GGT1 and metabolic syndrome: Fatty liver, dyslipidemia, ever-smoking, drinking, the ALDH2*2 allele and the BMI, transaminase, HbA1c, BP and triglyceride values were significantly associated with the GGT levels, irrespective of the GGT1 genotype, while the fasting plasma glucose, HDL-C and LDL-C levels were significantly associated with the GGT levels only in G allele carriers.