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Food allergies are immune-mediated adverse reactions to specific food proteins that can range from mild gastrointestinal symptoms to life-threatening anaphylaxis. Accurate diagnosis requires careful clinical history, appropriate testing including skin prick tests and serum-specific IgE levels, and sometimes oral food challenges. Management centers on strict avoidance of trigger foods, emergency preparedness with epinephrine auto-injectors, and patient education.
Food allergies involve IgE-mediated type I hypersensitivity reactions where initial exposure leads to sensitization and IgE antibody production against specific food proteins. Upon re-exposure, cross-linking of IgE antibodies on mast cells and basophils triggers rapid degranulation, releasing histamine, leukotrienes, and other inflammatory mediators. This cascade can cause local symptoms like urticaria and gastrointestinal upset, or systemic anaphylaxis affecting multiple organ systems including cardiovascular and respiratory collapse.
Diagnosis requires distinguishing true IgE-mediated food allergies from food intolerances, non-IgE mediated reactions, and other conditions through detailed history of timing, symptoms, and reproducibility of reactions. Testing should be guided by clinical suspicion, as positive tests without clinical correlation can lead to unnecessary dietary restrictions, while negative tests don't always rule out food allergies. Management decisions must balance the severity of previous reactions, patient age and lifestyle factors, and the specific allergen involved when determining monitoring frequency and emergency action plans.