GPT and diabetes mellitus: NAFLD - Non-Alcoholic Fatty Liver Disease, NASH - Non-Alcoholic Steatohepatitis, ROS - reactive oxygen species, TNF-α - tumor necrosis factor-alpha, TGF-β - transforming growth factor-beta, FLI - Fatty Liver Index, BARD - body mass index, aspartate transaminase/alanine transaminase ratio, and Diabetes Mellitus