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Food allergies are very common and can have a significant impact on the lives of those affected. Certain components in food, which are tolerated without any problems by most people, trigger unwanted allergic reactions in allergy sufferers, ranging from mild symptoms to severe, potentially life-threatening reactions. Each allergen is assigned a specific letter. In the following article, you can read basic facts about the 14 most common allergens, which letters are assigned to them, which foods they are found in, and what symptoms they can cause.