Quote Originally Posted by Aristaeus View Post
^This compelled me to do further research.

It seems mine brain fog was not caused by low histamine, but high sugar. To test this theory, I ate a bowl of ice cream--and sure enough, the mist came. Since the low histamine did cause bodily problems, I assumed it was also responsible for brain problems. Alas, I was incorrect.

[Shrugs] Guess I'll just have to stop buying chocolate bars.
This might not be a big deal, but the fact yours is specifically related to sugar set off a red flag in my mind. Is your mental fog/sluggishness accompanied by any kinds of vision problems or anything (something as simple as blurring or difficulty focusing)? Brain fog from fluctuating blood sugar levels is a classic sign of diabetes.