Some of the negative effects of coffee are that it can stain the teeth and cause digestive orders. Click on the tab under the negative effects to view a more elaborate description.
Picture References:
http://steaming.files.wordpress.com/2010/01/whitening_before.jpg
http://www.naturalremedies.org/images/digestive-disorders-1.jpg
http://steaming.files.wordpress.com/2010/01/whitening_before.jpg
http://www.naturalremedies.org/images/digestive-disorders-1.jpg