Myths vs facts: IgG and Langlebigkeit

IgG antibodies are part of the adaptive immune system, and their levels can shift with age. Some companies claim that IgG tests (e.g., against foods) can provide insights into 'biological aging' or longevity. Scientifically, this is not supported: IgG levels vary widely between individuals, are influenced by acute or chronic infections, vaccinations, and autoimmune conditions, and are not a validated biomarker for lifespan. While research on immunosenescence shows changes in IgG subclasses with age, these do not translate into direct longevity predictions. The myth that IgG testing can serve as a 'longevity diagnostic' is therefore largely marketing. Evidence: mixed (basic research on immune aging, but no validated tests for longevity). Caveat: No consumer IgG test can predict your lifespan.