Why You Should Avoid Coffee When You're Hungover - Tasting Table
Briefly

Hangovers result in painful symptoms that come the day after drinking. While coffee is often consumed for relief, it may worsen hangover symptoms due to its diuretic properties, which promote dehydration. Alcohol also acts as a diuretic, leading to further discomfort. The best strategy is to hydrate properly with water, as no real cure exists for hangovers. Drinking water assists in alleviating symptoms by rehydrating the body, counteracting the effects of previous alcohol consumption.
After a night of drinking, your beverage choices the next day can exacerbate your symptoms, particularly coffee, due to its diuretic properties which promote dehydration.
While the internet is awash with theories on how to cure a hangover, there's little research behind these claims; ultimately, drinking water is essential for rehydration.
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