The analysis of the correlation between the percentage of body weight loss in the T2DM group and baseline GLP-1 value showed a not significant negative correlation (linear coefficient: -0.44; p = 0.394), and in the non-T2DM group, a positive significant correlation was found (linear coefficient: 0.84; p = 0.031); furthermore, the correlation coefficient was 0.60. Here, GCG is linked to type 2 diabetes mellitus.