Hangovers are your body's reaction to drinking too much alcohol. While the only guaranteed way to avoid a hangover is to not drink, there are evidence-based strategies that can significantly reduce the severity of symptoms.
Hangovers are not caused by a single factor — they result from multiple physiological effects of alcohol and its metabolites:
Food in your stomach — especially foods rich in fat, protein, and complex carbohydrates — slows alcohol absorption, lowers peak BAC, and reduces the load on your liver. This is one of the most effective hangover prevention strategies.
Starting your evening well-hydrated gives you a buffer against the dehydrating effects of alcohol. Drink 1–2 glasses of water before your first alcoholic drink.
Deciding your maximum number of drinks before you start — and tracking them — is the most reliable way to stay within a range that minimizes hangover risk.
Your liver metabolizes roughly one standard drink per hour. Staying near this rate keeps BAC lower and gives your body time to process alcohol and its byproducts.
Having a glass of water between alcoholic drinks helps maintain hydration, slows your drinking pace, and reduces total alcohol consumption over the evening.
Clear spirits (vodka, gin, white rum) contain fewer congeners than dark spirits (whiskey, bourbon, brandy). A 2010 study in Alcoholism: Clinical and Experimental Research found that bourbon (high congeners) produced worse hangover severity than vodka (low congeners) at the same BAC.
Carbonation speeds up gastric emptying and can increase the rate of alcohol absorption. If you prefer fizzy drinks, be aware they may lead to faster intoxication.
Rehydrating before sleep helps counteract fluid loss. Aim for at least 500 ml (2 cups) of water. Adding an electrolyte supplement or eating a salty snack can help replenish lost sodium and potassium.
Bland, easy-to-digest foods like toast, bananas, eggs, and oatmeal can help settle your stomach, replenish blood sugar, and provide vitamins depleted by alcohol (especially B vitamins and zinc).
Sleep is disrupted by alcohol, so extra rest the next day lets your body repair. Hangover symptoms typically peak when BAC returns to zero and resolve within 24 hours.
Congeners are chemical byproducts of fermentation and aging. They contribute to the flavor, color, and aroma of alcoholic beverages — but they also contribute to hangover severity.
Key congeners include methanol, acetone, tannins, and fusel alcohols. Methanol in particular is metabolized into formaldehyde and formic acid, which can intensify headaches and nausea.
✗ "Hair of the dog" — drink more alcohol to cure a hangover
Drinking more alcohol may temporarily ease symptoms by delaying the metabolism of methanol, but it only postpones and often worsens the inevitable hangover. It also increases the risk of developing alcohol dependence.
✗ "Beer before liquor, never sicker"
The order of drinks has no scientific basis for affecting hangover severity. What matters is the total amount of alcohol consumed and the congener content of what you drink.
✗ "Greasy food the morning after absorbs the alcohol"
By morning, the alcohol has already been absorbed and metabolized. Heavy, greasy food may even irritate an already inflamed stomach. Bland food is a better choice.
✗ Hangover cure supplements and pills
No commercially available supplement has been proven in rigorous clinical trials to prevent or cure hangovers. Some may help with individual symptoms (e.g., electrolytes for dehydration), but none address the root causes.
This information is for educational purposes only. The most effective way to prevent a hangover is to drink moderately or not at all. If you experience frequent severe hangovers, it may be a sign you are drinking too much. Consider speaking with a healthcare professional.