IGHE and food allergy: The typical example is sensitization to plant foods secondary to pollen allergy—detecting IgE to the cross-reactive component (e.g., Ara h 8, Cor a 1) helps differentiate from primary systemic food allergy, associated with sensitisation to primary food allergens (for example, seed storage proteins Ara h 1/2/3/6 and Cor a 9/14).