxyntomodulin displayed only a baseline difference between NGT and T2DM groups (the baseline GIP is higher (p = 0.028) and the baseline oxyntomodulin is lower (p = 0.033) in the T2DM group, Table 1 and Supplementary Figure 1), whereas other timepoints were not significantly different.