You sound like you are well on the right track with those two girls. I am quite for allowing there to be some treats, some junk in the house. It's important for kids growing up to have access to things they will need to learn to moderate if this makes sense. They need to learn to control this and when it is okay to eat, and when it is not, and how much, and how often. If they grow up being taught this because it is around they are more likely to be responsible towards it later on. Plus, if I had kids I'd also be giving them options to help push them towards wanting healthier treats over the junk. (Of course I will never have kids, I just have no interest) Honestly which is more satisfying? A fresh bowl of strawberries all cut up with a little bit of whip, or a handful of skittles? Which is going to really end up being more desirable? A small bag of chips, or a few slices of water melon? Which satisfies the crunch more? Chips/popcorns or carrots? Help turn them on early. Then when they are all grown they know what junk is, but they have hopefully developed a taste for better alternatives.