Morris, Gerwyn, Maes, Michael, Berk, Michael et al. · Metabolic brain disease · 2019 · DOI
This study proposes a theory for how ME/CFS might develop, starting with an infection that triggers lasting problems in the body's immune system and stress response. The authors suggest that in genetically vulnerable people, this leads to a chain of events: increased inflammation, intestinal problems that allow bacteria-related substances to enter the bloodstream, nervous system dysfunction, and eventually a state where the immune system becomes exhausted and less able to fight back. This model tries to explain why ME/CFS patients have the specific symptoms and lab abnormalities doctors observe.
Understanding how ME/CFS develops is essential for identifying potential treatment targets and biomarkers. This comprehensive mechanistic model connects multiple known abnormalities in ME/CFS patients into a coherent biological narrative, providing a testable framework that could guide future research into prevention and therapeutic interventions. For patients, a validated disease mechanism could improve medical recognition and lead to more effective treatments.
This is a theoretical model based on integrating existing literature rather than new experimental data, so it does not definitively prove the proposed sequence of events occurs in ME/CFS patients. The model does not establish causation for individual mechanisms and cannot prove that endotoxin tolerance is the primary driver of ME/CFS rather than a secondary consequence. Validation would require prospective clinical studies tracking patients at each proposed disease stage.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Morris, Gerwyn, Maes, Michael, Berk, Michael, & Puri, Basant K (2019). Myalgic encephalomyelitis or chronic fatigue syndrome: how could the illness develop?. Metabolic brain disease. https://doi.org/10.1007/s11011-019-0388-6
BibTeX
@article{mecfsatlas-morris-2019-myalgic-encephalomyelitis-2,
author = {Morris, Gerwyn and Maes, Michael and Berk, Michael and Puri, Basant K},
title = {Myalgic encephalomyelitis or chronic fatigue syndrome: how could the illness develop?},
journal = {Metabolic brain disease},
year = {2019},
doi = {10.1007/s11011-019-0388-6},
note = {PubMed: 30758706},
url = {https://www.mecfsatlas.com/evidence/morris-2019-myalgic-encephalomyelitis-2},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/morris-2019-myalgic-encephalomyelitis-2
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