How are MY FOODBOOK and Müdigkeit related?

MY FOODBOOK is a MyBody-X product that claims to identify food intolerances via IgG antibody tests or similar methods, which might be linked to fatigue. However, the scientific evidence for such IgG-based tests is weak: they are not recommended by allergy guidelines because results often do not correlate with true intolerances. Fatigue has many causes – from sleep deprivation and stress to iron deficiency or thyroid issues. A commercial test relying solely on IgG or DNA variants cannot capture this complexity. Even if a nutrient deficiency exists, a blood test (e.g., vitamin D, B12, ferritin) is far more reliable than an indirect test. The evidence for MY FOODBOOK regarding fatigue is therefore best classified as 'marketing'. Consumers should be cautious and seek medical evaluation for persistent fatigue.