BDNF and type 2 diabetes mellitus: The serum BDNF levels showed a positive correlation with HOMA-IR (r = 0.28; P < 0.05), the triglyceride level (r = 0.265; P < 0.05), and the WBC level (r = 0.35; P < 0.001) in T2DM as shown in Table 2.