Jillian Clarke was recognized recently by the Annals of Improbable Research for her groundbreaking experiments debunking the Five-Second Rule. According to Ms. Clarke’s research, a piece of food dropped and then left to lie on the floor (or other probably dirty surface) for 5 seconds can collect a heck of a lot of bacteria, say perhaps a number between 150 and 8000. That’s enough to make you real sick. The experiments were conducted with slices of bologna
and with slices of bread. ![]()
Okay, this did make me think because I am likely to eat something that I have dropped, provided I dropped it on my own kitchen floor and not the floor of the bus station or ball park. When making that split second decision, to eat or not to eat, several judgements come into play. Ms. Clarke discusses two of the three factors I consider critical: the relative filth of the surface and the contact duration.
That said, what about the stickiness factor, as in, how sticky is the food? If you drop a wet lollipop you throw it away, right? There is no blowing off the dog fur, sand and crumbs, let alone the salmonella. On the other hand, something nice and dry, a chip or cracker for example, seems perfectly palatable after a good bloosh of air on both sides, no?
What I’m getting at is this, if I drop my bologna I hope it’s between two slices of nice bread and stuck tightly with mayo or mustard. Then I plan to pick it up, blow it off and eat it. That is unless I dropped it in the ladies lounge.
Harold McGee, famous food scientist, writes in detail about bologna, bread and bacteria in a story entitled The Five-Second Rule Explored, Or How Dirty Is That Bologna published May 9, 2007 in the New York Times. Read Mr. McGee’s full story here.









