Could Impaired Cerebrospinal Fluid Dynamics Be the Missing Link in Brain Disease—and ME/CFS?

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In 2022, I proposed that impaired cerebrospinal fluid (CSF) dynamics might play a central role in ME/CFS. At the time, this idea received little attention. Now, a major new study of more than 45,000 people highlights the importance of the choroid plexus—the brain tissue that produces CSF and regulates immune signaling—as an early predictor of cognitive decline and dementia.

The findings don't prove that impaired CSF dynamics cause disease, but they strengthen the case that the brain's fluid circulation and waste-clearance systems deserve far more attention. If the choroid plexus and CSF are compromised, the consequences may extend well beyond dementia and could have implications for other neurological conditions, including ME/CFS.

The researchers found that the choroid plexus (CP)—the tissue that produces cerebrospinal fluid and regulates immune signaling—is an early, measurable marker of brain aging and strongly predicts future cognitive decline and dementia. Changes in the choroid plexus can be detected years before dementia develops and are associated with widespread deterioration of brain structure.

The choroid plexus has traditionally received far less attention than neurons, yet it plays several essential roles:

  • Produces cerebrospinal fluid (CSF)
  • Regulates exchange between the blood and the brain
  • Helps remove waste products
  • Coordinates immune activity within the central nervous system

To reach these conclusions, the researchers analyzed MRI scans from 45,306 UK Biobank participants (average age 64) and followed cognitive performance and dementia over time.

Their main findings were striking:

  • A larger choroid plexus was associated with a significantly higher risk of developing dementia.
  • It was linked to widespread brain degeneration, including reduced gray matter, poorer white matter integrity, and MRI signs of accelerated brain aging.
  • Individuals with abnormal choroid plexus measurements experienced faster cognitive decline.

The study does not prove causation, but it supports the idea that dysfunction of the choroid plexus may contribute to neurodegeneration by impairing:

  • Cerebrospinal fluid production
  • Clearance of toxic proteins such as amyloid
  • Immune regulation
  • Inflammatory signaling
  • Overall brain homeostasis

Rather than being a passive bystander, the choroid plexus may actively participate in the disease process.

The implications are significant. The study shifts attention away from neurons alone and toward the brain's support systems. Because changes in the choroid plexus are detectable early on, MRI measurements of this tissue could become an early biomarker for dementia and perhaps even a future therapeutic target.

As I've mentioned before, if CSF is not flowing sufficiently, the brain is likely to be affected first and most profoundly. Impaired CSF circulation could reduce waste clearance, disrupt immune regulation, and alter the brain's internal environment. These mechanisms may be relevant not only to neurodegenerative diseases but also to conditions such as ME/CFS.

References:

The choroid plexus, cognitive decline, and incident dementia: insights from the UK Biobank
https://www.nature.com/articles/s41380-026-03739-5

Choroid plexus (Plexus Choroideus) - Human Anatomy | Kenhub
https://www.youtube.com/watch?v=jSta0wtQmho

or: 
https://www.kenhub.com/en/library/anatomy/choroid-plexus?utm_source=youtube&utm_medium=video&utm_campaign=choroid-plexus-plexus-choroideus&utm_content=comment

© 2000-2030 Sieglinde W. Alexander. All writings by Sieglinde W. Alexander have a fife year copy right.
Library of Congress Card Number: LCN 00-192742
ISBN: 0-9703195-0-9

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