Does anyone ever check the kids diet, exercise and sleeping habits before putting them on some of this crap? I've seen some that are drinking cokes and eating candy at all hours of the day causing numerous behavior problems.......that's why I've always regulated how much my kids had of that stuff.
That can factor especially if they have food allergies. I would limit a kids sweets intake though. As an adult caffeine doesn't seem to bother me one way or the other. I drink about 4 cokes a day. As a teenager I drank 1-2 cokes a day and milk at home. Now milk gags me.
Seriously I don't think it's the food near as much as food additives that may be causing problems. A good gastro doctor for example deplores some milk products and especially processed meats and MSG. Used to years ago Bologna tasted good and didn't hurt my stomach now I can't eat a bite of it due to taste and reaction. Growth hormone's etc in our food chain may cause some problems also IMO.