Sleep Loss Linked to Gut Bacteria Changes, Worsening Colon Cancer

UF Health researchers find sleep deprivation alters microbiome, weakens immune system and chemotherapy response

Apr. 17, 2026 at 5:18am

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An ethereal, translucent X-ray image showing the intricate, ghostly structures of gut bacteria, conveying the complex interplay between sleep, the microbiome, and cancer progression.Cutting-edge research reveals how chronic sleep loss can disrupt the delicate balance of gut bacteria, with profound implications for cancer treatment and patient outcomes.San Diego Today

New research from the UF Health Cancer Institute has found that chronic sleep loss can disrupt the gut microbiome, leading to changes in the immune system that promote cancer progression and reduce the effectiveness of chemotherapy. The study, presented at the American Association for Cancer Research Annual Meeting, used mouse models to show how sleep deprivation alters the composition and behavior of gut bacteria, with functional effects on both cancer growth and cancer treatment response.

Why it matters

This study highlights the critical, interconnected relationship between sleep, gut health, and cancer outcomes. It underscores the importance of addressing sleep deprivation, which is common among cancer patients, as part of a holistic approach to patient care. The findings also open up new avenues for researchers to develop therapies that can rebalance the microbiome and potentially improve treatment response for cancer patients struggling with sleep issues.

The details

The researchers used mouse models to mimic the effects of long-term sleep deprivation in humans. They collected stool samples from sleep-deprived mice and transplanted them into healthy mice, allowing them to isolate the role of the microbiome. They found that sleep-deprived mice not only had worse cancer progression, but the chemotherapy drug 5-FU was less effective and the abundance of immune cells involved in fighting tumors was reduced. Genes regulating circadian rhythm were also affected. The team believes sleep deprivation is altering the composition and behavior of gut bacteria in ways that impact both cancer growth and treatment response.

  • The study was presented on April 20, 2026 at the American Association for Cancer Research Annual Meeting in San Diego.
  • The research was conducted by the UF Health Cancer Institute over an unspecified period of time prior to the conference presentation.

The players

Maria Hernandez

A graduate student in the lab of Christian Jobin, Ph.D., who presented the study findings.

Christian Jobin, Ph.D.

The Gatorade Distinguished Professor of Medicine in the UF College of Medicine and co-leader of the UF Health Cancer Institute's Immuno-Oncology and Microbiology research program.

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What they’re saying

“Sleep deprivation is very common among patients with cancer, but it's often overlooked in patient care, and molecular evidence linking it to disease outcomes was lacking.”

— Maria Hernandez, Graduate student

“This study highlights the importance of maintaining a healthy microbiome by getting good sleep and eating a healthy diet. Our finding is huge because it emphasizes the need to evaluate the patient as a whole and identify how we can better support these systems to improve patient outcomes.”

— Maria Hernandez, Graduate student

“We know so much about the microbiome that we need to start taking care of it, treat it with respect. Like your mom used to say, sleep is important, eat well. We understand this holistically, but now we know it may be going through the microbiome. It could be something that's in tune with your lifestyle.”

— Christian Jobin, Ph.D., Gatorade Distinguished Professor of Medicine

What’s next

The team is working to identify the specific mechanism and molecule involved in how sleep deprivation alters the gut microbiome to promote cancer progression and reduce chemotherapy effectiveness. Long-term, the findings could lead to new therapies that can rebalance the microbiome and improve outcomes for cancer patients struggling with sleep issues.

The takeaway

This study underscores the critical, bidirectional relationship between sleep, gut health, and cancer outcomes. It highlights the need for a more holistic approach to cancer care that addresses lifestyle factors like sleep in addition to medical treatments. By better understanding how the microbiome responds to sleep deprivation, researchers may be able to develop new ways to support this system and improve patient prognosis.