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Human behavior is intricately shaped by social influences that arise from interactions with others in diverse contexts. These influences not only mold beliefs and attitudes but also drive the regulation of behaviors through both direct communication and observational learning. The study of these processes falls within the domain of social psychology, which seeks to understand how individuals are affected by and affect those around them.Mechanisms of Social InfluenceDirect social influence...
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NASH in Lean Individuals.

Ramy Younes1, Elisabetta Bugianesi1

  • 1Department of Medical Sciences, Division of Gastroenterology, University of Torino, AOU Città della Salute e della Scienza, Torino, Italy.

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Summary
This summary is machine-generated.

Nonalcoholic fatty liver disease (NAFLD) can affect lean individuals, not just those who are obese. Understanding the unique mechanisms and clinical course of lean NAFLD is crucial for accurate diagnosis and management.

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Area of Science:

  • Hepatology
  • Metabolic Disorders
  • Gastroenterology

Background:

  • Nonalcoholic fatty liver disease (NAFLD) is typically linked to obesity but also affects lean individuals (BMI <25 kg/m² Caucasians, <23 kg/m² Asians).
  • This 'lean' NAFLD phenotype occurs globally, including 10-20% of nonobese Western populations.
  • Mechanisms for lean NAFLD are unclear, potentially involving dysfunctional fat, altered body composition, genetics (e.g., PNPLA3 polymorphisms), epigenetics, and gut microbiota.

Purpose of the Study:

  • To review current knowledge on NAFLD in lean individuals.
  • To highlight unanswered questions and research gaps in lean NAFLD.

Main Methods:

  • Literature review of studies on lean NAFLD.
  • Analysis of pathophysiological mechanisms, clinical presentation, and disease spectrum.

Main Results:

  • Lean NAFLD patients exhibit milder metabolic syndrome features than obese counterparts but higher rates of dyslipidemia, hypertension, insulin resistance, and diabetes compared to lean controls.
  • Histological severity data are mixed, but lean NAFLD can progress to nonalcoholic steatohepatitis (NASH).
  • Contrary to belief, lean NAFLD may not follow a benign clinical course.

Conclusions:

  • Lean NAFLD presents unique pathophysiological challenges and requires further investigation.
  • The clinical course and long-term outcomes of lean NAFLD challenge assumptions of benignity.
  • More research is needed to address knowledge gaps in lean NAFLD.