I know a kid should be a kid but there's a limit. Your kid shouldn't be eating that crap either so get it out of the house. My kids do get an ocassional "treat" but we don't keep that stuff around the house and they don't whine and complain that they want a cookie.
With that being said, Spike is great for those early morning workouts.
As far as hunger goes, the average person is lazy and weak, so don't be average!