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Immune Response and Food Allergies

If you have a food allergy, it means that your body's immune system mistakenly believes that the food is harmful to you, according to the Food Allergy and Anaphylaxis Network. If you eat the food you are allergic to, your body's reaction can affect your breathing, your digestion, your skin and your heart. These foods account for 90 percent of food allergies: milk, eggs, peanuts, nuts, fish, shellfish, soy and wheat.