GPT and metabolic dysfunction-associated steatotic liver disease: Of the 630 patients with NAFLD who underwent MRI-PDFF, the group with abnormal levels of both ALT and GGT presented a significantly higher liver fat content (%) than the other three groups (median 15.2 vs. 15.5 vs. 8.3 vs. 9.4, P < 0.001, Table 1).