RDA's and food labelling http://en.wikipedia.org/wiki/Reference_Daily_Intake http://en.wikipedia.org/wiki/Reference_Daily_Intake Then you can hide the fact th

RDA's and food labelling http://en.wikipedia.org/wiki/Reference_Daily_Intake http://en.wikipedia.org/wiki/Reference_Daily_Intake Then you can hide the fact they are doing math while teaching them about healthy eating. Incorporate things like http://www.sugarstacks.com/ http://www.sugarstacks.com/ and http://www.wisegeek.com/what-does-200-calories-look-like.htm http://www.wisegeek.com/what-does-200-calories-look-like.htm and you can have some interesting projects going