"Soy sauce. Soy sauce also contains tyramine (migraine, sometimes CH trigger) and sometimes monosodium glutamate (MSG). MSG, which is used as an additive in many other foods, has been found to cause cramps, diarrhea and headaches. Additionally, soy has large amounts of salt, which can lead to dehydration – and, therefore, to headaches." (it aint the Na, its the dehy).
Foods That Can Trigger Headaches - Penn Medicine