This document discusses food allergies, including what they are, how the immune system responds, common allergens and symptoms, and how allergens are labeled on packaged foods. It provides information on specific food allergies such as milk, egg, peanut, soy, fish, wheat and tree nuts. It also discusses allergic diseases including hay fever, eczema, asthma and anaphylaxis. Prevalence data on allergic diseases in children in Pakistan is presented. Food manufacturers are required to clearly label major allergens on packaged foods.