Overridding the node.tpl.php File
If you've done much Drupal theming, then you're probably aware that you can override the default node.tpl.php template file on a per-content type basis. For example, if you have a content type called "food", then you can create a node-food.tpl.php that will be used only when nodes of type "food" are displayed.
A full list of template suggestions can be found on drupal.org.