Trying to force children to eat food that is healthy is also not the answer because they also then label the healthy food as "Chore" food and the junk food as "Reward" food.
Parents need to limit the amount of junk food that they buy for their children and not use them in the form of Rewards or to shut the child up (As is normally the case)
Also limiting the amount of adverts the child can see can also help but that would require a limit to the amount of TV...etc they watch.
It is a big problem and it does not help matters that children are one of the main groups to market towards because they are easy to impress and the faster the child gets hooked on sugar junk, the faster they will want more of it.
It requires a hands on approach and the parents must also lead the way in this area as well. Can a parent deny themself junk food, sugar, choc...etc so that their child does not follow in their footsteps?
Lead by example, I say and that can be harder then it seems when the sugar cravings kick in.