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HEALTH

The Claim

About one-third of Americans have excess liver fat.

Verified by Lenz ·

The Short Version

The broad takeaway is supported: recent U.S. evidence commonly places fatty liver in roughly 30% of adults, making “about one-third” a reasonable shorthand. The strongest support comes from national survey analyses and review articles showing prevalence near that level. The claim is not fully precise because estimates vary by definition and testing method, and many studies measure adults rather than all Americans.

Caveats

  • Most supporting studies estimate prevalence in U.S. adults, not the entire population including children.
  • “Excess liver fat” is not a single standardized measure; prevalence changes depending on whether the study uses NAFLD, MAFLD/MASLD, imaging, or biomarker definitions.
  • Reported U.S. prevalence ranges from roughly 20% in older datasets to above 35% in some newer definitions, so “one-third” is an approximation, not a fixed rate.

The Receipts

  1. Prevalence of Nonalcoholic Fatty Liver Disease in the United States: The Third National Health and Nutrition Examination Survey, 1988–1994

    National Institutes of Health / PMC

  2. Prevalence of NAFLD and NASH among adults in the United States, 1988–2016

    JAMA Network Open

  3. Understanding the Burden of Nonalcoholic Fatty Liver Disease

    PMC

  4. Prevalence of Nonalcoholic Fatty Liver Disease in the United States

    PubMed Central (Hepatology)

  5. Association Between Magnetic Resonance Imaging–Proton Density Fat Fraction and Liver Histology Features in Patients With Nonalcoholic Fatty Liver Disease or Nonalcoholic Steatohepatitis

    Gastroenterology (AGA / Elsevier)

  6. FastStats - Chronic Liver Disease or Cirrhosis

    CDC

  7. Prevalence of Nonalcoholic Steatohepatitis and Associated Fibrosis Stages Among US Adults Using Imaging-Based vs Biomarker-Based Noninvasive Tests

    Journal of Health Economics and Outcomes Research

  8. Understanding the Burden of Nonalcoholic Fatty Liver Disease

    Diabetes Spectrum

  9. Overall and subgroup prevalence of non-alcoholic fatty liver disease ...

    ScienceDirect

  10. Global incidence and prevalence of nonalcoholic fatty liver disease

    PMC

+ 16 more sources — see the full list on Lenz

Filed Under

Americans

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