Five-second rule
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In folklore, the five-second rule states that food (or sometimes cutlery) dropped on the ground will not be significantly contaminated with bacteria if it is picked up within five seconds of being dropped. Some may truly believe this assertion, whereas most people employ the rule as an amusing social fiction that allows them to eat a dropped piece of food, despite the potential reservations of their peers.
There can be many variations on the rule where the time limit is modified. In some cases, the person picking up the food arbitrarily extends the time limit based on the actual amount of time required to retrieve the food.[citation needed]
The amount of bacteria differs from surface type - however, the claim previously stated on this page (that food dropped on carpet will be harmless to eat but food dropped on a tiled floor may kill you) is not only too broad in scope to be established as fact, but is also likely to be false according to all active links listed in this article. Most certainly, dropping food onto carpet cannot be seen as a guarantee that the food will be in a sanitary condition when ingested - to imply such is both ignorant and dangerous given modern knowledge of infectious microorganisms.
Research
The five-second rule has received some scholarly attention[1] and has been studied as both a public health recommendation and as a sociological effect.
In 2003, Jillian Clarke of the University of Illinois at Urbana–Champaign found in a survey that 56% of men and 70% of women surveyed were familiar with the five-second rule. She also determined that a variety of foods were significantly contaminated by even brief exposure to a tile inoculated with E. coli.[2] On the other hand, Clarke found no significant evidence of contamination on public flooring.[2] For this work, Clarke received the 2004 Ig Nobel Prize in public health.[3] A more thorough study in 2006 using salmonella on wood, tiles, and nylon carpet found that the bacteria were still thriving after twenty-eight days of exposure under dry conditions.[4] Tested after eight hours' exposure, the bacteria could still contaminate bread and bologna in under five seconds, but a minute-long contact increased contamination about tenfold (with tile and carpet surfaces only).[5] The five-second rule was also featured in an episode of the Discovery Channel series MythBusters. There was no significant difference in the number of bacteria collected from 2 seconds exposure as there was from 6 seconds exposure. The moisture, surface geometry and the location the food item was dropped on did, however, affect the number of bacteria.[6]
Ted Allen put the rule to the test in an episode of Food Detectives,[7] and found that bacteria will cling to food immediately. High traffic areas will lead to even more bacteria on the food.
Vsauce YouTube channel also dedicated a video to this topic.[8]
Notes and references
- ↑ Julie Deardorff "Capsule: The five-second rule" The Los Angeles Times, August 9, 2010, accessed January 18, 2011.
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- ↑ Winners of the Ig Nobel Prize: The 2004 Ig Nobel Prize Winners
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- ↑ https://www.youtube.com/watch?v=rYXdsOEWBj0
