Japanese Pediatric Guideline for Food Allergy 2012 (JPGFA2012) has been published from Japanese Society of Pediatric Allergy and Clinical Immunology in Oct. 2011. The definition of food allergy was revised from "a phenomenon in which adverse reactions (symptoms in skin, mucosal, digestive, respiratory systems, and anaphylactic reactions) are caused in living body through immunological mechanisms after intake of causative food." in JPGFA2005 to "a phenomenon in which adverse reactions are caused in living body through antigen-specific immunological mechanisms on exposure to a causative food" in JPGFA2012.
The point of this change in definition is the entry route of food into living body. The entry of food into the body is limited to ingestion in JPGFA2005, in contrast, is expanded to any pathways such as skin contact, inhalation and injection in JPGFA2012.
This change was motivated by the definition of food allergy in the guideline presented by National Institute Health in USA and the multiple reports of food allergy by the hydrolyzed wheat proteins in the cosmetic soap.
That is, food allergy is a hypersensitive reaction caused by "food" through any entry routes into the body. This is the same category as insect allergy or metal allergy which is termed depending on causative allergen.
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