Earl, Kate E, Sakellariou, Giorgos K, Sinclair, Melanie et al. · BMJ open · 2017 · DOI
This study investigated whether low vitamin D levels contribute to the fatigue experienced by people with ME/CFS. Researchers compared 92 ME/CFS patients with 94 healthy controls and found that ME/CFS patients actually had higher vitamin D levels, often because they were taking vitamin D supplements. Importantly, there was no connection between vitamin D levels and how fatigued patients felt, suggesting that vitamin D deficiency is not a cause of ME/CFS fatigue.
Since severe vitamin D deficiency is known to cause muscle fatigue and myopathy, this study addresses an important question about whether correcting vitamin D status could improve ME/CFS symptoms. The findings suggest that vitamin D supplementation alone is unlikely to resolve fatigue in ME/CFS patients, helping redirect research and clinical efforts toward other potential biological mechanisms.
This study does not prove that vitamin D plays no role in ME/CFS; it only shows that baseline deficiency is not a primary contributor to fatigue severity in this cohort. The cross-sectional design cannot determine causality or whether vitamin D supplementation might help a subset of patients with very low baseline levels. The study also does not address other forms of vitamin D metabolism or tissue-level vitamin D status.
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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