When a food triggers an IgG-mediated immune response, it is because the body is unable to eliminate the food antigen and antibody complex that forms. As a result, an inflammatory response is generated in the body, wherever the food antigen-antibody complex deposits. IgG-mediated food reactions can manifest immediately or have a delayed onset (up to 72 hours post-ingestion of the offending food). Such a reaction is known as IgG-mediated food reaction or “food sensitivity”.