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The Basics of Food Allergy by Jeffrey Frasco

An allergic reaction is caused when the body perceives a substance to be a threat to the it. The exact reason why the substance is perceived as a threat is not known. The most common substances known to cause allergic reactions are milk, eggs, peanuts, soy, wheat, tree nuts, fish and shellfish (including shrimps). Allergic Reaction to milk, eggs, wheat and soy may occur early in life but may also disappear with age. Tree nuts and peanuts may also cause reactions at an early age but are rarely outgrown. Sensitivity to fish and shellfish happens during the adult years and are never overcome.

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