Goedendorp, M M, Knoop, H, Schippers, G M et al. · Journal of human nutrition and dietetics : the official journal of the British Dietetic Association · 2009 · DOI
This study looked at the daily habits (diet, smoking, weight, exercise) of 247 people with ME/CFS and whether these habits affected their fatigue or ability to do activities. Researchers found that ME/CFS patients actually had healthier lifestyles than the general population, eating less fatty food and smoking less. Surprisingly, the study found no connection between lifestyle choices and how severe someone's fatigue or disability was.
This finding challenges the common assumption that ME/CFS symptoms are caused or significantly worsened by poor lifestyle choices. For patients, it suggests that their fatigue is not primarily due to smoking, diet, or weight, potentially reducing blame and guilt; for researchers, it supports the biological basis of ME/CFS rather than a lifestyle-driven etiology.
This study does not prove that lifestyle changes cannot *help* manage symptoms or improve quality of life in ME/CFS—only that lifestyle factors do not explain fatigue severity differences between patients. The cross-sectional design cannot establish causation in either direction. Additionally, the findings are specific to this Dutch population and may not generalize to other populations.
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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