Does Coffee Dehydrate You. What is a diuretic anyway? Many people believe coffee contributes to dehydration.

No, coffee does not dehydrate you.

This belief stems from a very small but very influential study published in 1928. Does drinking coffee make you dehydrated? According to the institute of medicine, women should be consuming 95 ounces and men 131 ounces daily. It may have something to do with how caffeine physically affects the kidneys through mechanisms like lowering sodium. A major reason why people drink coffee is for its caffeine, a psychoactive substance that helps you stay alert and aids performance. Does coffee really dehydrate you? Do coffee and tea dehydrate you? The diuretic effects on regular coffee drinkers seem to be way less pronounced than on those who have it infrequently and avoiding coffee for as little as 4 days can reverse the adaptations that reduce that diuresis markedly. We often hear that coffee and other caffeinated drinks will dehydrate us. This means that it causes your kidneys to flush extra water through your body and out into your urine without absorbing as much of it as it normally would. First up, coffee and caffeinated beverages.