Non-invasive Tests for Non-alcoholic Steato-hepatitis

Inclusion Criteria: * Policlinico Universitario Agostino Gemelli IRCCS: Subjects with NASH documented by liver biopsy or fibroscan and no evidence of another form of liver disease with a BMI ≥ 30 and ≤40 kg/m2. Age 25-65 years. * Coorte Azienda Ospedaliera Mater Domini: subjects with NASH documented by liver fibroscan aged \>40 years with one or more cardiovascular risk factors,including overweight/obesity, elevated blood pressure, dyslipidemia, and dysglycemia * Azienda Ospedaliero-Universitaria Policlinico Federico II: Subjects with NASH documented by fibroscan and no evidence of another form of liver disease. Age 25-65 years. Exclusion Criteria: * All units: Coronary event or procedure (myocardial infarction, unstable angina, coronary artery bypass, surgery or coronary angioplasty) in the previous 6 months; Liver cirrhosis; End stage renal failure; Participation in any other concurrent therapeutic clinical trial; Any other life-threatening, non-cardiac disease; Pregnancy; Inability to give informed consent; Substantial alcohol consumption (\>20 g/day for women or \>30 g/day for men); Wilson's disease; Lipodystrophy; Parenteral nutrition; Abetalipoproteinemia; Interfering medications (e.g., amiodarone, methotrexate, tamoxifen, corticosteroids).