GPT and metabolic syndrome: To present, plasma level of liver enzymes, including Alanine transaminase (ALT) and Aspartate aminotransferase (AST), commonly used as the indicators of liver damage, and Gamma-Glutamyl Transpeptidase (GGT), a biomarker for oxidative stress associated with glutathione regulation, and alkaline phosphatase (ALP), were widely explored as the indicators of MetS and its components among different populations [14–25].