There's a pretty good finding here[1] about elimination diets being inappropriate for most patients. Basically without any diagnosis of something like celiac, allergy, etc you have a high risk of misidentifying foods as causes because the co-occur with non food triggers. The literature just seems super weak for most alleged dietary triggers.

[1]https://pmc.ncbi.nlm.nih.gov/articles/PMC12609589/#sec8-nutr...