The Study
Decrease in Sleep Duration and Poor Sleep Quality over Time Is Associated with an Increased Risk of Incident Non-Alcoholic Fatty Liver Disease
This study watched a bunch of people over time and noticed that those whose sleep got worse were more likely to develop a liver condition called NAFLD. But it didn’t make anyone change their sleep — it just watched what happened, so we can’t say sleep changes caused the liver problem.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
This study looked at how changes in how much and how well people sleep affect their chance of getting fatty liver disease.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 567 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — even if you don’t gain weight, sleeping less or worse may still raise your risk of liver damage, making good sleep a simple way to protect your liver.
- 2People who slept more than one hour less per night over a few years had a 24% higher chance of getting fatty liver disease, and a 58% higher chance of getting a more serious form.
- 3People with consistently bad sleep had a 13% higher chance of fatty liver.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of Personalized Medicine
Year
2022
Authors
Y. Um, Yoosoo Chang, Hyun-Suk Jung, I. Cho, Jun-ho Shin, Hocheol Shin, S. Wild, C. Byrne, S. Ryu
Related Content
Claims (6)
People who sleep more than one hour less per night than usual for several years have a higher likelihood of developing a form of liver disease with significant scarring, as measured by standard blood tests.
People who sleep less have a higher rate of developing non-alcoholic fatty liver disease, even when their body weight is taken into account.
Adults who consistently sleep more than one hour less per night over several years have a 24% higher incidence of non-alcoholic fatty liver disease compared to those who do not reduce their sleep, even when accounting for changes in body weight.
Adults with consistently poor sleep quality, as measured by a standardized sleep questionnaire, have a 13% higher incidence of non-alcoholic fatty liver disease compared to those with better sleep quality, even when accounting for how long they sleep and their body weight.
People with consistently poor sleep have a 13% higher chance of developing non-alcoholic fatty liver disease, but their risk of liver scarring does not increase compared to those with better sleep.
People with better sleep quality have a 29% lower risk of developing non-alcoholic fatty liver disease.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.