1. A Balanced Diet
Learn the names and sources of food types needed in a balanced diet and the different uses of food in the body. http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/ABDLC/launch.html
Learn about malnutrition and give some examples of diseases caused by malnutrition.
Finally, you can do these funny activities: http://www.bbc.co.uk/schools/scienceclips/ages/6_7/health_growth_fs.shtml http://www.bbc.co.uk/schools/scienceclips/ages/7_8/teeth_eating_fs.shtml