Evidence check: IgG Unverträglichkeitstest in the context of Sport

IgG food intolerance tests are often marketed to athletes to supposedly identify performance-hindering foods. However, the scientific evidence is weak: IgG antibodies merely indicate immune exposure, not intolerance or inflammation. Studies show no reliable predictive value for athletic performance or recovery. Moreover, unnecessary dietary restrictions risk nutrient deficiencies. For athletes, validated methods like physician-supervised elimination diets or breath tests for lactose/fructose intolerance are more appropriate. This test is best classified as marketing, not evidence-based diagnostics.