Many people exhibit chronic food sensitivity reactions to specific foods. The reaction towards a given food group might be exhibited as an immunological reaction by an increase in either IgG and/or IgE antibodies.
Unlike the immediate effects of IgE-mediated allergy, IgG-mediated food sensitivity reactions may take several days to appear. Food intolerance* refers to gastrointestinal (GI) discomfort due to IgG antibodies which are sensitized by specific food proteins. Irritable bowel syndrome may also be linked to food sensitivity (IgG).