Most people can eat almost any food without any problems. However, certain foods trigger a response by the immune system in about 5 percent of children and 4 percent of adults. In these people, the immune system reacts as if that food is something that the body should get rid of. These improper immune responses are called food allergies.
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About 90% of serious food allergies in the U.S. are caused by just eight types of foods: milk, egg, peanut, tree nuts, soy, wheat, fish, and shellfish.