Sleep Patterns and Non-Alcoholic Fatty Liver Disease

Non-alcoholic fatty liver disease (NAFLD) encompasses a spectrum of hepatic steatosis not driven by excess alcohol intake, rising in prevalence alongside obesity and metabolic syndrome. Variations in sleep duration, timing, quality and disorders such as insomnia and obstructive sleep apnoea appear to influence both the onset and progression of NAFLD. Disrupted circadian rhythms can impair lipid metabolism and insulin sensitivity, while poor sleep hygiene and misaligned feeding times exacerbate inflammatory pathways and oxidative stress in hepatocytes. Conversely, hepatic dysfunction may feed back to alter sleep architecture, creating a vicious cycle. Clarifying these interactions is critical given the global burden of NAFLD and the potential to integrate sleep-focused interventions into lifestyle-based management and prevention strategies.

Research from Nature Portfolio

A comprehensive systematic review and meta-analysis synthesised data from multiple cohort and case-control studies examining sleep duration and fatty liver disease risk. Short or long sleep duration showed no consistent association with fatty liver onset, with pooled estimates indicating non-significant effect sizes for both extremes of sleep length. Significant heterogeneity among study designs, exposures and outcome measures was noted, underscoring the need for standardised sleep assessments and prospective follow-up in future investigations. This work highlights the current variability in evidence and calls for rigorous longitudinal research to resolve lingering uncertainties.

Sleep Patterns and Non-Alcoholic Fatty Liver Disease publication trend

The graph below shows the total number of articles in sleep patterns and non-alcoholic fatty liver disease across all publications each year (not limited to Nature Index journals).

Technical terms

Non-alcoholic fatty liver disease (NAFLD): A condition characterised by excess lipid accumulation in liver cells not attributable to significant alcohol use.

Hepatic steatosis: The accumulation of triglycerides within hepatocytes, representing the hallmark feature of fatty liver disease.

Insulin resistance: A reduced cellular response to insulin signalling, leading to impaired glucose uptake and dysregulated lipid metabolism.

Circadian rhythm: The endogenous, roughly 24-hour cycle governing physiological processes, including sleep–wake patterns and metabolic regulation.

Mendelian randomisation: A genetic epidemiology method using inherited variants as proxies for modifiable exposures to infer causal relationships from observational data.

References

1. Non-alcoholic Fatty Liver Disease: Growing Burden, Adverse Outcomes and Associations. Journal of Clinical and Translational Hepatology (2019).
2. Sleep Duration and the Risk of Fatty Liver Disease: A Systematic Review and Meta-analysis. Scientific Reports (2016).
3. Sleep Duration, Sleep Quality, and the Development of Nonalcoholic Fatty Liver Disease: A Cohort Study. Clinical and Translational Gastroenterology (2021).
4. Causal relationship between nonalcoholic fatty liver disease and different sleep traits: a bidirectional Mendelian randomized study. Frontiers in Endocrinology (2023).
5. Investigating the Association Between Seven Sleep Traits and Nonalcoholic Fatty Liver Disease: Observational and Mendelian Randomization Study. Frontiers in Genetics (2022).