Food Allergy: What causes a Food Allergy?

Food allergy is an immune system reaction that occurs soon after eating a certain food.

It develops when a person eats, touches or inhales a protein in food called an allergen, and then the immune system makes a type of antibody against the allergen called IgE. Copies of this IgE antibody move through the blood and attach to two kinds of cells in the immune system.

Myth: Each allergic reaction will get worse and worse.

Myth: Each allergic reaction will get worse and worse.