There are some people, from what I’m told, who get hyper from wheat gluten (the binding agent in bread), but that’s celiacs, and an intolerance due to the lack of an enzyme, and not a true allergy. Celiacs is indicated by lots of digestive issues, whereas allergies tend to come with rashes or anaphalaxis (swelling, esp. the throat, which is why it’s dangerous).
The good news is that actual allergies are cyclical and you should have them tested every seven years or so. After becoming rather abnormally rashy and lethargic around puberty, I was tested and was found to be allergic to hops and whole wheat. I was recently tested again at 35, and showed no sign of those allergies. This was confirmed by me eating lots of good bread and drinking lots of good beer 
As far as ADD goes, when I used to get into whole wheat (allergic), thinking it was white (not allergic- the allergen was bleached out) I was far from hyper. I was completely knocked out for hours. I’d also wake up with a rash all over.
I’ve heard some things like berries cause hyperactivity to get worse, but I haven’t seen the research (although I’m open to reading, if anyone else knows where to find it), just anecdotal stuff. I never tested positive for allergies to berries. However, what I read didn’t claim allergies, but some sort of dietary reaction other than that. There definitely seems to be a dietary link to ADD where Omega 3 is concerned, and I’ve read that ADD kids have more food allergies, but I’m not sure if it’s causative or correlative.
FWIW, my brothers and my father also have ADD and they have no history of allergies. I’m the only one in my family that has any allergies whatsoever. The thought has been put out there that it’s not that ADD is a factor, as much as estrogen, in my case. Would love to see legitimate research on that, too. I’m sure it’s all out there, but it would require a lot of hyperfocus on the internet, right now.
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