There is a growing interest in nonalcoholic steatohepatitis (NASH), a disease entity which is quite similar to alcoholic liver disease.We present three patients with nonalcoholic steatohepatitis, and review current opinion on this disease entity.Non-alcoholic steatohepatitis is very often associated with the insulin resistance syndrome. There is also an association with hepatic iron overload. In one of our patients, biochemical improvement occurred after treatment with phlebotomy. Insulin resistance, resulting in fat accumulation, seems to be an important first step in the pathogenesis. Free fatty acids, iron, and other sources of oxidative stress probably result in cell damage. In some patients, these events result in necroinflammation mediated by various cytokines and immunoactive cells. The prognosis in pure steatosis is usually good. Presence of necroinflammation or fibrosis indicates a risk of progressive liver disease, including cirrhosis.