脂肪肝是由多种疾病和病因引起的肝脏脂肪性变。所谓脂肪性变是指细胞浆内出现的脂肪滴超过了生理范围或者正常不出现脂滴的细胞中出现了脂滴。根据是否有过量酒精摄入,可将脂肪性肝炎分为酒精性脂肪性肝炎(ASH)和非酒精性脂肪性肝炎(NASH)。非酒精性脂肪性肝病(Non— Fatty liver is a fatty liver disease caused by a variety of diseases and causes. The so-called fatty change refers to the occurrence of lipid droplets within the cytoplasm over the physiological range or lipid droplets appear in the normal lipid droplets. According to whether there is excessive alcohol intake, steatohepatitis can be divided into alcoholic steatohepatitis (ASH) and non-alcoholic steatohepatitis (NASH). Non-alcoholic fatty liver disease (Non-