The Five-Second Rule: Bacteria Don't Wait That Long - Urban Legend #10

Send us Fan Mail Is the five-second rule real? A Rutgers study tested how fast bacteria move from floors to dropped food. Here's what the timing, the food and the surface actually change. ## What You'll Learn - The 5-Second Rule is an arbitrary phrase used to justify eating dropped snacks. Bacteria can transfer to food in under one second. - Longer contact time generally means more bacterial transfer. - Wet foods on smooth surfaces absorb more contamination than dry foods on carpet, so nobody's reflexes are fast enough to beat the microsecond reality of bacterial latching. ## Key Claims - Rutgers researchers measured bacterial transfer across four foods and four surfaces, with thousands of measurements. - Transfer can begin almost instantly, so five seconds is not a proven safety threshold. - Contact time, moisture and surface type all affect how much bacteria transfers. ## Sources - Dawson et al., Residence time and food contact time effects on transfer of Salmonella Typhimurium from tile, wood and carpet: testing the five-second rule - PubMed -  https://pubmed.ncbi.nlm.nih.gov/17381737/  —  - Miranda & Schaffner, Longer Contact Times Increase Cross-Contamination of Enterobacter aerogenes from Surfaces to Food - https://pmc.ncbi.nlm.nih.gov/articles/PMC5066366/ — Moisture and surface type affect transfer more than time alone (Peer-reviewed food microbiology review; food safety agency or academic extension guidance). Study design: four foods, four surfaces, four contact times, with measurement counts. - Rutgers Researchers Debunk ‘Five-Second Rule’: Eating Food off the Floor Isn’t Safe - https://www.rutgers.edu/news/rutgers-researchers-debunk-five-second-rule-eating-food-floor-isnt-safe — Bacteria can transfer in less than a second, and “under five seconds” is not a reliable safety threshold. It also gives the study’s memorable contrasts: wetter watermelon picked up more bacteria than gummy candy, while carpet generally transferred less than tile or stainless steel.  - Scientific American · https://www.scientificamerican.com/article/fact-or-fiction-the-5-second-rule-for-dropped-food/ - Explaining why the myth sounds plausible: longer contact can mean more transfer, so the rule contains a grain of truth—but that does not make the five-second cutoff safe. It contrasts Rutgers’ findings with earlier work, including an Aston University student study and research associated with Clemson and the University of Illinois.  Sound Effects via Floraphonic via Pixabay, Simmie SimSim and guest VO Artist Toots (my muse and co-conspirator; Don’t worry, I’m sure the Lake Patrol has no idea who you are…or do they?!) [11/10/26 - So, I was really thinking I was gonna skip doing this tonight. Then I spoke with my sister, Megs. She reminded me to be brave and bold and NOT to go to sleep. So, I did the recording, the editing, the artwork, etc. etc. all in one go. Never have I ever spat out an episode in about 4-5 hours total. And now, I must to sleep. Special thanks to Toots for her VO work. I love that you gave it a shot and that you were able to get another glimpse of what I have been/continue to do. Not as easy as you thought, but you stuck with it and hit the lines out of the park. Well done! I bet it’s the most popular of all the episodes I publish. ] Support the show If you have an idea for a topic, or some sort of impressive tip, trick or life hack that you MUST share, I want to hear about it. Please reach out to me at: [email protected]  Thank you for listening. Please SUBSCRIBE, FOLLOW, RATE and REVIEW wherever you listen (because that stuff may count. Who knew?!) https://www.linkedin.com/in/speakingofvo/ https://www.instagram.com/OhThatsAFact