Every few years, San Diego State researchers and Clorox get together and produce a study showing that the 'five second rule' - how long food can be on the floor and still be safe to eat - is not really true. Instead, germ transmission, like electricity, happens really fast. Researchers told us this in 2010, last year and they told us again today and various other times going back to 2003, when I stopped looking. It's almost like McClatchy/Tribune News is on a contract to give this stuff coverage but they aren't the only ones. It usually happens when it's a slow week for miracle vegetables and/or scare journalism about last week's miracle vegetables.
Well, we always knew that the five second rule was more of a guideline than a rule. It's been around a lot longer than germ theory. I am noodling a book about Genghis Khan and so I have been reading a lot of things about this mass-murdering sociopath. So when I saw what is apparently an annual puff piece from the mainstream media about the five second rule I was reminded about the fluid nature of its historical origins.
History, of course, is rather subjective. I imagine the 5 second rule was 5 days in prehistoric times, when food was harder to come by, so pinning down when it became a 5 second rule is just guessing. Genghis Khan was a rather scientific guy for being a homicidal rapist maniac so he had his own notions on how long food could be on the ground and still be safe. And he was right - obviously eating food off the ground was a lot safer than going to war and he was always going to war. And organic food buyers today think food can sit in pesticides forever, as long as they are organic pesticides.
Even an M&M tried to work the folklore in this 1999 commercial:
Germs can attach themselves, we have known that for a while. But for this study they wanted to find out how long a 'food on the floor' rule might be. They used some carrots (and then a control group of one carrot kept clean, though I have no idea why they think they need a control group or what they consider 'clean') and found that all the surfaces couldn't keep food clean for 5 seconds. Some were worse than others. Countertops fared more poorly than a carpet. No one saw that coming.
Now, Clorox is in the cleaning products business so the results are obviously correct but that doesn't make them valuable. There is a big difference between picking up a grape from a reasonable floor versus a peanut butter sandwich that lands face down in a house with pets. If you drop a Twinkie, the long-term effects from the Twinkie are not the germs.
Did Clorox and the San Diego researchers examine how long Clorox bleach lasts on countertops after cleaning and can be transmitted to food? Errr, no, that would just be silly.
Hewitt KM, Gerba CP, Maxwell SL, Kelley ST (2012) Office Space Bacterial Abundance and Diversity in Three Metropolitan Areas. PLoS ONE 7(5): e37849. doi:10.1371/journal.pone.0037849
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Neil Tyson On The Politics Of Science Denial
- Global 'Roadmap' Shows Where To Put Roads Without Costing The Earth
- Corals: Not So Passive, They Are Nature's Tiny Engineers
- Synaptic Plasticity And Memory In Silent Neurons
- Low Carb Vs. Low Fat Diets: Which Is Better?
- Raloxifene: X-Ray Scattering Reveals A New Mode Of Action For Osteoporosis Drug
- Wockhardt Is First Indian Pharmaceutical Company To Get FDA QIDP Status
- "Helen,Indeed, you are right to be angry about such things. But I will only give two short..."
- "My Facebook Toxic Blue Green Algae Awareness Community webpage can now be found at https://www..."
- "That's why I deleted the comment Robert! I had just read an article about people beheading and..."
- "So ignore the data that shows the Antarctic breaking ice extent records. Ignore the water displacement..."
- "You don't think science media is a lot better about calling out anti-science on both political..."
- Clean air halves health costs in Chinese city
- Accounting for biological aggregation in heating and imaging of magnetic nanoparticles
- FAMOUS-NSTEMI -- diagnostic technique allows avoidance of surgery in one-fifth of heart attacks
- NOMI -- nitric oxide inhalation in heart attack patients sends mixed messages, but may offer benefit
- MITOCARE -- hopes dashed for an agent to prevent reperfusion injury