De Lorenzo, F, Hargreaves, J, Kakkar, V V · Postgraduate medical journal · 1998 · DOI
This study explored whether some ME/CFS patients might actually have a rare kidney condition called phosphate diabetes, which prevents the kidneys from properly reabsorbing phosphate. Phosphate is important for muscle and nerve function, and low levels can cause fatigue, muscle pain, and depression—symptoms that overlap with ME/CFS. The researchers tested 87 ME/CFS patients and found that 9 of them also had phosphate diabetes.
This study highlights the importance of considering rare metabolic disorders in the differential diagnosis of ME/CFS, potentially identifying a treatable subgroup of patients. If phosphate diabetes is genuinely associated with ME/CFS, targeted supplementation could offer symptomatic benefit and mechanistic insight into energy metabolism dysfunction in this disease.
This study does not prove that phosphate diabetes causes ME/CFS or that it explains ME/CFS in most patients—only 10% of the sample had both conditions. The cross-sectional design cannot establish causation or temporal relationships. The study does not demonstrate that phosphate or vitamin D supplementation actually improves symptoms, nor does it establish the true prevalence of phosphate diabetes in the broader ME/CFS population.
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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