This site is geared toward middle schoolers and has a lot of health information. They can find out more about nutrition by going to the Body tab and clicking on the "More on Body" link at the bottom of the page. This takes them to a site that has information about proper nutrition and what they can do to be healthier. This is a good site to use for researching nutrtional requirements.
This site is for younger kids but is does have the nutrition information for fruits and vegetables and the Recommended Daily Intake (RDI) of the fruits and vegetables. The students can get the chart from this site, http://www.dole.com/funfacts-chart9-13.html.
The Pacific Science Center runs this site. There are several games that students can play that has them identifying the nutrition they need and in what they eat. This site also helps students learn if what they're eating is healthy for them.
This site has games and a nutrition tracker students can download to keep track of what they're eating. This is a good site for students to get charts to start their research and a shopping list that encourages students to pay attention to the food pyramid.
This site is from PBS kids has students using a virtual kitchen to solve a puzzle and do experiments. It also has experiments the kids can do in their own kitchens and post the results
This site is for elementary students and has interactive games that allow students to explore food safety, nutrition, and what they need to have a healthy body.