How are IgG and gut health related?

The relationship between IgG and gut health is often misunderstood. IgG antibodies are part of the normal immune system and are produced against food components without indicating intolerance. Commercial IgG food intolerance tests are not scientifically validated; they measure a normal immune response, not pathology. The gold standard for diagnosing true food intolerances remains an elimination diet. Elevated IgG levels may occur with increased intestinal permeability (leaky gut) or chronic inflammation, but a direct causal link to gut health is not established. These tests often lead to unnecessary dietary restrictions and nutrient deficiencies. Evidence: marketing/unclear. Sources: MyBody-X blog on IgG tests. Caveat: No validated clinical application for gut health.