The liver enzymes alanine and aspartate aminotransferase (ALT and AST), γ-glutamyltransferase (GGT), and alkaline phosphatase (ALP) have been widely used as good markers of liver health, and some epidemiological studies have demonstrated an association of ALT and GGT with metabolic syndrome, CVD, and type 2 diabetes [3]. This evidence concerns the gene GPT and type 2 diabetes mellitus.