INS and type 2 diabetes mellitus: Fasting serum insulin levels were higher in T2D compared to Control, and this increase was not prevented by either LD or HD Enalapril treatment (1.8 ± 0.1 vs. 2.5 ± 0.5, 3.2 ± 1.4 and 2.9 ± 1.2 ng/mL, respectively; p < 0.05).