Start by reading the book, The Very Hungry Caterpillar by Eric Carle. This book teaches about different types of foods. After reading about all the foods the caterpillar ate, place bite-sized pieces of the fruit he ate out on the table for the children to sample. These include apples, pears, oranges, plums and strawberries. Discuss that fruits are good foods.
Then talk about all the junk foods the caterpillar ate, such as chocolate cake, ice cream, and candy. Did the caterpillar get a stomachache? Why?
To make a cute "good food" caterpillar, cut a cardboard egg carton in half lengthwise. This will make a caterpillar body. Invite the children to use a pipe cleaner (folded in half) for the antennae. Help them to tape this onto the head of the caterpillar. The children can paint the caterpillar if they wish.
Challenge the children to search through magazines and supermarket ads and cut out pictures of healthy foods, some that were mentioned in the book and others that they know are healthy to eat. Let them glue these pictures on the caterpillar's body to show the good foods he ate or could have eaten.