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Overview of Food Allergies

A food allergy is an abnormal immune system response that is triggered by sensitivity to a substance in a certain food. These substances, which are called allergens, usually do not cause a reaction in most people.

Almost any food can cause an allergy. Common food allergy causes include eggs, milk, peanuts, fish, soy, wheat (called celiac disease or gluten-induced enteropathy), shellfish (e.g., lobster, crab, shrimp), and nuts (e.g., walnuts, almonds, cashews). In...Read the full article