An estimated 3.5 to 4% of adults, and 6 to 8% of children, are allergic to foods. More than 10 million people in the United States alone are known to have a food allergy. Although researchers have identified more than 160 foods that contain naturally-occurring proteins that have been shown to cause allergic reactions, researchers also estimate that 90% of all food allergic reactions are caused by just eight common foods: peanuts, eggs, milk, soy, wheat, crustaceans, fish and tree nuts (e.g., walnuts, hazelnuts, almonds, cashews, pistachios, pecans, etc.). Peanuts are the leading cause of severe food allergic reactions.