I don’t usually talk about my diet issues, but in the rare cases it comes up, frequently people tell me they cannot figure out what exactly is causing their issues. They don’t think they have any issue with any one food, but they do feel a lot better when they eat out less, or eat less processed foods. Setting aside the fact that they may never have done an experiment on themselves controlled well enough to actually pin point their problem, I wondered what kind of things might be the culprit if we took this statement “feeling better with less eating out and less processed foods” at face value.
Histamine and/or other biogenic amines, mold, additives, even dust, dust mites, or other insects come to mind.
In practice it may be very difficult to narrow down the culprit much further. But then that may not make that much of a difference as there is a lot of overlap in the foods that potentially contain the substances listed above.