Dinosaur Train, but it is a big deal in our house. A BIG deal. It's the only kids TV show we watch. My little man could care less about Diego or Thomas anymore, he's all about the dinosaurs. And there's nothing cuter than a 3 year old declaring "Mommy, I have a hypothesis!"
A big part of the dinosaur facts they present is about the dinosaur diet. They talk a lot about the differences between meat eaters & plant eaters. It's given my son a huge appreciation for the joys of eating "leaves." He brings his toy dinosaurs to the dinner table and asks for a bowl of leaves for them. And then there's the garden. Most of our kale and beet leaves look pretty darn scraggly, because he walks right up and takes big ol' bites out of them like a triceratops.
Now I'm not saying that Dinosaur Train is going to have every preschooler eating their greens. Mom and dad have to set a good example, and of course kids need to opportunities to see that vegetables come from the earth instead of a bag. But people who believe that children need processed junky "kid food" obviously don't have as much imagination as a 3 year old!