>>2632037
Easiest one for elementary age kids, that doubles as a lesson in reading nutrition labels:
Go to the breakfast cereal aisle in the grocery store.
What kind of cereals are on the lower shelves, so people who are less than 5 feet tall will notice them first?
Are the boxes brightly colored? Cartoonish mascots?
Pick one of those boxes and look at the nutrition label. How much sugar per serving?
Lesson 2:
Look at the "adult" cereals on the top shelves.
Big marketing push as "healthy".
Check the graphics on the front of the box.
Wheat, nuts, berries
Now check the nutrition label and the price.
How much bang are you getting for your buck?
It'd be so much cheaper to just buy a big box of quick-cook oatmeal and throw some berries in it, and just as fast.
No need to give a test on this information, because everybody remembers it from then on.
Extra credit: Dig on the way Big Food aggressively strategizes with grocery store chains for product positioning in stores.