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SCIENCE

The Claim

The "five-second rule" — the belief that food dropped on the floor is safe to eat if picked up within five seconds — prevents the transfer of harmful bacteria to food.

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The Short Version

The five-second rule does not prevent harmful bacteria from transferring to dropped food. Peer-reviewed research, including a comprehensive 2016 Rutgers study, shows bacteria can transfer to food in less than one second upon contact. While longer contact times may increase contamination, there is no safe window. Factors like moisture, surface type, and contamination level often matter more than time. The claim is not supported by scientific evidence.

Caveats

  • Bacterial transfer begins immediately upon contact — picking food up quickly does not prevent contamination.
  • Moisture content, surface type, and existing contamination levels are often more important than contact time in determining bacterial transfer.
  • Some studies found no statistically significant difference in bacterial transfer between short and longer contact times, undermining the idea of any meaningful time-based cutoff.

The Receipts

  1. Determining the Potential Food Safety Risks Associated with Dropped Produce on Floor Surfaces in Grocery Stores - PubMed

    PubMed

  2. Is the 5-second rule true? Science finally has an answer.

    National Geographic

  3. Rutgers Researchers Debunk 'Five-Second Rule': Eating Food off the Floor Isn't Safe

    Rutgers Today

  4. The five-second rule: Fact or myth?

    The University of Alabama at Birmingham

  5. 'Five-Second Rule' Myth Debunked By Rutgers Researchers

    CBS News

  6. Longer Contact Times Increase Cross-Contamination of Enterobacter aerogenes from Surfaces to Food - PMC

    PMC

  7. Is the five-second rule true? Don't push your luck.

    Popular Science

  8. Five Second Rule [VIDEO] - Vanguard Cleaning Systems

    Vanguard Cleaning Systems

  9. Scientists agree: The 5-second rule isn't real - The Hustle

    The Hustle

  10. The Five-Second Rule: Debunking the Myth of Safe-to-Eat Dropped Food

    The Five-Second Rule: Debunking the Myth of Safe-to-Eat Dropped Food

+ 9 more sources — see the full list on Lenz

Filed Under

bacteriafive-second rulefood contaminationfood safety

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