This idea was nationally revealed after a Seinfeld episode aired many years ago, in which the character George Costanza was caught in the act of double-dipping. So now you're at a party. You grab a big crunchy taco chip and dip it into a dish salsa. Now you're left with half of a chip with no salsa on it. You look at the half eaten chip. You glance around the room to see if anyone is watching...
Before you give in to the temptation to double dip that chip, consider the findings of a study done by Prof. Paul L. Dawson, a food microbiologist at Clemson University, published in the Journal of Food Safety on the effect of pre-biting a chip on bacterial transfer to the dip, a.k.a. "double dipping". Eight volunteer "chip dippers" dipped chips and crackers into different dipping solutions three to six times. Half the dippers bit the chip once between dips, the others re dipped unbitten chips or crackers. Dips included cups of sterile water as well as commercial dips of different consistencies and with different common ingredients, like nacho cheese, chocolate, and salsa. Without question, double dipping significantly contaminated the dip with oral bacteria. After three dips of an unbitten chip or cracker there were fewer than 800 bacteria in the dip, after three dips by a pre bitten chip, the bacterial levels in the dip shot up to 500,000 per cup! Several factors contributed to just how much bacteria ended up in the dip. Higher acid dips inhibited bacteria initially, but after sitting for two hours the acidic dip was just as high in bacteria as the more neutral dips were. Dip viscosity also influenced bacteria transfer. Thicker, stickier dips meant that more of the dip that touched the bitten end of the chip stayed stuck to the chip, rather than remaining in the bowl.
So while we always knew double dipping at public gatherings is seriously anti-social and rude. We now can confirm it's quite unsanitary also. If you're the party host and have a shared chip bowl at your next gathering, here are a few tips to prevent double-dipping:
- Cut up foods into one-bite sized pieces so that guests will not get the urge to double-dip.
- Place the food into the center of the room rather than the corner so that guests will be less likely to double-dip.
- Provide a spoon for each dip, and small plates to encourage guests to portion out some dip onto their own separate plate.
The real truth is that most dips, store-bought or homemade already contain some bacteria. Double-dipping however will add significantly more microbes than the ones swimming in your salsa to begin with. So, if you wouldn't french kiss everyone at the party, keep an eye out for double dippers. If you want to avoid being embarrassed by getting publicly busted and want keep your germs to yourself, your best bet is to just double dip off of your own plate. The moral of the story, enjoy the parties but resist the urge, don't be a double dipper! Good Luck...
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