Bested, A C, Saunders, P R, Logan, A C · Medical hypotheses · 2001 · DOI
This study proposes that ME/CFS symptoms may be caused by a breakdown in the blood-brain barrier (BBB), a protective layer that normally keeps harmful substances out of the brain. The researchers reviewed scientific literature to identify factors that could damage this barrier in ME/CFS patients, including viral infections, stress, and certain chemical imbalances. They suggest that if this protective barrier becomes leaky, it could allow harmful substances into the brain and disrupt normal nerve function, potentially explaining many ME/CFS symptoms.
Understanding potential mechanisms of ME/CFS is crucial for developing targeted treatments. If BBB dysfunction contributes to ME/CFS, it could explain why neurological symptoms occur and suggest therapeutic strategies to restore barrier integrity. This hypothesis-generating work helped redirect research attention toward CNS involvement and neuro-inflammatory mechanisms in ME/CFS.
This study does not provide direct evidence that BBB permeability is actually increased in ME/CFS patients—it is a theoretical review identifying candidate mechanisms. It does not establish causation, only proposes a plausible pathway. The study does not rule out alternative mechanisms or prove that treating BBB permeability would improve ME/CFS symptoms.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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