Prohost Letter #459 ~ NAFLD & NASH NAFLD is Non-Alcoholic Fatty Liver Disease, and NASH is Non-Alcoholic Steatohepatitis. We will start with NAFLD.   NAFLD The Non-Alcoholic Fatty Liver Disease is caused by excessive fat building up inside the liver cells. It is obvious that what is called Non-Alcoholic fatty liver disease is not caused by alcohol. The liver disease caused by Alcohol is called …