Healthy eating habits among young children

For my project I am going to explain to third graders why they should eat healthy and show them how almost every junky food has a healthy alternative. I feel as though most people would just tell their kids “Don’t eat that, it’s bad for you” and don’t take the time to explain WHY it’s bad for them or even provide some sort of replacement that IS good for them.I watched a documentary about a year or so ago that went over what goes on in the body when you eat unhealthily, and it really changed my habits and I want to have that same influence on our youth. I feel like if you show younger kids what I saw in a less morbid way, then they’ll change their habits too. I have a slide show ready, and in that slide show I have a few clips of a show called "The Bite-Sized Adventures of Sam Sandwich" which is a 5 minute show that teaches kids about eating healthy. I also have some diagrams to explain what happens when you eat unhealthy and lots of pictures to distinguish good from bad. I also plan to bring in a healthy alternative for a commonly loved junk food. I'm really excited for this presentation :D