When sleep apnea throws metabolism out of sync

By Elodie Vaz | Published on March 6, 2026 | 3 min read


Sleep apnea affects nearly one billion people worldwide. This condition is characterized by repeated interruptions of breathing during the night, leading to episodes of intermittent hypoxia. While the cardiovascular and metabolic consequences of this respiratory stress are well documented, its impact on the temporal organization of biological functions has remained largely unexplored.  

A study published on February 25 in Science Advances by researchers from Université Grenoble Alpes, Inserm, and Grenoble Alpes University Hospital highlights a previously underappreciated dimension of the disease: intermittent hypoxia profoundly reorganizes the liver’s biological clock and alters the daily rhythms of its metabolic activity.  

An underexplored perspective  

“While the pathological consequences of intermittent hypoxia in sleep apnea are well documented, their impact on the body’s biological rhythms, governed by the circadian clock, remains insufficiently explored,” the authors stated in a press release. The aim of the study was precisely to assess how this chronic respiratory stress influences the circadian organization of a key organ in energy metabolism: the liver.  

As a central hub for the regulation of glucose, lipids, and numerous biochemical pathways, the liver exhibits strong 24-hour rhythmicity. Any disruption of this temporal orchestration is likely to have systemic repercussions.  

A multi-omics approach across the full day–night cycle  

The researchers used a murine model of chronic intermittent hypoxia to replicate conditions observed in patients with sleep apnea. The originality of the protocol lies in the systematic analysis of the effects of this stressor across the entire nychthemeral cycle.  

Focusing on the liver, the teams combined transcriptomic, metabolomic, and physiological approaches. This integrative strategy aimed to monitor, hour by hour, adaptations in hepatic metabolic activity and to characterize potential rhythm reprogramming induced by hypoxia.  

Profound circadian reprogramming  

The results show that intermittent hypoxia does not merely alter major energy pathways orchestrated by the liver, such as glucose and lipid metabolism. It “profoundly reprograms their circadian organization.”  

Metabolomic analysis revealed that nearly half of hepatic metabolites display a 24-hour rhythm. Even more strikingly, more than one third of them acquire a new rhythm under intermittent hypoxia. This redistribution of metabolic rhythms throughout the day reflects genuine temporal reprogramming of hepatic activity.  

Thus, beyond the quantitative alterations classically described, the study highlights shifts in the phases of metabolic expression and activity. This temporal dimension, previously underestimated in sleep apnea, appears to be a major determinant of the metabolic disturbances associated with the disease.  

Toward chronomedicine in sleep apnea?  

These findings open important perspectives in chronomedicine. By reshaping hepatic metabolic rhythms, intermittent hypoxia may modify the body’s response to certain treatments, particularly those targeting glycemia or lipid metabolism.  

The effectiveness of these medications could therefore vary depending on the time of administration, with optimal windows potentially differing from those observed in non-apneic individuals. In other words, the desynchronization induced by sleep apnea may require a reassessment of therapeutic strategies that integrate circadian timing.  

By demonstrating that intermittent hypoxia acts as a genuine temporal reprogrammer of hepatic metabolism, this study calls for moving beyond a strictly structural or functional view of the disease. It paves the way for research aimed at determining whether correcting sleep apnea—or adjusting treatments according to chronobiological principles—can restore a more favorable circadian organization and improve metabolic management in these patients.                 

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About the Author – Elodie Vaz
Health journalist, CFPJ graduate (2023).
Élodie explores the marks diseases leave on bodies and, more broadly, on human life. A registered nurse since 2010, she spent twelve years at patients’ bedsides before exchanging her stethoscope for a notebook. She now investigates the links between environment and health, convinced that the vitality of life cannot be reduced to that of humans alone.