This would be a perfect activity to reinforce how math concepts can be applied in real life situations. Have the students write or type a final copy of their results and hand it in with their visual food pyramids. Have students create multimedia presentations to showcase what they have been learned about health related concepts throughout the school year. Projects should include information relating to nutrition and exercise. If the students created their food pyramids in Inspiration, they can export the food pyramids as jpeg files and import them into a program like HyperStudio or PowerPoint.
Older students can create board games to teach younger students different facts about nutrition.
You could also have a specialist come speak to your class about the importance of nutrition and exercise. A school cafeteria manager might be a good resource on the subject as well.