Fatty liver is defined as a percentage of fatty degenerated hepatocytes exceeding 5% of total hepatocytes that can be seen under light microscopy, currently extended to fat deposition in the liver exceeding 5% of the liver weight. Non-alcoholic fatty liver disease is defined as a disease that manifests as simple hepatic steatosis to non-alcoholic steatohepatitis in people who hardly drink alcohol, except for viral hepatitis, autoimmune liver disease and hereditary liver disease, and some patients can eventually progress to cirrhosis characterized by broad spectrum fatty liver disease. The diagnostic criteria for nonalcoholic steatohepatitis require three necessary conditions to be met, such as imaging or histological steatosis of hepatocytes, as well as the exclusion of excessive alcohol consumption within the last year, such as ≥140 g per week for men and ≥70 g per week for women. in addition, there is no comorbidity with other chronic liver diseases or other systemic diseases that can cause hepatic steatosis.”