Food Allergies vs Intolerances


IgE (Allergies)
IgG (Intolerances)
Immediate onset Delayed onset
Easy to detect Difficult to detect without specialised laboratory testing
Common in children, rare in adults Most common form of food sensitivity reaction in both children and adults
Fixed allergies, usually permanent Usually reversible
Involves 1 or 2 foods Involves multiple foods
Offending foods usually need to be avoided permanently May be possible to reintroduce some foods after a period of avoidance
Release of inflammatory mediators Formulation of circulating immune complexes
Symptoms affect skin, airway & digestive tract Symptoms can affect any tissue, organ or body system

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