I say no to foods a lot, but just to my D child. I say no to food after dinner unless she's low, because she has reflux and D and we get little enough sleep as possible, whereas I might say yes to my oldest because he stays up a lot later and can tolerate it. We have always been careful with what snacks our kids have on a regular basis, so it hasn't changed much since diagnosis. However, like others, there isn't a food that I tell her she can never ever eat, just only on a very rare occasion . . .