When students have completed the task, ask each group to share with th eclass what they have done. Ask the groups why they have grouped their foods the way they have. Ask students to put the food back in the bags and in front of their desks. Explain to students that they have just done what scientists do. Scientists group things according to similar characteristics.
Scientists use some of the same characteristics that the students have just used.
Scientists have grouped food into a pyramid according to the nutrients they provide and how much of these nutrients humans need daily to stay healthy. Show the food pyramid to the students and ask them what they know about it. Pass out magazines and the brown bag pyramids. Tell students that hey are to cut out pictures of ood and paste them on their food pyramid according to the pyramid. Make sure and emphasize that the groupings they had before were very good and completely right, but now we are going to use the guidelines that scientists have given us.