Myth Or Fact..??

After 7pm at nite, we never give the brat anymore things that has got sugar in it, because we noticed that she can be up the whole nite when she does. But lately, I read in a magazine.. that it’s only a myth, that the only thing she would get is cavity if she had anything sugary. Now if that is the case, why does my brat not sleep ..?? or become ultra hyper..?? Can anyone enlighten me..??