As seen in Table 2, the results showed that fasting PP was positively correlated with the course of diabetes and AUCbg (r = 0.256, r = 0.243, r = 0.257, p < 0.05), and was negatively correlated with 60 min postprandial C‐P, 60 min postprandial insulin, and fasting GLP‐1 (r = −0.248, r = −0.235, r = −0.207, p < 0.05). This evidence concerns the gene GCG and diabetes mellitus.