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2. The Dangers of Double-Dipping.
It’s generally agreed upon that you should not re-dip a chip or cookie back in a condiment after you have taken a bite. After all, if sharing drink can spread germs, it’s just common sense that double-dipping can spread germs as well.
Dr. Dawson and his team ran an experiment on this as well. Not surprisingly, testing various sauces and dips after someone had double-dipped in them found that there were higher levels of bacteria. However, the type of dip was major factor in determining how much bacteria was present.
The highest levels were found in salsa, and the reason is simpler than you might think. Salsa is much more likely to fall off the chip back into the bowl than other dips, like melted cheese, chocolate, etc.
The bottom line: Again, this is something you just shouldn’t do. Not just because it is a social faux pax, but because it can indeed spread your oral bacteria to other people, even though the type of dip is a significant factor.
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3. Birthday Bacteria.
This last one is pretty obvious, though many people would never think of it. Blowing out birthday candles can spread airborne germs onto the cake, which in turn can infect people who eat that cake. It’s really no different than coughing on something.
Dr. Dawson’s team found that a cake which had blown-out candles had bacteria levels almost 15 times higher than a cake that was not blown on.
Does this mean you should abandon the tradition of blowing out birthday candles? Not so fast. There’s no real risk if you or the person blowing are not sick. Everybody’s mouth has bacteria, and it is not something to be concerned about unless you are actually under the weather.
The bottom line: Blowing out birthday candles is fine, as long as the person doing the blowing is healthy.
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