I encourage my child to eat small amounts of fruits during snacks. It's a good thing the school my son goes to also promotes healthy eating, so he is aware of "good food" and "bad food". I usually give him bite size servings of apples, grapes, bananas and mango since they are usually easy to find at any month.
When he catches me eating junk food or drinking soda, he would immediately remind me, Mommy teacher said that's bad food.