WDEIA

Wheat-dependent exercise-induced anaphylaxis (WDEIA) is a rare form of IgE-mediated anaphylaxis triggered by the combined exposure to wheat ingestion and physical exercise. Symptoms typically occur within about two to four hours after consuming wheat if exercise follows within a few hours, and can include hives, flushing, angioedema, abdominal pain, wheezing, throat tightness, dizziness, and in severe cases shock.

Pathophysiology involves IgE antibodies directed against wheat allergens, with ω-5 gliadin (Tri a 19) repeatedly implicated. Exercise and other cofactors such as nonsteroidal anti-inflammatory drugs, alcohol, or heat can increase intestinal permeability and enhance allergen absorption, promoting mast cell degranulation and systemic symptoms. Some individuals may tolerate wheat without exercise, and reactions do not occur without the combination of wheat ingestion and exertion.

Diagnosis is based on clinical history and supportive laboratory testing for wheat-specific IgE antibodies; component-resolved diagnostics can help identify sensitization to ω-5 gliadin. A supervised oral food challenge that combines wheat ingestion with controlled exercise is considered the gold standard for diagnosis but carries substantial risk and is performed in specialized settings. Baseline tryptase levels and evaluation for alternative causes of anaphylaxis may be indicated.

Management focuses on avoidance: avoid wheat-containing foods before planned exercise and for several hours afterward. Patients should carry and know how to use an epinephrine auto-injector and have an emergency action plan. Education on trigger recognition, medical alert identification, and prompt treatment of anaphylaxis is essential. Prognosis improves with strict avoidance of the triggering combination, though the condition can persist long-term.