Bourbon Has 37 Times the Hangover Compounds of Vodka

A bourbon hangover really is worse than a vodka one, and researchers have put a number on why: bourbon contains roughly 37 times the congeners of vodka. Both are typically 80 proof, so the difference isn’t the alcohol content on the label. It’s everything else in the bottle. That said, congeners are the second-biggest factor in how you feel tomorrow. The first is still how much total alcohol you drank, and most people misjudge that part badly.

A Standard Drink Is the Same Whether It’s Beer, Wine or Liquor

This is the piece most people miss. In the United States, a standard drink is any drink containing about 14 grams, or 0.6 fluid ounces, of pure alcohol. That’s the amount in 12 ounces of regular 5% beer, 5 ounces of 12% table wine, or 1.5 ounces of 80-proof distilled spirits.

Those three servings are equivalent. A shot of vodka and a can of beer put roughly the same amount of ethanol into your body. So the idea that liquor is inherently worse than beer doesn’t hold up once you account for serving size.

Where it gets tricky is that real drinks don’t always match those reference sizes. A 12-ounce craft beer at 10% ABV is two standard drinks, not one. A generously poured cocktail can easily be two or three. That mismatch is usually what’s behind a worse-than-expected morning, not the category of alcohol you chose.

Proof Is Simply Double the ABV

The old measurement people reference is straightforward. In the U.S., proof equals twice the alcohol by volume. An 80-proof bottle is 40% alcohol. A 100-proof bottle is 50%.

Higher proof doesn’t create a worse hangover on its own. What it does is make it much easier to drink more alcohol without noticing, because the same volume of liquid carries more ethanol. Pour size becomes the variable that matters.

Congeners Explain Why Dark Liquor Hits Harder

Beyond ethanol, alcoholic beverages contain congeners, which are compounds other than ethyl alcohol produced during fermentation and aging. They include acetone, acetaldehyde, fusel oils, tannins, and furfural, and they’re partly responsible for a drink’s color.

Researchers at Brown University tested the bourbon-versus-vodka question directly, having participants drink to a matched breath alcohol concentration on bourbon one night and vodka another. People reported worse hangovers after bourbon.

Roughly ordered from fewer congeners to more:

• Vodka, gin, white rum
• Beer
• White wine
• Red wine
• Whiskey, bourbon, dark rum
• Brandy

Two caveats worth holding onto. The same study found no difference in next-day cognitive performance between the two spirits, so congeners affected how bad people felt but not how well they functioned. And total ethanol still had a considerably stronger effect on hangover than congener content did. Switching to vodka doesn’t help if the lower harshness just leads you to drink more of it.

Food Slows Alcohol Absorption, It Doesn’t Soak It Up

There’s a persistent myth that food absorbs alcohol in your stomach. It doesn’t work that way.

What food actually does is slow gastric emptying. Alcohol is absorbed fastest in the small intestine, and a meal keeps the pyloric valve closed longer, so alcohol reaches that point gradually instead of all at once. The result is a slower, lower peak blood alcohol concentration. Fat slows emptying the most, followed by protein, then carbohydrates.

There’s a second effect too. The stomach lining contains an enzyme called gastric alcohol dehydrogenase that begins breaking alcohol down before it reaches the bloodstream. The longer alcohol stays in the stomach, the more of this first-pass metabolism happens.

Carbonation works in the opposite direction. It increases pressure in the stomach, pushes the valve open sooner and speeds absorption, which is one reason sparkling drinks can feel like they hit faster.

Your Body Chemistry Changes the Equation

Two people drinking identically can wake up feeling very different, and the reasons are physiological rather than a matter of willpower or experience.

Ethanol distributes through body water, not fat. Someone with a higher proportion of body water dilutes the same dose more effectively. On average, women have a lower total body water volume and lower gastric alcohol dehydrogenase levels than men of similar weight, which means more alcohol reaches the bloodstream intact. Genetics play a role as well, particularly variations in the enzymes that clear acetaldehyde.

What’s Actually Happening the Next Morning

A hangover isn’t one process. Several things overlap.

Your liver converts alcohol into acetaldehyde, a toxic, short-lived byproduct that contributes to inflammation in the liver, pancreas, brain and gastrointestinal tract. Alcohol also suppresses vasopressin, which increases urine output and drives dehydration. It disrupts sleep architecture, reducing REM sleep and increasing wake time, which is why you can sleep eight hours and still feel wrecked. And it triggers an inflammatory response similar to the malaise you feel when you’re sick.

Typical symptoms include fatigue, thirst, headache, muscle aches, nausea, stomach pain, vertigo, light and sound sensitivity, anxiety, irritability and elevated blood pressure.

No Hangover Cure Exists

This is worth stating plainly, because the internet suggests otherwise. According to the National Institute on Alcohol Abuse and Alcoholism, no hangover remedy has been scientifically proven effective. Only time helps. Your body has to finish clearing the byproducts of alcohol metabolism, rehydrate, heal irritated tissue and return immune and brain activity to normal.

Things that do not speed that up:

• Coffee, which may increase alertness but does nothing to clear alcohol
• Cold showers
• A drink the next morning, which can prolong the symptoms rather than end them
• Supplements and detox shots marketed as cures

What supportive care can do is make the wait more tolerable. Fluids address the dehydration driving the headache and fatigue. Bland food helps an irritated stomach. Rest matters.

One safety note on pain relievers. Acetaminophen combined with alcohol carries a risk of liver toxicity, which is a real concern given that it’s often the reflexive choice. Anti-inflammatories like ibuprofen are generally preferred in that situation, though they can irritate the stomach lining, which alcohol has already aggravated. If you take medication regularly, it’s worth asking a pharmacist or doctor what’s appropriate for you.

Signs That Go Beyond a Hangover

Some symptoms indicate alcohol poisoning rather than a rough morning, and they need emergency medical attention: confusion, difficulty staying conscious, vomiting while unresponsive, seizures, slow or irregular breathing, and pale or bluish skin from low body temperature. These are medical emergencies, and someone in that state should not be left to sleep it off.

The Practical Takeaway

Pacing and total volume matter more than what’s in your glass. Eating beforehand lowers your peak blood alcohol concentration. Choosing lower-congener spirits may soften the next morning slightly, but only if it doesn’t lead to drinking more. And the only reliable way to avoid a hangover is to not drink enough to get one.

Source: National Institute on Alcohol Abuse and Alcoholism