What role does IgG Unverträglichkeitstest play in skin aging?

IgG food intolerance tests (e.g., KombiCheck) are sometimes marketed for skin aging based on the idea that chronic immune activation from foods could promote inflammation and thus accelerate skin aging. However, the scientific evidence is very weak. Most IgG tests are not standardized, not reproducible, and are explicitly rejected by professional societies (e.g., DGAKI, EAACI). They measure IgG antibodies that often reflect normal dietary exposure, not intolerance or allergy. No validated studies demonstrate a causal link between IgG-based diets and improved skin aging. Skin aging is driven by UV exposure, oxidative stress, glycation, hormones, and genetics—not IgG. If someone still considers such a test, they should know the results are not diagnostic and unnecessary dietary restrictions can lead to nutrient deficiencies. A responsible approach would be a medically supervised elimination diet if a specific food intolerance is suspected.