Siessmeier, T, Nix, W A, Hardt, J et al. · Journal of neurology, neurosurgery, and psychiatry · 2003 · DOI
Researchers used a brain imaging technique called PET scans to measure how much glucose (energy) different parts of the brain were using in ME/CFS patients compared to healthy controls. About half of the ME/CFS patients showed reduced brain activity in specific areas involved in emotion and self-awareness, while the other half had normal scans. The study suggests ME/CFS may affect the brain differently in different people.
This study provides objective neurobiological evidence that brain metabolism changes may occur in a subset of ME/CFS patients, potentially validating patient experiences of cognitive difficulties and emotional disruption. Identifying metabolic subtypes could eventually help clinicians stratify patients and tailor treatments based on individual neurobiological profiles rather than treating all ME/CFS patients identically.
This study does not prove that brain hypometabolism causes ME/CFS symptoms, nor does it establish a universal biomarker for the disease—half of patients showed no metabolic abnormalities. The correlations between metabolism and anxiety/depression do not clarify whether these are primary drivers or secondary consequences of illness. Cross-sectional design prevents determination of whether metabolic changes precede, accompany, or result from disease onset.
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
Siessmeier, T, Nix, W A, Hardt, J, Schreckenberger, M, Egle, U T, & Bartenstein, P (2003). Observer independent analysis of cerebral glucose metabolism in patients with chronic fatigue syndrome.. Journal of neurology, neurosurgery, and psychiatry. https://doi.org/10.1136/jnnp.74.7.922
BibTeX
@article{mecfsatlas-siessmeier-2003-observer-independent,
author = {Siessmeier, T and Nix, W A and Hardt, J and Schreckenberger, M and Egle, U T and Bartenstein, P},
title = {Observer independent analysis of cerebral glucose metabolism in patients with chronic fatigue syndrome.},
journal = {Journal of neurology, neurosurgery, and psychiatry},
year = {2003},
doi = {10.1136/jnnp.74.7.922},
note = {PubMed: 12810781},
url = {https://www.mecfsatlas.com/evidence/siessmeier-2003-observer-independent},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/siessmeier-2003-observer-independent
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