Evidence check: IgG in the context of Langlebigkeit

IgG tests (especially IgG4) are often marketed for food sensitivity, but the evidence for their role in longevity is weak. Elevated IgG levels typically reflect normal immune exposure, not pathology. No robust human trials show that IgG-guided dietary changes improve lifespan or healthspan. The evidence is mostly mechanistic or from small, uncontrolled studies. Be cautious of marketing claims. For longevity, validated biomarkers like HbA1c, lipids, or inflammatory markers (CRP) are more relevant.