She had to take different foods of the same approximate size and place them on a 2" piece of brown paper bag. Next she rubbed each item on the paper for 20 seconds each, then left it to sit for 2 hours. She chose to use a slim jim, saltine cracker, mayo, and ham. I think it's pretty obvious which had the most fat content, right?
I can tell you that after this she isn't slathering the mayo on quite so thick.