Many widely repeated “facts” about alcohol are either completely false or misleading enough to be dangerous. Some of these myths affect how people make decisions about drinking, driving, and staying safe in cold weather. Here are the most persistent falsehoods, and what the evidence actually shows.
Coffee, Cold Showers, and “Sobering Up”
One of the most stubborn myths is that coffee, a cold shower, or fresh air can sober you up faster. None of these change your blood alcohol level. Your liver processes alcohol at a roughly fixed rate of about 7 grams per hour, which works out to approximately one standard drink per hour for an average-weight adult. No food, beverage, or activity meaningfully speeds that up.
Caffeine can make you feel more alert, which is actually part of the problem. Some researchers have investigated whether mixing caffeine with alcohol creates a “masking effect,” making people feel less drunk than they are. The evidence is mixed, but the key point is consistent: caffeine does not lower your blood alcohol concentration by a single point. Your breath alcohol readings remain identical whether you drink alcohol alone or combine it with coffee or energy drinks. Feeling more awake is not the same as being less impaired.
Alcohol Does Not Actually Warm You Up
That flush of warmth after a drink is real, but it’s a trick your body is playing on you. Alcohol causes blood vessels near the skin’s surface to widen, sending warm blood to your extremities and making your skin feel hot. At the same time, this pulls heat away from your core. Research shows alcohol lowers the temperature at which your body triggers its natural cold-defense response (vasoconstriction) by about 0.3°C, meaning your body is slower to protect itself from heat loss.
This is why drinking in cold weather is genuinely dangerous. You feel warm while your core temperature drops, increasing the risk of hypothermia. The subjective sensation of warmth is the opposite of what’s happening internally.
Mixing Drinks Doesn’t Cause Worse Hangovers
“Beer before liquor, never been sicker” is a rhyme, not a rule. The order in which you consume different types of alcohol has no demonstrated effect on hangover severity. What matters is the total amount of alcohol you drink and, to a lesser extent, the type.
Darker alcoholic beverages like bourbon, red wine, and brandy contain higher levels of congeners, which are chemical byproducts of fermentation. One study gave participants either bourbon or vodka in similar amounts. Those who drank bourbon, which is high in congeners, reported significantly worse hangovers than the vodka group. So the color and type of drink can matter, but the sequence doesn’t.
Drinking Water Won’t Prevent a Hangover
It sounds logical: alcohol dehydrates you, so drinking water should prevent a hangover. But survey data on actual drinking behavior found that water consumption during or directly after alcohol had only a modest effect on preventing next-day hangovers. Even more telling, the amount of water people drank during a hangover had no relationship to how quickly their symptoms improved or how severe they were.
Alcohol does suppress the hormone that tells your kidneys to retain water, which is why you urinate more when drinking. Dehydration contributes to some hangover symptoms like thirst and dry mouth. But hangovers also involve inflammation, disrupted sleep, and changes in stomach acid and blood sugar. Staying hydrated is sensible, but it’s not a hangover cure or a reliable prevention strategy.
Alcohol Helps You Fall Asleep, Not Sleep Well
People often say alcohol helps them sleep. It does make you fall asleep faster and initially produces deeper slow-wave sleep in the first half of the night. But the second half is a different story. Research on young adults who drank to a blood alcohol level of about 0.08% found that the second half of their sleep was significantly disrupted: they woke up more often, spent less time in deep sleep, and their overall sleep efficiency dropped.
Critically, alcohol suppresses REM sleep, the stage associated with memory consolidation and emotional processing. There was no REM rebound in the second half of the night to compensate. So while you may fall asleep faster, you wake up less rested. Over time, using alcohol as a sleep aid worsens sleep quality rather than improving it.
“Alcohol Kills Brain Cells” Is an Oversimplification
The common claim that every drink “kills brain cells” isn’t exactly right, but the truth isn’t reassuring either. At moderate drinking levels, the primary damage is to dendrites, the branch-like extensions that neurons use to communicate with each other. Alcohol shrinks these structures, reducing the size and complexity of the connections between brain cells.
At high blood alcohol levels, however, actual neuronal death does occur, particularly in brain regions involved in memory and learning. Animal studies show that heavy alcohol exposure causes a combination of outright cell death, shrinkage of existing neurons, and suppression of new neuron creation. The reality is more nuanced than “kills brain cells,” but not in a way that makes alcohol safer for the brain. It disrupts the brain’s structure and its ability to repair itself.
Alcohol Is Not a Stimulant
The initial buzz from a drink, the lowered inhibitions and surge of confidence, leads many people to think alcohol is a stimulant. It isn’t. Alcohol is classified as a central nervous system depressant. That early euphoria happens because alcohol suppresses inhibitory brain circuits first, essentially turning down the volume on the part of your brain that makes you cautious and self-conscious. The result feels like stimulation, but it’s actually the removal of a brake, not the pressing of an accelerator.
As you continue drinking, the depressant effects become dominant. Alcohol enhances the brain’s main inhibitory chemical messenger while simultaneously blocking its main excitatory one. The combined effect is sedation, slowed reaction time, impaired coordination, and eventually stupor. The biphasic nature of alcohol, feeling “up” then “down,” is why it’s so commonly misunderstood.
Alcohol Calories Are Not Harmless
Some people discount the calories in alcoholic drinks or assume they don’t “count” the same way food calories do. Each standard drink contains roughly 100 to 150 calories, and ethanol itself provides about 7 calories per gram, nearly as calorie-dense as fat. These are often called “empty calories” because alcohol provides no vitamins, minerals, or protein.
Your body can’t store alcohol calories as glycogen, the quick-access energy your muscles use. Instead, your body prioritizes metabolizing alcohol over everything else and converts the excess into fatty acids. This is one reason regular drinking contributes to weight gain and, over time, fatty liver disease, even in people who don’t consider themselves heavy drinkers.