Inclusion Criteria:  Alanine aminotransferase (ALT) >1.5 times the greater normal value with or without elevated γ-glutamyl transpeptidase (γGT) Hepatic steatosis-indicating findings on ultrasound and / or liver biopsy BMI 20-40 Kg/m2  Exclusion Criteria:  Alcohol consumption > 210 or > 140 grams per week for men or women, respectively Use of a potentially hepatotoxic drug Detection of hepatitis B virus (HBsAg) surface antigen or Hepatitis C virus antibodies (anti-HCV) or HIV antibodies The coexistence of α systemic disease with potentially hepatic involvement