Food allergens: identification, cross-reactivity, and advances in detection strategies

A food allergen is a protein in food that causes an immune system overreaction, resulting in an allergic reaction. Food allergens, including common triggers like milk, eggs, peanuts, and tree nuts, provoke immune responses mediated by IgE antibodies. With food allergies on the rise, particularly among young children in Western nations, the need for accurate identification and management has never been more critical. The article focuses on newly identified allergens from the Cupin and Prolamin superfamilies-groups of proteins that play key roles in seed storage and cereal grains-highlighting their potential to cause severe allergic reactions. A particularly fascinating aspect discussed is cross-reactivity among different food allergens. This happens when IgE antibodies, initially produced in response to one allergen, mistakenly recognize similar proteins in another food, creating a cascade of allergic reactions. For instance, those allergic to peanuts may also react to tree nuts, or individuals with fish allergies may experience symptoms when exposed to other seafood. Such cross-reactions underscore the complexity and unpredictability of food allergies. Different data management strategies for diagnosing and managing food allergies are described, emphasizing a detailed clinical history, which remains the most essential diagnostic tool. Effective management requires a multidisciplinary approach, with clinicians, dietitians, gastroenterologists, and psychologists working together to ensure a holistic care plan for individuals affected by food allergies. Allergen detection technologies, including DNA-based methods, SDS-PAGE, ELISA, and Lateral Flow Immunoassay (LFIA), each offering unique advantages and challenges, are also discussed.