Myths vs facts: IgG and fatigue

The claim that IgG antibodies against foods are linked to fatigue is not scientifically supported. IgG tests are often marketed as 'food sensitivity tests', but the medical community rejects them as a diagnostic tool. Fatigue can have many causes: lack of sleep, stress, iron deficiency, thyroid problems, or chronic inflammation. A positive IgG result merely indicates that the body has produced antibodies – this is a normal immune response and not evidence of an intolerance. True food allergies are mediated by IgE antibodies and show acute symptoms. MyBody-X offers an IgE allergy test, not an IgG test. Anyone suffering from chronic fatigue should seek medical advice and not self-diagnose based on IgG tests.