Myths vs facts: HLA-DQ2 and Sport

The topic of HLA-DQ2 and sport is rife with myths and misconceptions. HLA-DQ2 is a genetic variant strongly linked to celiac disease – about 90 % of celiac patients carry this allele. A common myth is that having HLA-DQ2 alone predicts gluten intolerance or impaired athletic performance. The fact is: HLA-DQ2 is a risk factor, not a diagnosis. Many individuals with HLA-DQ2 have neither celiac disease nor any detectable gluten sensitivity. In sports, it is often claimed that a gluten-free diet boosts performance – but for people without celiac or confirmed sensitivity, evidence from controlled trials is lacking. A positive HLA-DQ2 test alone does not justify a gluten-free diet. The evidence base is weak, relying mostly on GWAS associations and mechanistic reasoning, not on robust athlete-specific RCTs. MyBody-X DNA tests can include HLA-DQ2, but interpretation requires medical or nutritional guidance. A test result alone cannot predict dietary tolerance or athletic outcomes. Safety note: If celiac disease is suspected, proper medical diagnosis (antibody testing, duodenal biopsy) must precede any gluten-free diet.