Part of our Asian Flush & Alcohol guide library.
Short answer: Not in the simple way the saying suggests. A night of drinking does not wipe out a batch of brain cells, and one classic study found the same number of neurons in the outer brain of long-term heavy drinkers as in non-drinkers. But alcohol does change the brain. Long-term heavy drinking shrinks neurons and damages white matter, the wiring that connects brain areas, and large studies link even moderate drinking to smaller brain volume. Some of that damage can improve after people stop drinking, but not all of it.
"Every drink kills brain cells" is one of the most familiar lines about alcohol. The real picture is less dramatic for an occasional drink and more serious for heavy, long-term drinking. Here is what the research shows about neurons, brain volume, memory and blackouts, what can recover, and when it is time to talk to a doctor.
What you'll learn
- Whether alcohol actually kills brain cells, and what the "every drink" myth gets wrong
- What long-term drinking does to brain volume and white matter
- How moderate drinking compares with heavy drinking in brain scans
- What blackouts, alcohol overdose and vitamin B1 deficiency do to the brain
- How much of the damage can recover after you stop drinking
Does alcohol kill brain cells?
Not directly, in most cases. When researchers counted neurons in the neocortex, the brain's outer layer, of 11 men with long-term alcohol use disorder and 11 matched men without it, the totals were nearly identical: about 23.4 billion and 23.2 billion. What the drinkers had lost was white matter, about 11% less relative to brain weight, plus 30% less tissue in the archicortex, an older brain region that includes memory structures (Jensen and Pakkenberg, 1993).
That does not mean alcohol is harmless to brain cells. Long-term heavy drinking makes neurons shrink (NIAAA), and some loss of neurons in specific regions may be permanent (Zahr and Pfefferbaum, 2017). Severe vitamin B1 deficiency, which is common in people with alcohol use disorder, can permanently damage memory areas of the brain (MedlinePlus).
Does alcohol kill brain cells every time you drink?
There is no evidence that a single drink or a single night out kills a measurable number of brain cells. Alcohol does affect the brain right away: it interferes with the brain's communication pathways, which is why balance, speech, memory and judgment get worse as you drink (NIAAA). Those effects wear off as alcohol leaves your body. For how long that takes, see how long alcohol stays in your system.
The bigger risks are heavy drinking in one sitting, which can cause blackouts or alcohol overdose, and heavy drinking over months and years (NIAAA).
What does long-term drinking do to your brain?
It changes both the size and the wiring of the brain. Imaging studies show that white matter is especially vulnerable to long-term heavy drinking, and some grey matter structures are damaged too (Zahr and Pfefferbaum, 2017). Here is how the main findings compare:
| What researchers measured | What they found | Who was studied |
|---|---|---|
| Number of neurons in the neocortex | No difference; white matter and archicortex were smaller | 22 men, brain tissue after death (Jensen and Pakkenberg, 1993) |
| Neuron size | Neurons shrink with long-term heavy drinking | NIAAA summary (NIAAA) |
| Hippocampus (memory center) | More shrinkage the more people drank over 30 years | 527 adults in the UK (Topiwala et al., 2017) |
| Total brain volume | Smaller with more drinking, starting at 1 to 2 UK units a day | 36,678 adults in the UK (Daviet et al., 2022) |
| Dementia risk | Alcohol use disorders were the strongest modifiable risk factor for dementia | Hospital records across France (Schwarzinger et al., 2018) |
In the French study, more than half of early-onset dementia cases, which start before age 65, were either alcohol-related by definition (38.9%) or came with an alcohol use disorder diagnosis (17.6%) (Schwarzinger et al., 2018).
Does moderate drinking shrink your brain?
Large observational studies suggest it may. In a UK study that followed 527 adults for 30 years, people who drank 14 to 21 UK units a week had about three times the odds of shrinkage in the right hippocampus compared with people who did not drink, and light drinking showed no protective effect (Topiwala et al., 2017). A UK unit is 8 grams of alcohol, so 14 to 21 units is 112 to 168 grams, or about 8 to 12 US standard drinks a week, by our calculation (NIAAA).
In 36,678 middle-aged and older adults, lower brain volume was already visible at 1 to 2 UK units a day, and the link grew stronger with more drinking (Daviet et al., 2022). That is about 0.6 to 1.1 US standard drinks a day, by our calculation. Both studies are observational, so they show a link, not proof that alcohol caused the change, and the authors of the larger study note that their design cannot identify causal effects (Daviet et al., 2022).
Can alcohol cause permanent brain damage?
Yes, in some situations. These are the ones with the clearest evidence:
- Alcohol overdose. When so much alcohol is in the blood that brain areas controlling breathing, heart rate and temperature begin to shut down, the result can be permanent brain damage or death (NIAAA).
- Wernicke-Korsakoff syndrome. A lack of vitamin B1 (thiamine), common in alcohol use disorder, can damage the brain. Korsakoff syndrome results from permanent damage to memory areas, and vitamin B1 treatment often does not restore lost memory (MedlinePlus).
- Long-term heavy drinking. Some brain damage, such as loss of neurons, may not reverse even after long periods without alcohol (Zahr and Pfefferbaum, 2017).
Signs of alcohol overdose include confusion, trouble staying conscious, vomiting, seizures, trouble breathing, a slow heart rate and very low body temperature (NIAAA). If you see them, call 911.
Can your brain recover after you stop drinking?
Partly, for many people. NIAAA notes that a growing number of studies show at least some alcohol-related brain changes, and the changes in thinking and mood that come with them, can improve and possibly reverse with months of abstinence (NIAAA).
Brain scans of people in recovery show the fluid-filled spaces in the brain getting smaller and the cerebral cortex regaining volume. Some recovery shows up after about 6 weeks without alcohol, although brain volume does not fully match people who never drank heavily. Older people seem to recover less than younger people, some white matter problems persist after 6 to 30 months, and lost neurons may not come back (Zahr and Pfefferbaum, 2017). The authors of the neuron-counting study suggested that because the cell bodies were still there, lost connections might be rebuilt with long-term abstinence (Jensen and Pakkenberg, 1993).
Is blacking out a sign of brain damage?
A blackout is a memory gap, not proof of lasting damage, but it is a warning sign. During a blackout, enough alcohol is in your system to temporarily block the transfer of memories from short-term to long-term storage in the hippocampus (NIAAA). You are still awake, but your brain is not recording new memories. Blackouts are more likely when you drink on an empty stomach, drink quickly or binge drink (NIAAA).
NIAAA says even one blackout is a reason to think about your drinking and talk to a health care provider (NIAAA). If drinking leaves you foggy the next day, see how long a hangover lasts.
How can you protect your brain if you drink?
Drinking less is the most direct step. The brain findings above get stronger as drinking increases (Daviet et al., 2022) (Topiwala et al., 2017). Practical ways to cut back:
- Count standard drinks. One US standard drink has 14 grams of alcohol, and a 12-ounce craft beer at 10% alcohol counts as two (NIAAA). See how much alcohol is in wine.
- Slow down and eat first. Drinking quickly or on an empty stomach makes blood alcohol rise faster, which raises the odds of a blackout (NIAAA).
- Swap in alcohol-free rounds. Try a few of our easy mocktail recipes.
- Eat a varied diet. Good nutrition lowers the risk of vitamin B1 deficiency, but it does not replace cutting back on alcohol (MedlinePlus).
If you take medicines for sleep or anxiety, ask your doctor or pharmacist about alcohol, since they make blackouts more likely (NIAAA).
When should you talk to a doctor about alcohol and your brain?
Talk to a health care provider if you have had a blackout, if you notice memory problems, or if you find it hard to cut back (NIAAA). Get medical help right away for confusion, trouble walking or keeping your balance, or unusual eye movements or double vision in someone who drinks heavily, since these can be signs of Wernicke encephalopathy, which needs urgent treatment (MedlinePlus). If you have been drinking heavily and often, talk with a provider before you stop, because moderate to severe alcohol withdrawal may need treatment in a hospital, and its severe form can cause seizures and sudden confusion (MedlinePlus).
Common myths (quick reality check)
Myth: Every drink kills thousands of brain cells. Reality: No study has shown this. In a neuron-counting study, long-term heavy drinkers had about the same number of neocortical neurons as non-drinkers, but less white matter (Jensen and Pakkenberg, 1993).
Myth: If alcohol does not kill brain cells, it does not hurt your brain. Reality: Long-term heavy drinking shrinks neurons and damages white matter (NIAAA) (Zahr and Pfefferbaum, 2017), and larger studies link more drinking to smaller brain volume (Daviet et al., 2022).
Myth: A little wine protects your brain. Reality: In a 30-year UK study, light drinking showed no protective effect on the brain compared with not drinking (Topiwala et al., 2017).
Frequently asked questions (FAQ)
Does alcohol kill brain cells permanently?
Usually alcohol does not kill neurons outright, but long-term heavy drinking can cause damage that does not fully reverse, including some loss of neurons and lasting memory damage from vitamin B1 deficiency.
Is "alcohol kills brain cells" true or false?
Mostly false as stated. Alcohol shrinks neurons and damages the white matter that connects them, rather than killing large numbers of brain cells.
How much alcohol damages the brain?
Research has not pinned down a safe amount for the brain. Brain scan studies link drinking to smaller brain volume starting at about 1 to 2 UK units a day, and the link grows stronger with more drinking.
Does binge drinking damage the brain?
Binge drinking raises the risk of blackouts and alcohol overdose, and an overdose can cause permanent brain damage. Blackouts are more likely when you drink quickly or on an empty stomach.
Can brain cells grow back after drinking?
Lost neurons may not come back, but brain volume and some white matter can recover with months of abstinence, especially in younger people.
Does a hangover mean brain cells died?
No. A hangover reflects the short-term effects of drinking, such as mild dehydration and stomach irritation, not lost brain cells.
Is beer or liquor worse for your brain?
The research links brain changes to how much alcohol people drink, not to the type of drink. Counting standard drinks is more useful than comparing beer, wine and liquor.
Related guides
- Is alcohol a stimulant or a depressant?
- How long does alcohol stay in your system?
- How to sober up
- How long does a hangover last?
- Why do I get diarrhea after drinking?
- Is alcohol a blood thinner?
- Alcohol and liver disease
- Why do Asians get Asian flush?
Disclaimer and when to seek help
This article is for general education and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. Our products are not intended to diagnose, treat, cure, or prevent any disease. If you have memory problems, have had a blackout, or are concerned about your drinking, talk to your health care provider. If you drink heavily and often, talk with a provider before you stop. Call 911 for signs of alcohol overdose.
References
- Jensen GB, Pakkenberg B. "Do alcoholics drink their neurons away?" The Lancet, 1993;342(8881):1201-1204. doi:10.1016/0140-6736(93)92185-V
- Topiwala A, et al. "Moderate alcohol consumption as risk factor for adverse brain outcomes and cognitive decline: longitudinal cohort study." BMJ, 2017;357:j2353. PMC5460586
- Daviet R, et al. "Associations between alcohol consumption and gray and white matter volumes in the UK Biobank." Nature Communications, 2022;13:1175. PMC8897479
- Zahr NM, Pfefferbaum A. "Alcohol's effects on the brain: neuroimaging results in humans and animal models." Alcohol Research: Current Reviews, 2017;38(2):183-206. PMC5513685
- Schwarzinger M, et al. "Contribution of alcohol use disorders to the burden of dementia in France 2008-13: a nationwide retrospective cohort study." The Lancet Public Health, 2018;3(3):e124-e132. doi:10.1016/S2468-2667(18)30022-7
- National Institute on Alcohol Abuse and Alcoholism. "Alcohol and the Brain: An Overview"
- National Institute on Alcohol Abuse and Alcoholism. "Interrupted Memories: Alcohol-Induced Blackouts"
- MedlinePlus Medical Encyclopedia. "Wernicke-Korsakoff syndrome"
- National Institute on Alcohol Abuse and Alcoholism. "What Is A Standard Drink?"
- MedlinePlus Medical Encyclopedia. "Alcohol withdrawal"
