Risk factors and mechanisms of non-alcoholic steatohepatitis.

The worldwide proportion of overweight and obese individuals has increased yearly for more than a decade. Along with rates of obesity, the incidence of co-morbid conditions such as type 2 diabetes, cardiovascular disease and liver disease has also increased. The form of liver disease associated with obesity is termed non-alcoholic steatohepatitis (NASH) due to the histological similarities to livers of chronic alcoholics. NASH has been observed in adult as well as pediatric populations; however, the etiology of this disease is still unknown. This review outlines some of the risk factors commonly associated with NASH and describes molecular mechanisms proposed to underlie disease pathogenesis.