Yes my older dd (11) has allergies. I have never had them pinpointed however.
1)She can have REAL lemons but give her "fake" lemon products and she gets "sick"/feels bad. He face may or may not turn red.
2) When she was little and now (but not as bad) her face will become swollen, chapped and red within minutes of eating certain Nacho cheese sauce. I mean you can watch her face change right before your eyes. As she has gotten older it has changed, I think, into stomch issues.
3) To address the behavior, ah well I know that foods do affect her, but I never have sat down to try a formula. It would be very difficult but I am sure it is possible to pinpoint which foods make her hyper.
Thanks for the info, I may have to look into this as well.