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The allergic symptoms in Type 3 immune reactions are delayed in onset, appearing anywhere from within two hours up to several days after consuming allergic foods.

Unfortunately, delayed food allergy involves commonly eaten foods, foods that you eat every day and may even crave.

Because delayed-onset food allergies are so often undetected and untreated, they lie behind many of chronic medical conditions of unknown cause. These allergic people suffer for years, even decades, without ever suspecting that their health problems are rooted in what they eat.

Delayed food allergies are skin-test negative. The traditional skin tests are poor tests for detecting delayed food allergies. Instead, delayed reactions food often require state-of-the-art blood tests. These tests detect serum levels of IgG antibodies to foods -- IgA antibody as well as IgG in gluten sensitivity and celiac disease.

(source)

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