NAFLD is non-alcoholic fatty liver disease that is not caused by alcohol, with little to no inflammation. Nearly 100 million Americans have NAFLD. Of those, up to 25 million have NASH. NASH stands for non-alcoholic steatohepatitis and occurs when the liver swells and there is damage to liver cells. As the disease progresses and scar tissue impairs the liver’s ability to function cirrhosis can occure.