Metabolic features of chronic fatigue syndrome
Robert K. Naviaux, Jane C. Naviaux, Kefeng Li et al. · Proceedings of the National Academy of Sciences (PNAS) · 2016 · DOI
Quick Summary
This study analyzed blood metabolites from 84 ME/CFS patients and 45 healthy controls using untargeted metabolomics. Researchers found 80% of the abnormal metabolites were decreased in ME/CFS patients, suggesting a hypometabolic state — the body running in energy conservation mode. The pattern resembled a 'dauer-like' state seen in organisms under stress.
Why It Matters
This was one of the first large-scale metabolomics studies in ME/CFS to find consistent, systemic changes across multiple biochemical pathways. It provided objective biological evidence of metabolic dysfunction and challenged psychological explanations of the illness.
What This Study Does Not Prove
This study cannot establish whether metabolic changes are a cause or consequence of ME/CFS. The hypometabolic state could be secondary to inactivity, disrupted sleep, or other features of illness.
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Metadata
- DOI
- 10.1073/pnas.1607571113
- Case definition
- Canadian Consensus Criteria (CCC)
- Sample size
- 84 patients
- Control group
- Yes
- Review status
- Editor reviewed
- Evidence level
- Replicated human evidence from multiple independent studies
- Last updated
- 7 April 2026