warum bin ich immer müde — can a microbiome test help?

Chronic fatigue is a common complaint, but microbiome tests are not a validated diagnostic tool for it. The provided context does not include any studies linking gut microbiome composition directly to fatigue in a clinically meaningful way. Fatigue has numerous potential causes: poor sleep, nutritional deficiencies (iron, B12, vitamin D), thyroid dysfunction, depression, sleep apnea, and chronic infections. Microbiome tests typically report relative abundances of bacteria, but they lack standardized reference ranges and cannot diagnose specific deficiencies or diseases. While the gut-brain axis is a real phenomenon, its role in fatigue is still under investigation, and no robust evidence supports using a commercial microbiome test to identify the cause of tiredness. A responsible approach is to first undergo a thorough medical evaluation including blood work and sleep assessment. Only after excluding common causes might a microbiome analysis be considered in a research context. Therefore, the evidence for microbiome testing in fatigue is 'unclear' or 'marketing' at best.