op I believe my sister has also tried various exclusion diets to help but I'm not aware that any of them did.
Changing the food you put in yourself is in no way comparable to the rest of the nonsense you are considering.
Of course the food you intake can and does affect the biochemistry of your body. The key thing is not to try random made up bullshit methods for selecting said foods, but talk to someone with some genuine real medical qualifications in the area who can advise you what type of changes are more or less likely to make a difference. Then you need to be incredibly careful about keeping accurate notes of the effects and if possible get a third party to help monitor you.
I know someone who was convinced their baby was reacting badly to their breastmilk and went on a mad rampage of exclusions while waiting for an allergy test. By the time the baby got seen she has ruled out gluten, dairy, garlic, all hot spices, celery and strawberries.
The baby had no sign of allergy or intolerance in any of the tests done. Friend went back to eating instead of stressing and magically the problems cleared up.
People see patterns...we can't help it...we just always do it...whether they are there or not. It would be awful to make an error and end up making your life harder for no actual benefit. So be careful when measuring the success of any dietary changes!