The next time you blow out the candles on a birthday cake, you may want to wish for a strong immune system.

A study published in the Journal of Food Research found that blowing out birthday cake candles left behind 1400 percent more bacteria on the cake's frosting than if candles were not blown out on the cake.

The study suggests that those with health concerns may want to take safety measures when engaging in the birthday cake tradition.

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Passengers wait at a Delta check-in counter at Hartsfield-Jackson Atlanta International Airport on Friday, Nov. 7, 2025. It was the first day the Federal Aviation Administration cut flight capacity at airports during the government shutdown. (Arvin Temkar/AJC)

Credit: arvin.temkar@ajc.com