Nonalcoholic fatty liver disease (NAFLD): a comprehensive review.

Nonalcoholic fatty liver disease (NAFLD) is defined as fatty infiltration of the liver exceeding 5% to 10% by weight. It is a spectrum of disorders ranging from simple fatty liver (steatosis without liver injury), nonalcoholic steatohepatitis (steatosis with inflammation), and fibrosis/cirrhosis that resembles alcohol-induced liver disease but which develops in individuals who are not heavy drinkers. NAFLD is likely the most common cause of chronic liver disease in many countries.