I cannot really remember whether desserts at any time changed patterns for us, but the raging until you get some food into them and they turn into a sweet child instantly - that used to be DS1. Umm, that is me on many days, only I barely hold it together, merely snapping at my husband. He comes by it honestly!
I have recently started to take our family off sugar and wheat (gone primal, in effect) and while I have not yet managed to turn myself into a fat-burner, the kids appear to have changed their metabolism much faster than I - actually I think I may be pre-diabetic. Might also be to do with breastfeeding, but I digress - check out Primal eating or the Perfect Health Diet, life is much calmer in our house these days with the kids eating so much healthy fat and protein. There is life beyond a-snack-every 2.5 hours, I promise!
I do feel somewhat more energetic these days, fewer energy slumps, cravings, shakiness and brain fog, but I am not yet "cured". I would love to do a whole30 soon with the whole family but am not quit ready yet, too much going on right now.
Apparently, some people's digestion breaks up milk and/or wheat into opioid molecules which can be addictive. You may want to check out Cure your Child with Food by Kelly Dorfman (formerly What's eating your child) who has a chapter about that one. If you think it's rather a grain or sugar problem, you may want to check out Wheat Belly.