Is FUT2 useful for Müdigkeit?

FUT2 (fucosyltransferase 2) determines secretor status and influences vitamin B12 absorption via intrinsic factor. A non-functional FUT2 allele can modestly lower B12 levels. Since B12 deficiency can cause fatigue, an indirect link is plausible. However, evidence for FUT2 testing being useful specifically for fatigue is weak: effect sizes are small, and diet, gut health, and other genes play larger roles. MyBody-X may include FUT2 in nutrigenetic panels, but its clinical utility for fatigue is limited. A direct B12 blood test is more informative. For persistent tiredness, consult a physician to rule out iron deficiency, thyroid issues, or sleep disorders.