Interaction between sarcopenia and nonalcoholic fatty liver disease

Area of Science:

• Gerontology
• Hepatology
• Metabolic Diseases

Background:

• Sarcopenia (age-related muscle loss) and nonalcoholic fatty liver disease (NAFLD) are prevalent conditions, particularly in aging populations.
• Existing research indicates a significant association between sarcopenia and NAFLD, despite differing diagnostic criteria.

Purpose of the Study:

• To review the shared pathogenetic mechanisms linking sarcopenia and NAFLD.
• To explore the bidirectional relationship between these two conditions.

Main Methods:

• Literature review of cross-sectional and longitudinal studies.
• Analysis of shared etiological factors and pathophysiological pathways.

Main Results:

• Identified shared mechanisms including insulin resistance, hormonal imbalances, systemic inflammation, and dysregulation of myostatin and adiponectin.
• Highlighted nutritional deficiencies and physical inactivity as contributing factors.
• Acknowledged the bidirectional nature of the sarcopenia-NAFLD link.

Conclusions:

• Sarcopenia and NAFLD are interconnected through multiple common pathways, suggesting a complex interplay.
• Further research is needed to establish a direct causal relationship and clarify the role of sarcopenia in nonalcoholic steatohepatitis (NASH).