You can’t completely prevent a hangover if you’re drinking enough alcohol to get one, but you can significantly reduce how rough the next morning feels. The strategies that actually work target the specific biological processes that cause hangover symptoms: dehydration, a toxic byproduct called acetaldehyde building up in your body, disrupted sleep, and inflammation. Here’s what to do before, during, and after drinking.
Why Hangovers Happen in the First Place
When your liver processes alcohol, it first converts it into acetaldehyde, a compound that’s significantly more toxic than alcohol itself. A second enzyme then breaks acetaldehyde down into harmless acetic acid. The problem is that this second step can’t always keep up with the first, especially when you’re drinking faster than your liver can work. The resulting buildup of acetaldehyde causes nausea, facial flushing, drowsiness, and cardiovascular stress.
At the same time, alcohol suppresses the release of a hormone that tells your kidneys to retain water. You urinate more, lose electrolytes, and end up dehydrated. Alcohol also triggers an inflammatory response throughout your body, which contributes to headache, brain fog, and that general “hit by a truck” feeling. Every effective prevention strategy targets one or more of these mechanisms.
Eat Before and While You Drink
Food in your stomach slows the rate at which alcohol enters your bloodstream. This gives your liver more time to process each drink before the next wave arrives, reducing the acetaldehyde pileup that drives the worst symptoms. A meal with fat, protein, and complex carbohydrates works best because it takes longer to digest, keeping that buffer in place for hours.
Eating before drinking is the single most impactful thing you can do. A full stomach can reduce your peak blood alcohol concentration by roughly a third compared to drinking on an empty stomach. Snacking while you drink extends the benefit. Greasy bar food gets a bad reputation in health contexts, but in this narrow scenario, the fat content genuinely helps slow alcohol absorption.
Pace Your Drinks and Hydrate Between Them
Your liver processes roughly one standard drink per hour. Anything beyond that creates a backlog. The most straightforward prevention strategy is keeping your intake close to that rate. One practical approach: alternate every alcoholic drink with a full glass of water. This forces a slower pace and directly counteracts alcohol’s dehydrating effect.
Dehydration alone doesn’t explain the full hangover experience, but it drives the headache, dry mouth, and dizziness components. Adding electrolytes (through a sports drink, coconut water, or an electrolyte packet) before bed helps your body rehydrate more effectively than plain water, since alcohol depletes sodium and potassium along with fluids.
Choose Lighter-Colored Drinks
Congeners are chemical byproducts of fermentation and aging that give darker spirits their color and flavor. They also make hangovers worse. Bourbon, brandy, and dark rum contain dramatically more congeners than vodka or gin. Bourbon, for example, contains isobutanol concentrations of 400 to 600 mg/mL, while lighter spirits have far lower levels. Red wine also carries a heavier congener load than white wine.
This doesn’t mean clear spirits are hangover-proof. Alcohol itself is the primary cause of hangovers regardless of what you’re drinking. But if you’re choosing between two drinks and hangover prevention is on your mind, a vodka soda will typically treat you better the next morning than a whiskey neat. Cheap liquor also tends to be less thoroughly distilled, meaning more congeners survive the process.
Protect Your Sleep
Alcohol is one of the worst things you can do to your sleep quality, even though it makes you feel drowsy. In the first half of the night, alcohol sedates you into deep sleep while suppressing REM sleep, the stage critical for emotional regulation and memory. Then, as your body metabolizes the alcohol, the second half of the night becomes a mess. Your sympathetic nervous system kicks into gear, your sleep fragments, and you experience a REM rebound that produces vivid, often unpleasant dreams and frequent waking.
This disrupted sleep architecture is a major reason hangovers feel so awful. You may have been in bed for eight hours but gotten the equivalent of four hours of restorative sleep. The practical fix is to stop drinking earlier in the evening. Giving your body two to three hours between your last drink and bedtime allows your liver to clear a meaningful amount of alcohol before you fall asleep, reducing the severity of that second-half rebound. Sleeping in a cool, dark room and keeping water by the bed also helps you get more out of whatever sleep you do get.
Supplements That Show Some Promise
The hangover supplement market is enormous, and most products rely on weak or nonexistent evidence. A few ingredients, however, have shown real effects in human studies.
Dihydromyricetin (DHM), a compound extracted from the Japanese raisin tree, is the most studied. It appears to support alcohol metabolism by enhancing cellular energy pathways in the liver, helping your body clear acetaldehyde more efficiently. Clinical trials are currently testing doses ranging from 300 mg to 900 mg, sometimes combined with the amino acid L-lysine. DHM is available over the counter in many hangover supplements, though the optimal dose for hangover prevention isn’t yet settled.
Hovenia dulcis extract (from the same Japanese raisin tree family) has been tested in human trials and shown to significantly reduce gastrointestinal hangover symptoms like nausea and stomach discomfort compared to placebo. Some formulations combine it with kudzu root extract and glutathione-enriched yeast, which may enhance the effect.
B vitamins and zinc are sometimes recommended because alcohol depletes both. Taking a B-complex vitamin before bed won’t hurt, but the evidence for a noticeable hangover reduction is thin. The same goes for activated charcoal, which doesn’t bind alcohol effectively and is unlikely to help.
What Doesn’t Work
“Hair of the dog,” or drinking more alcohol the next morning, delays a hangover rather than preventing it. You’re simply restarting the cycle. Your body still has to process every molecule of alcohol eventually.
Coffee the next morning helps with the fatigue and headache (caffeine is a vasoconstrictor that counteracts alcohol’s vasodilation), but it further dehydrates you and doesn’t address the underlying inflammation or acetaldehyde damage. If you drink coffee, pair it with water and food.
There’s also no evidence that mixing different types of alcohol (“beer before liquor”) affects hangover severity. Total alcohol consumed and the rate you consume it are what matter. The old rhymes are just rhymes.
A Realistic Prevention Checklist
- Before drinking: Eat a full meal with fat and protein. Take DHM or Hovenia dulcis extract if you have it.
- While drinking: Alternate alcoholic drinks with water. Stick to one drink per hour. Choose lighter-colored spirits or white wine over dark liquor and red wine.
- Before bed: Drink a large glass of water with electrolytes. Eat a small snack. Allow at least two hours between your last drink and sleep.
- General rule: Keep your total intake moderate. No strategy fully compensates for heavy drinking. The dose-response relationship between alcohol consumed and hangover severity is steep, meaning the difference between four and six drinks is far larger than the difference between two and four.