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Nonobese Fatty Liver Disease.

Donghee Kim1, W Ray Kim1

  • 1Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California.

Clinical Gastroenterology and Hepatology : the Official Clinical Practice Journal of the American Gastroenterological Association
|September 2, 2016
PubMed
Summary

Nonalcoholic fatty liver disease (NAFLD) affects both obese and nonobese individuals, often linked to metabolic issues. Lifestyle changes are key for managing this condition, especially in nonobese patients.

Keywords:
Body Mass IndexHepatic SteatosisLeanNonalcoholic Fatty Liver DiseaseNonalcoholic SteatohepatitisNonobeseNonoverweight

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Area of Science:

  • Hepatology
  • Metabolic Disorders
  • Gastroenterology

Background:

  • Nonalcoholic fatty liver disease (NAFLD) is hepatic steatosis without heavy alcohol use.
  • It commonly co-occurs with obesity and metabolic syndrome, but also affects nonobese individuals.
  • NAFLD prevalence varies by ethnicity, with higher recognition in Asians, even when controlling for obesity.

Purpose of the Study:

  • To review the characteristics and risk factors of NAFLD in nonobese individuals.
  • To compare NAFLD presentation and progression in obese versus nonobese patients.
  • To discuss the mortality impact and management strategies for nonobese NAFLD.

Main Methods:

  • Literature review of studies on NAFLD in nonobese populations.
  • Analysis of liver biopsy data comparing obese and nonobese NAFLD.
  • Examination of risk factors including visceral obesity, diet, and genetics.

Main Results:

  • NAFLD occurs in nonobese individuals across ethnicities, notably in Asians.
  • Nonalcoholic steatohepatitis and fibrosis prevalence are similar in obese and nonobese NAFLD patients.
  • Visceral obesity, high fructose/cholesterol intake, and genetic factors (e.g., PNPLA3) are linked to nonobese NAFLD.

Conclusions:

  • Nonobese NAFLD shares pathological similarities with obese NAFLD and may have significant mortality risks.
  • Identifying high-risk nonobese NAFLD patients and managing metabolic profiles is crucial.
  • Lifestyle modifications targeting visceral adiposity are the current standard of care for nonobese NAFLD.