Characteristics of non-alcoholic steatohepatitis among lean patients in Japan: Not uncommon and not always benign

BACKGROUND AND AIM To elucidate features of nonobese non-alcoholic fatty liver disease (NAFLD), we assessed Japanese patients with NAFLD stratified by body mass index (BMI) and by sex. METHODS Biopsy-proven 762 NAFLD patients (404 men) were classified into three groups by the Japanese criteria: nonobese group (BMI