The role of physical exercise and diet in the treatment of non-alcoholic fatty liver disease.

Non-alcoholic fatty liver disease (NAFLD) is characterized by an accumulation of hepatic fat, diagnosed histologically or radiologically (ultrasound), in the absence of a secondary cause of steatosis, especially alcohol consumption. Its prevalence is estimated to be approximately 25%. This high prevalence is correlated with the risk factors attributed to the metabolic syndrome. Non-alcoholic steatohepatitis (NASH) is a progressive form of NAFL and it can lead to end-stage liver disease in some patients. Once diagnosed, lifestyle changes must be initiated to lower hepatic fat accumulations in the liver. Physical exercise and diet play the most important role in achieving the desired weight loss goal.