Evidence check: IgG in the context of longevity

The role of IgG antibodies in the context of longevity is not scientifically well-established. IgG food sensitivity tests are often marketed for identifying 'delayed' food reactions, but the evidence for their clinical utility is weak. Elevated IgG levels to foods typically reflect immune exposure rather than intolerance or pathology. Some mechanistic hypotheses suggest that chronic low-grade inflammation mediated by IgG immune complexes could contribute to aging, but large-scale, rigorous studies are lacking. Longevity is influenced by caloric restriction, metabolic health, and inflammation control, but IgG testing has not been validated as a biomarker for aging or as a guide for anti-aging diets. The evidence level is 'mixed': plausible mechanisms exist, but no high-quality human trials demonstrate that eliminating IgG-positive foods extends lifespan or healthspan. Consumers should be cautious about using IgG results for longevity interventions without professional oversight.