ALDH2 and metabolic dysfunction-associated steatotic liver disease: The gamma-glutamyl transferase (GGT) level is recognized as a marker of not only excessive alcohol consumption or liver injury, but also oxidative stress,10 and it is a significant predictor for metabolic syndrome and NAFLD, independent of alcohol consumption.11, 12 In our recent study, the combination of a mildly elevated GGT value and harboring the ALDH2*2 allele was interactively associated with the incidence of diabetic retinopathy.13