GPT and metabolic dysfunction-associated steatohepatitis: In fact, aspartate aminotransferase (AST) and alanine aminotransferase (ALT), gamma-glutamyltransferase (GGT) and alkaline phosphatase concentrations were significantly lower in treated patients compared to the basal conditions (p<0.05); whereas, after diet, NAFLD/NASH patients showed a significant statistical reduction only for GGT serum levels (p<0.05).