Evidence check: IgG in the context of Sport

The use of IgG testing in the context of sport lacks robust scientific support. While IgE tests are validated for immediate allergic reactions, IgG tests are often marketed for food intolerances or performance optimization. Current evidence indicates that IgG levels frequently reflect normal immune exposure to foods and do not reliably correlate with symptoms or athletic performance. Studies have not demonstrated a consistent benefit for sport performance, recovery, or body composition based on IgG-guided dietary changes. MyBody-X does not appear to offer a specific IgG sport test; the allergy test product page does not specify IgG, and the Q&A database states that IgG tests are not clinically validated for food sensitivities. Athletes should rely on evidence-based nutrition strategies rather than IgG results. Consulting a physician or sports dietitian is recommended for genuine intolerances. The evidence level is unclear to weak.