Nonalcoholic fatty liver disease.

Area of Science:

• Hepatology
• Gastroenterology
• Internal Medicine

Background:

• Nonalcoholic fatty liver disease (NAFLD) is a spectrum of liver conditions, ranging from simple steatosis to advanced fibrosis and end-stage liver disease.
• Historically described in specific demographics, NAFLD now affects diverse populations, including lean individuals and children.
• It is increasingly recognized as the most common cause of elevated liver enzymes in the United States.

Purpose of the Study:

• To define the clinicopathologic spectrum of nonalcoholic fatty liver disease (NAFLD).
• To clarify the terminology and diagnostic criteria for nonalcoholic steatohepatitis (NASH) within the broader NAFLD spectrum.
• To highlight the growing prevalence and potential etiologies of NAFLD.

Main Methods:

• Review of existing literature and clinical descriptions of NAFLD and NASH.
• Analysis of historical and contemporary understanding of the disease's presentation and pathology.
• Discussion of proposed etiological factors, including insulin resistance and oxidative stress.

Main Results:

• NAFLD encompasses a range of conditions from steatosis to cirrhosis.
• Nonalcoholic steatohepatitis (NASH) specifically refers to cases with steatohepatitis and fibrosis.
• The condition is associated with insulin resistance and oxidative stress, though its exact etiology is not fully understood.

Conclusions:

• NAFLD is a prevalent condition with a wide clinical and pathological spectrum.
• Current management primarily focuses on lifestyle modifications, particularly weight loss.
• Further research into the etiology and targeted therapies for NAFLD is warranted.