Well I don't know about other parents but my son could point out a Mc Donald's sign before he could talk! I am a big advocate of teaching your kids healthy eating habits early. Until my oldest son was 2 not a drop of sugar entered his body (or so I thought).
I came across the movie Super Size Me at the video store a couple of years ago and man was I blown away. If you have not seen the movie it is worth your time to watch. Not only for your health but especially your children's.
Since watching this movie we do not eat at McDonald's very much anymore. No wonder our kid's are so obese these days.
So watch for yourself and see if you agree.