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A more efficient method is a skin allergy test (skin prick test). It allows for testing lots of allergens in parallel.

https://en.wikipedia.org/wiki/Skin_allergy_test

A quick search shows that it works for gluten intolerance/celiac disease too.

My mom went through this back in the 80s or so after having mysterious issues - turned out it was raw(ish) onion that was the culprit.

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Doesn’t help with carbohydrate intolerances. If there’s any carb structure your body can’t crack apart, you will get those exact symptoms due to over feeding the microbiome.

Sorry, gluten intolerance, and there are many variationions - I have a form with an occurrence of one in 10,000, possible 1 in 100.000 - CON NOT be diagnosed with a prick test. A wheat allergy, which is a totally different thing, might be.

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