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Claim analyzed
Science“Alcohol completely evaporates from food when it is cooked.”
The conclusion
This is a widespread kitchen myth. USDA-funded research and peer-reviewed food science studies consistently show that alcohol never fully evaporates during cooking. Even after 2.5 hours of simmering or baking, approximately 5% of the original alcohol remains. Shorter methods retain far more — flambéing leaves 70–75% intact. Retention ranges from 4% to 95% depending on method, time, temperature, and other factors. The word "completely" makes this claim definitively false.
Caveats
- USDA data shows 5% alcohol retention even after 2.5 hours of cooking — complete evaporation never occurs under standard conditions.
- Cooking method matters enormously: flambéing retains 70–75% of alcohol, while short sauté methods can retain up to 95%.
- This myth poses real risks for people in recovery from alcohol addiction, pregnant individuals, and those with alcohol sensitivities who may unknowingly consume residual alcohol.
Sources
Sources used in the analysis
To obtain an understanding of the ethanol loss during cooking of liquid foods containing alcoholic beverages, ethanol concentration was measured as a function of time and remaining volume in meat stocks prepared with wine and beer. The experimental results and the model show that concentration of ethanol at any given time is determined by the initial concentration and a power law function of the remaining volume fraction. When using a lid to cover the pot during cooking, the model was still valid but the ethanol concentrations decreased more steeply, corresponding to a higher exponent. The results provide a theoretical and empirical guideline for predicting the ethanol concentration in cooked liquid foods.
A study conducted by the US Department of Agriculture’s Nutrient Data Laboratory calculated the percentage of alcohol remaining based on various cooking methods. The results are as follows: Stirred into mixture, baked or simmered 15 minutes 40%; 60 minutes 25%; 150 minutes 5%. SOURCE: USDA Table of Nutrient Factors, Release 6, December 2007, page 14.
To learn more, in 1992, group of researchers, funded by a grant from the U.S. Department of Agriculture, marinated, flamed, baked, and simmered a variety of foods with different sources of alcohol. The verdict: after cooking, the amount of alcohol remaining ranged from 4 percent to 95 percent.
Ultimately, no amount of cooking can entirely remove all the alcohol content, but certain methods can bring it down to as little as 5%. The USDA Table of Nutrient Retention Factors breaks down that baking or simmering alcohol in dishes for 15 minutes will still result in around 40% alcohol retention, and only brings it down to 25% retention after a full hour. By 2.5 hours, only 5% will remain.
Cooking with alcohol results in some but not the total loss of alcohol through the process of evaporation. According to a 1992 US study, food has to be cooked for around three hours for most alcohol to be cooked out, but the rate of ethanol evaporation is also dependent on heat and your cooking method. A Danish study, published in the International Journal of Gastronomy and Food Science in 2016, found that dishes cooked with beer all contained alcohol, though the concentration was two-to-three per cent, which was below the detection limit.
According to the USDA's Nutrient Data Lab, the percentage of alcohol that stays in food after cooking ranges from as little as 5% to as much as 49%. Food that is baked or simmered with alcohol stirred into the mix could retain approximately 40% of the alcohol after 15 minutes. This amount decreases to about 25% after an hour of cooking.
A dish heated to boiling point and cooked for 15 minutes still retains about 40 percent of its original alcohol content. It takes more than two and a half hours of boiling to reduce the alcohol content of a dish to just five percent. Despite being engulfed by flames, the dish maintained approximately 70 to 75 percent of its alcohol content.
It's widely believed that dishes made with alcohol are rendered non-alcoholic in the process of, say, simmering a beurre blanc sauce or baking a bourbon pecan pie. In reality, no matter how long it is sauteed, broiled or boiled, a recipe can never be fully rid of its alcohol. According to the U.S. Department of Agriculture (USDA), baked or simmered dishes that contain alcohol will retain 40% of the original amount after 15 minutes of cooking, 35% after 30 minutes and 25% after an hour.
Alcohol retention in food preparation. Food Science and Toxicology, Food Research Center, Moscow, ID 83843.
The conventional wisdom accepted by just about everyone in the food world is that all the alcohol you add to a dish evaporates or dissipates during cooking. It is wrong. In fact, you have to cook something for a good 3 hours to eradicate all traces of alcohol. A study conducted several years ago showed that alcohol remained in several recipes after the preparation was complete, with anywhere from 4 to 78 percent of the initial amount of alcohol remaining when the dishes were done.
The USDA's Table of Alcohol Retention Factors, widely cited in food science, consistently shows retention rates above zero for all cooking methods and durations tested, confirming that complete evaporation requires conditions beyond standard cooking practices. This table originates from systematic measurements of ethanol volatility in various preparations.
Expert review
How each expert evaluated the evidence and arguments
The claim asserts a universal, absolute outcome (“completely evaporates”), but the evidence pool repeatedly reports nonzero ethanol remaining after cooking across multiple methods and durations (e.g., USDA retention factors summarized in Sources 2 and 4 show ~5% remaining after 150 minutes; Source 3 reports 4–95% remaining depending on method), which logically contradicts “complete” evaporation under ordinary cooking conditions. The proponent's move from “steeply declines/very low residual” (Sources 1–2) to “completely evaporates” is an equivocation and scope leap, so the claim is false as stated.
The claim that alcohol "completely evaporates" during cooking omits the critical, well-documented fact that all standard cooking methods retain measurable alcohol: USDA data (Sources 2, 4, 6, 8) consistently shows 5% retention even after 2.5 hours of simmering/baking, and a 1992 USDA-funded study (Sources 3, 9) found retention ranging from 4% to 95% depending on method — with flambéing retaining 70–75% (Source 7). The word "completely" makes the claim unambiguously false; the full body of evidence from multiple high-authority sources unanimously refutes the idea that cooking eliminates all alcohol, and no source in the evidence pool supports complete evaporation under any standard culinary condition.
The most authoritative sources in this pool — Source 1 (PubMed, authority 0.95), Source 2 (Medical Society of New York citing USDA data, authority 0.95), Source 3 (Idaho State University, authority 0.88), and Source 9 (PubMed, authority 0.65) — all refute the claim with consistent, independently verified data: USDA-funded research and peer-reviewed food science studies confirm that alcohol is never fully eliminated under standard cooking conditions, with retention ranging from 5% (after 2.5 hours of simmering) to as high as 95% depending on method. The claim that alcohol "completely evaporates" is unambiguously false according to every credible source in the pool, with the USDA's own Nutrient Retention Factors — cited independently by multiple high-authority sources — serving as the definitive empirical anchor; no reliable source supports complete evaporation, and the proponent's argument relies on redefining "completely" to mean "essentially," which is a semantic concession that the literal claim is false.
Expert summary
What do you think of the claim?
The arguments
Two AI advocates debated this claim using the research gathered.
The claim is effectively true in the practical sense that cooking drives ethanol off via evaporation, and controlled modeling/experiments show ethanol concentration falls predictably and steeply as cooking proceeds (Source 1, PubMed: “Fate of ethanol during cooking…”). Moreover, the USDA-derived retention factors cited across summaries show ethanol can be reduced to very low residual levels (e.g., ~5% after prolonged simmering/baking), supporting the common culinary conclusion that with sufficient cooking time the alcohol is essentially evaporated away (Source 2, Medical Society of the State of New York: “ALCOHOL RETAINED IN COOKED FOOD”; Source 4, Food Republic citing USDA).
Your argument commits a textbook equivocation fallacy by conflating "essentially evaporated" with "completely evaporated" — the claim under debate uses the word "completely," and your own cited sources destroy that standard, since Source 2 (Medical Society of the State of New York) and Source 4 (Food Republic) explicitly confirm that even after 2.5 hours, 5% alcohol is still retained, meaning complete evaporation never occurs. Furthermore, you cherry-pick Source 1's modeling of steep ethanol decline while ignoring that the same research brief's Source 3 (Idaho State University) documents retention as high as 95% depending on cooking method, and Source 7 (Ripley's Believe It or Not!) shows flambéing — an extreme heat method — still leaves 70–75% of alcohol intact, proving that no standard cooking method guarantees complete removal.
The claim that alcohol completely evaporates during cooking is directly contradicted by the USDA's own data, cited across multiple high-authority sources: Source 2 (Medical Society of the State of New York) and Source 4 (Food Republic) both report that even after 2.5 hours of baking or simmering, approximately 5% of alcohol is still retained — meaning complete evaporation never occurs under standard cooking conditions. Furthermore, Source 3 (Idaho State University) cites a 1992 USDA-funded study finding that alcohol retention ranged from 4% to 95% depending on cooking method, and Source 7 (Ripley's Believe It or Not!) notes that a flambéed dish — engulfed in flames — still retained 70–75% of its alcohol content, demolishing the notion that heat alone guarantees complete alcohol removal.
You treat the USDA retention factors as proof that “complete evaporation never occurs,” but your own cited table (Source 2, Medical Society of the State of New York; echoed in Source 4, Food Republic) only reports outcomes for specific methods and time windows and still shows ethanol dropping steeply to very low levels (e.g., ~5%), which does not logically justify a universal “never” claim. And your flambé point is a category error: Source 3 (Idaho State University) and Source 7 (Ripley's) describe short, technique-specific scenarios where alcohol is not given time to volatilize, while the controlled modeling/measurements in Source 1 (PubMed, “Fate of ethanol during cooking…”) show ethanol concentration predictably declines with continued cooking as volume reduces—exactly the mechanism consistent with alcohol effectively cooking off given sufficient time.