Is HLA-DQ2 destiny or just a small risk factor?

HLA-DQ2 is not destiny but a moderate risk factor. The HLA-DQ2 variant (and less commonly HLA-DQ8) is strongly associated with celiac disease – over 90% of patients carry one of these alleles. However, only about 3% of HLA-DQ2 carriers develop celiac disease. This means the gene is necessary but not sufficient. Environmental triggers (e.g., gluten exposure, infections, gut microbiome) and additional genetic factors play a major role. A positive genetic test alone does not justify a gluten-free diet, as doing so without a confirmed diagnosis can lead to nutritional deficiencies and unnecessary restrictions. Clinical diagnosis requires serology (tTG-IgA) and duodenal biopsy. The evidence for the association is strong (human-strong), but penetrance is low. Consumer DNA tests like MyBody-X provide only a risk indicator, not a diagnosis. Consult a physician before making any dietary or medical changes.