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Answers Book · Electrolytes

Does Alcohol Dehydrate You?

The 10-second answer

Yes. Alcohol makes your body send out more water, which raises your risk of dehydration.

The simple answer

Your body has a signal that tells your kidneys to hold on to water. Alcohol turns that signal down, so your kidneys let more water go and you pee more. Heat, an empty stomach and drinking fast can add to it.

Myth vs Fact

Myth

Beer hydrates you, but liquor dehydrates you.

Fact

All alcohol is dehydrating. A standard serving of beer, wine or liquor has about the same alcohol, so about the same effect. A stronger drink poured at the same size can act faster.

The science

  1. Cleveland ClinicCleveland Clinic explains that alcohol reduces release of vasopressin (antidiuretic hormone), so the kidneys reabsorb less water. The body starts limiting this hormone within about 15 minutes of the first drink.
  2. Cleveland ClinicCleveland Clinic lists drinking in heat, on an empty stomach, and quickly as factors that increase the effect, and notes that conditions like diabetes, kidney, liver or heart disease can make fluid balance harder to keep.
  3. NIH / NIAAANIAAA says the mild dehydration from alcohol likely contributes to thirst, fatigue and headache the next day.

Medical sources

How often people ask
How often people ask: High

Keep reading

ElectrolytesDoes Alcohol Deplete Electrolytes?ElectrolytesWhy Does a Hangover Feel Like Dehydration?
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This page is general information, not medical advice. Sources are linked above. If you're worried about yourself or someone else, contact a healthcare provider or call 911.
Last checked: October 8, 2026