No one knows why the immune system produces antibodies to certain foods, but when it does, a noticeable food reaction may result. Lab tests can measure for food-specific reactions to three different antibodies: IgG, IgE and IgA
Only IgE reactions are considered true food allergies. IgE reactions typically occur within minutes of exposure to a food. These IgE reactions include: hives, itchy watery eyes and breathing difficulties.
A Food Sensitivity is a term that usually refers to delayed immune reactions to foods. For example, IgG and IgA reactions to foods are commonly referred to as food sensitivities.
Leaky gut syndrome is primarily responsible for the food proteins passing through a damaged intestinal wall into the bloodstream. Once in the blood stream the body mounts an immune response. Some symptoms of delayed food intolerances include: bloating, gas, aches and pains, joint pain, migraines, hives, fatigue and brain fog.