NAFLD to NASH Progression and Environmental Factors
Non-alcoholic steatohepatitis (NASH) represents progressive liver inflammation beyond simple fatty liver (NAFLD), with risk of progression to cirrhosis and hepatocellular carcinoma. Environmental chemical exposures accelerate NAFLD-to-NASH transition.
PFAS Mechanisms of Hepatic Injury
PFAS activate hepatic stellate cells—the drivers of liver fibrosis—through TGF-beta signaling pathways. PFAS also disrupt hepatic lipid metabolism beyond fat accumulation, promoting oxidative stress and inflammatory cytokine production that characterize NASH.
Biomarker and Imaging Evidence
Cross-sectional studies show higher PFAS serum levels correlate with elevated ALT, AST, and liver stiffness measurements (indicative of fibrosis) independent of BMI and alcohol use. Liver biopsy studies confirm PFAS association with NASH histological features.
Clinical Monitoring and Intervention
Hepatologists managing NAFLD/NASH patients should assess environmental exposures including PFAS. Exposure reduction combined with standard NASH management—weight loss, exercise, metabolic control—may slow fibrosis progression in chemically exposed patients.