Dairy Council site Check out the nutrition tab Click on the food groups for nutrients and what they do http://www.nutritionexplorations.org/kids/nutrition-pyramid.asp
PBS kids site More specific info http://pbskids.org/itsmylife/body/foodsmarts/article2.html
Dole's website Games (require Flash player), information, check out the fruit and veg nutrition chart, use the fun facts reference section to learn about nutrients, phytochemicals, etc. http://www.dole.com/superkids
Cool Food Planet games and information (British English vocabulary, ie., biscuits=cookies) http://www.coolfoodplanet.org/gb/kidz/index.htm
USDA's website for kids, includes the new pyramid http://www.mypyramid.gov/pyramid/index.html
Kids Health for Kids answers nutrition and other health-related questions http://www.kidshealth.org/kid/stay_healthy/
CNN site - good info about many nutrients http://www.cnn.com/SPECIALS/2007/healthy.bodies/nutrition.html
National Institutes of Health Encyclopedia (lots of medical info) http://www.nlm.nih.gov/medlineplus/encyclopedia.html
Games for Arianna's nutrition explorations http://www.nutritionexplorations.org/kids/activities/arianna.asp