<qa>  What is the presence of hepatic steatosis?- NAFLD is defined by the presence of hepatic steatosis ultrasound or retrospectively confirmed histologically without concomitant treatment responsible for steatosis corticosteroids, amiodarone, methotrexate, tamoxifen without risk drinking of alcoholic beverages 210 g week in men or 140 g week in women, and no other cause of chronic liver disease. 