Our food intolerance test is a comprehensive intolerance screening that tests your blood against 283 food extracts and molecular food antigens. Food intolerance is a systemic response of the entire body that is a hidden hypersensitivity. This is not an allergy but an immune system reaction that develops IgG (Immunoglobulin G) antibodies against specific foods. A food intolerance is less severe than an allergy but can still have a significant impact on your day to day life.