Effect of HFD (A and B); STZ (C and D); herbal combination and Trigonella foenum graceum extracts (E and F) on blood glucose levels of diabetic control, test and normal groups. HFD was given for six months, while STZ, the herbal combination and Trigonella foenum graceum extract for one month. Analysis was done by Student’s t-test using Sigma plot software. Data are presented as means ± SEM and level of significance is p < 0.05 (where * = p < 0.05; ** = p < 0.01 and *** = p < 0.001; n = 6).