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Re:Left brain hemisphere more awake the first night sleeping... by tpmx on Sunday February 14, 2021 @01:11PM (#26134597)
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.

Re:Left brain hemisphere more awake the first night sleeping... by danielheath on Sunday February 14, 2021 @03:29PM (#26135960)
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.
Re:Left brain hemisphere more awake the first night sleeping... by gopty on Sunday February 14, 2021 @07:03PM (#26137519)
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.