The fast food in advertisements always looks so perfect and delicious. The fast food you usually get, however, usually looks less than appetizing — much like the burger above.

Take a look at this video of a food stylist preparing a burger and fries for an advertisement. It's from an old show called "Buy Me That." If you want to help your children understand some of the tricks behind advertising, this is a good place to start.

Robin Shreeves ( @rshreeves ) focuses on food from a family perspective from her home base in New Jersey.

How food stylists trick us
Why do fast-food burgers and fries in TV commercials and print ads look so fresh and delicious when the real deal never looks the same way? Here's why.