E2 ModeratePreliminaryPEM unclearObservationalPeer-reviewedMachine draft
Prospective observational study of treatments for unexplained chronic fatigue.
Bentler, Suzanne E, Hartz, Arthur J, Kuhn, Evelyn M · The Journal of clinical psychiatry · 2005 · DOI
Quick Summary
This study followed 155 people with chronic fatigue over 2 years to see which treatments they found helpful. Researchers asked participants about medications, supplements, exercise, yoga, and support groups they tried. While some treatments like yoga and vitamins were associated with feeling better, other treatments like magnesium and support groups were linked to feeling worse—though it's unclear why.
Why It Matters
This study provides preliminary evidence that some accessible interventions (especially yoga) may benefit ME/CFS patients and highlights the need for rigorous randomized controlled trials. Understanding which treatments users find most helpful can guide future research priorities and inform discussions between patients and clinicians about evidence-based options.
Observed Findings
- Yoga use at 6 months predicted significant fatigue improvement by 2 years (p=0.002), particularly in subjects without cognitive dysfunction.
- Coenzyme Q10 was reported as helpful by 69% of users (13 subjects), DHEA by 65% (17 subjects), and ginseng by 56% (18 subjects).
- Magnesium use at 6 months was associated with subsequent fatigue worsening (p=0.002).
- Vitamins showed a trend toward fatigue improvement (p=0.08).
- Support group use was associated with fatigue worsening (p=0.06).
Inferred Conclusions
- Yoga appears worthy of further testing in randomized controlled trials for ME/CFS, especially in patients without cognitive impairment.
- Certain herbal and nutritional supplements (CoQ10, DHEA, ginseng) are used and perceived as helpful by ME/CFS patients, though formal efficacy testing is needed.
- The counterintuitive associations between magnesium/support groups and worsening fatigue warrant investigation into whether these reflect reverse causality or confounding.
Remaining Questions
- Why did magnesium and support groups associate with fatigue worsening—did sicker patients use these interventions, or do they have harmful effects in ME/CFS?
- Do the positive associations with yoga, vitamins, and vigorous exercise reflect true benefit, or are they explained by bias (e.g., healthier patients more able to exercise)?
What This Study Does Not Prove
This observational study cannot prove that any treatment caused improvement or worsening—people using different treatments may differ in important ways (severity, disease duration, other factors). The finding that magnesium and support groups were associated with worsening does not mean they caused worsening; patients feeling worse may have turned to these interventions. Small sample sizes for individual treatments limit confidence in any single finding.
Tags
Symptom:Cognitive DysfunctionFatigue
Method Flag:PEM Not DefinedWeak Case DefinitionNo ControlsSmall SampleExploratory Only
Metadata
- DOI
- 10.4088/jcp.v66n0513
- PMID
- 15889950
- Review status
- Machine draft
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 8 April 2026
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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