Non-alcoholic fatty liver disease (NAFLD), as its name indicated, is a condition caused by abnormal or excessive fat buildup in liver , which is not a result of heavy alcohol use. It has become a common chronic liver disease and is affecting up to 25% of people worldwide. Most people have no symptoms, and 2% to 5% of people will experience complications from the fat in their liver and a more serious condition named non-alcoholic steatohepatitis (NASH) due to liver inflammation and cell damage, which ultimately could develop into liver cirrhosis. Thus, early detection is important before some irreversible results in the liver disease progression pose clinical and economic burdens. Evidence shows that changes in immune cells in the liver are related to the development of NAFLD. And the presence of chronic low-grade inflammation characterized by immune cell activation, abnormal cytokine production, and increased acute phase proteins is a hallmark of NAFLD. ...