Strange neither specialist migraine neurologist I’ve consulted thought diet important.
I haven’t touched soy sauce since chronic and always have cows milk which doesn’t seem to affect me however I found the case on this link might be of interest to some.
https://www.neurologylive.com/view/case-report-woman-headache-pain-dizziness-and-nausea
By the number of topics on here relating to Soy seems it’s a problem for many.
Soy
Soy milk?
Is soya a trigger
Is Whey or Soy Protien a trigger for you?