What role does IgG Unverträglichkeitstest play in Sport?

IgG intolerance tests are often marketed to athletes as a tool to optimize nutrition by identifying foods that may impair performance. However, the scientific evidence for this use is weak. Medical guidelines (e.g., from the German Society for Allergology) advise against IgG-based tests for diagnosing food intolerances, as IgG antibodies often reflect a normal immune response to food components and do not reliably correlate with clinical symptoms. In sports, unnecessary dietary restrictions based on such tests could lead to nutrient deficiencies and reduced performance. Athletes with genuine intolerances should rely on evidence-based methods like symptom-guided food diaries or medically supervised elimination-provocation tests. The IgG test remains a marketing product without solid scientific backing.