When favorably using symbolic props similar to everyday items (e.g. healthy food items) during pretend play, children build positive associations with these items. It also helps to add little fun facts here and there about the food they are playing with.
For example, “Do you want to know broccoli’s super powers? It makes little kids’ eyes, skin, bones, and teeth super healthy and strong. It has more vitamin C than oranges and helps you get more calcium than milk. And when you eat it regularly, it keeps you healthy so you don’t get sick.
By the way, it also helps if the kids see you eating healthily, too.