GPT and fatty liver disease: Biochemical examination shows that AST, ALT and GGT levels are used to signify hepatic inflammation and AST/ALT denotes an alcoholic etiology in fatty liver.14 Furthermore, previous study signifies that highest or lowest AST/ALT quartile within their respective normal ranges were used as surrogate biomarkers for T2DM.But, in this study only ALT enzyme was significantly higher in Type 2 diabetic subjects of age greater than 35 years.