Diet Soda Mixers Up Breathalyzer Readings

People who drank vodka with a diet mixer had breath alcohol levels 18 percent higher than when they drank alcohol with full-calorie soda. Sophie Bushwick reports

Join Our Community of Science Lovers!

Diet soda may help or hinder attempts to lose weight. But it definitely can get you drunker. Because a drink made from alcohol and a diet mixer boosts breathalyzer readings higher than the same drink with a sugary mixer. The finding is in the journal Alcoholism: Clinical & Experimental Research. [Cecile A. Marczinski and Amy L. Stamates, Artificial sweeteners versus regular mixers increase breath alcohol concentrations in male and female social drinkers]

For the study, 16 casual drinkers knocked back one of three drinks: vodka mixed with sugary soda, vodka mixed with sugar-free soda, or a placebo. Over three different sessions, each participant got each drink. After the drink, the subjects were given breathalyzer tests and reaction time measurements. Participants also did a self-assessment where they estimated their own drunkenness, tiredness and willingness to drive.

When both men and women drank vodka with the diet mixer, their breath alcohol levels were on average 18 percent higher than when they consumed the alcohol with full-calorie soda. And their reaction times were slower.


On supporting science journalism

If you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.


Although a diet mixer impaired the subjects more, they rated themselves as not being any drunker. So if you're watching your weight, watch out for what you drink.

—Sophie Bushwick

[The above text is a transcript of this podcast.]

Sophie Bushwick was formerly the technology editor at Scientific American. She makes frequent appearances on radio shows such as Science Friday and television networks, including CBS, MSNBC and National Geographic. She has more than a decade of experience as a science journalist based in New York City and previously worked at outlets such as Popular Science,Discover and Gizmodo. Follow Bushwick on X (formerly Twitter) @sophiebushwick

More by Sophie Bushwick

It’s Time to Stand Up for Science

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in that two-century history.

I’ve been a Scientific American subscriber since I was 12 years old, and it helped shape the way I look at the world. SciAm always educates and delights me, and inspires a sense of awe for our vast, beautiful universe. I hope it does that for you, too.

If you subscribe to Scientific American, you help ensure that our coverage is centered on meaningful research and discovery; that we have the resources to report on the decisions that threaten labs across the U.S.; and that we support both budding and working scientists at a time when the value of science itself too often goes unrecognized.

In return, you get essential news, captivating podcasts, brilliant infographics, can't-miss newsletters, must-watch videos, challenging games, and the science world's best writing and reporting. You can even gift someone a subscription.

There has never been a more important time for us to stand up and show why science matters. I hope you’ll support us in that mission.

Thank you,

David M. Ewalt, Editor in Chief, Scientific American

Subscribe