05/06/2026
If you are experiencing any gut symptoms (opting, co stipation, diarrhea) and you think you might have a food intolerance, please DO NOT waste your money on IgG food intolerance tests!
There is no body of research supporting IgG tests for diagnosing or predicting adverse food reactions and all major allergy and intolerance societies strongly discourages their use.
IgG (especially IgG4) to foods is common in healthy, asymptomatic people and is considered a normal immune response to eaten foods.
Review articles emphasize IgG/IgG4 more often indicate immune tolerance and past exposure, not hypersensitivity.
If you do suspect you may have an intolerance, please speak to your GP and work with a specialist gut health dietitian such as the amazing Geraldine in Wollongong (not an ad, I just genuinely think she is awesome).
Are there any tests you've been sold that you aren't sure were worth the money? Drop them below and I'll do a post on them!