Different allergen antibodies have different timelines.
IgE (Immunoglobin E) are antibodies the body produces in response to an allergic reaction to foods/beverages and/or the environment. These reactions occur within a few minutes to hours of ingesting or coming into contact with the triggering allergen.
Elevated IgE levels in the blood can be a sign that a patient’s body is reacting to an allergen. This means the allergen is present in the body and is causing an ''allergic reaction'' which can generate serious symptoms. The allergen response also stimulates the release of histamines in the body. Some key symptoms of IgE mediated response include: Itching, sneezing, hives, coughing, difficulty breathing and even anaphylaxis in extreme cases.
IgG (Immunoglobin G) is the antibody response that causes food/environmental sensitivities with a delayed reaction of 3-72 hours. These sensitivities can improve and may be less severe than IgE reactions.
Symptoms of IgG-mediated food/environmental intolerance can be general or specific. The symptoms may show up many hours or up to 3 days after consumption of a ''trigger food'' or contact with a "trigger substance". This makes the allergy culprits extremely difficult to identify without testing.
In general, you may feel fatigued and easily exhausted despite eating all the right ''healthy'' foods, or you may even suffer from Chronic Fatigue Syndrome which can lead to depressive symptoms. Conditions associated with IgG food sensitivities include: irritable bowel syndrome (IBS), major depressive disorder, migraines, skin rashes such as eczema, joint aches, autoimmune disease, Crohn’s disease, obesity, etc