Non-alcoholic fatty liver disease (NAFLD) is the buildup of fat in the liver that is not caused by drinking too much alcohol. People who have it do not have a history of heavy drinking. NAFLD is closely related to being overweight.
Nonalcoholic Steatohepatitis (NASH) is a form of nonalcoholic fatty liver disease (NAFLD) in which you have hepatitis—inflammation of the liver—and liver cell damage, in addition to fat in your liver. Inflammation and liver cell damage can cause fibrosis, or scarring, of the liver