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

Chronic fatigue has many causes, and a DNA test alone cannot diagnose it. Some genetic variants (e.g., in VDR, MTHFR, or GC) may influence vitamin D, folate, or cortisol metabolism, but the evidence linking them directly to fatigue is weak. Official guidelines (e.g., from the Endocrine Society or DEGAM) do not recommend routine genetic testing for fatigue. Lifestyle factors, sleep disorders, iron deficiency, thyroid issues, and stress are far more common causes. Consumer DNA tests can provide clues but lack clinical validation for this purpose. The MyBody-X articles on vitamin D and chronic fatigue also highlight the need for professional interpretation. Evidence: human-moderate for some associations, but overall unclear for fatigue. Caution: do not rely solely on genetic results; consult a doctor.