Who hasn't picked up a dropped crisp or lettuce leaf, given it a quick blow, and popped it in their mouth? A Rutgers University study, published in Applied and Environmental Microbiology, challenges the popular 5-second rule. This myth suggests food is safe to eat if picked up within five seconds. In reality, bacterial contamination happens almost instantly.
Researchers tested four surfaces and four foods: melon, bread, buttered bread, and gummy candy. Contact times ranged from less than one second to five minutes (300 seconds). They measured transfer of Enterobacter aerogenes bacteria, similar to salmonella. Key findings: Melon contaminated fastest, while gummy candy resisted best. All foods picked up bacteria regardless of time, but shorter contact meant less transfer. The 5-second rule isn't entirely baseless—less time reduces bacterial load—but contamination still occurs. Other studies confirm surfaces matter: Carpets transfer fewer bacteria than wood.
Next time you're tempted, remember: Candy on carpet beats melon on parquet, but skipping it altogether is safest.
