I read a letter to Dear Abby from someone who had served cupcakes made with Kahlua liqueur. Abby said enough alcohol remained to affect someone with alcohol sensitivity. In my opinion, the woman claiming to be drunk from a cupcake was just trying to get attention. How much alcohol is there in spiked cupcakes? How many people are so hypersensitive that one cupcake would make them drunk? Finally, what products would those people need to avoid? - Charlie in Alabama
First the facts. According to the Dear Abby letter, the recipe called for half a cup of Kahlua and yielded 30 cupcakes. Kahlua is 40 proof, so a half cup contains 0.8 ounces of alcohol-about one and a quarter beers' worth. Even if all the alcohol remained after baking, you'd have to eat two dozen cupcakes to get the equivalent of one beer. Would the average person then be drunk? No, the average person would then be sick from all those fricking cupcakes.
The next question is how much alcohol burns off in the oven. We identified two ways of getting at this.
The first is via the U.S. Department of Agriculture, which tests foods and beverages to find out how many nutrients are lost during cooking. (Yes, the USDA considers alcohol a nutrient.) According to the USDA, an open alcoholic beverage sitting out overnight will lose 30 percent of its alcohol content to evaporation. Stirring whiskey into coffee removes about 15 percent of the alcohol in it, and liqueur used to make a flambé such as crepes Suzette loses about 25 percent. Baking or simmering an alcoholic beverage for 15 minutes vaporizes 60 percent of the alcohol; it takes two and a half hours of cooking to reduce the alcohol content by 95 percent.
My assistants Una and Fierra obtained saliva-activated blood alcohol measuring strips and proceeded:
1. As a control, they tested their blood alcohol concentration (BAC) while stone sober: 0.00 percent.
2. Next they each consumed one True Blonde Ale, alcohol content 5.3 percent by volume, from Ska Brewing Company, proud sponsor of the Straight Dope podcast. Their BAC subsequently tested at 0.04 percent.
3. The two then made 36 cupcakes using a recipe calling for three quarters of a cup of Kahlua, plus another quarter cup for the frosting. They calculated that the batter and frosting together should contain at most 1.8 percent alcohol by weight. Based on the ale phase of the experiment, they hypothesized that eating three cupcakes at a sitting, even if no alcohol were lost due to evaporation or cooking, would produce at most a BAC of just under 0.01 percent.
4. Six trials were conducted over a two-day period. Each trial consisted of eating three cupcakes and testing BAC an hour later. Results: no trace of alcohol in either experimenter at any point.
5. Meanwhile, the cupcakes themselves were tested for alcohol content. The USDA research led us to believe about 46 percent of the original alcohol would remain. Samples of the cake and frosting were mixed with just enough water to make a paste and applied to the BAC strips. The frosting registered 0.04 percent, the cake roughly 0.30 percent. So the cupcakes had some residual alcohol in them, but seemingly not much.
Is there such a thing as hypersensitivity to alcohol? Yes, but that doesn't mean very small amounts make you drunk. Many east Asians suffer from an enzyme deficiency that inhibits their ability to metabolize an alcohol by-product called acetaldehyde. Drinking can result in "Asian flush," characterized by a flushed face and sometimes a racing pulse and vomiting-hardly drunkenness in the usual sense. What's more, the trigger amount is on the order of half a beer, far more than from a spiked cupcake.
Further perusing the literature, we find accounts of alcohol-induced anaphylactic shock, essentially a severe allergic reaction. The most common symptom is hives, but others include dizziness, slurred speech, nausea, wheezing, diarrhea, and abdominal pain. My guess: if you experience all this, you don't think you're drunk, you think you're going to die.
Still, it's conceivable the supposedly tipsy coworker had a mild allergic reaction. But it's more likely, I'd say, that her cupcake issues were all in her head.
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