Myths vs facts: Stuhlprobe and fatigue

The claim that a stool test (microbiome test) can definitively identify the cause of fatigue is a myth. While there is some evidence linking gut microbiota to energy regulation via the gut-brain axis, the evidence is mostly mechanistic or based on small observational studies. Factors such as iron deficiency, sleep disorders, stress, or thyroid issues are far more common and better-established causes. MyBody-X may offer stool tests, but the context does not provide specific markers for fatigue. A stool test can offer general insights into gut health but should not replace medical evaluation. The evidence is rated as 'mechanistic/unclear'. Be cautious of marketing claims suggesting a direct causal link.