Does Coffee Dehydrate You? Let’s Research

Caffeine can slightly increase urine production, especially in people who rarely consume it. However, coffee is made up of more than 95% water, and the fluids it provides more than compensate for this mild effect. Multiple scientific studies have shown that moderate coffee consumption does not lead to dehydration and can contribute to overall daily fluid intake.

For habitual coffee drinkers, the body adapts to caffeine over time. This adaptation significantly reduces any diuretic impact, meaning regular coffee consumers experience little to no difference in hydration compared to drinking water. In fact, research comparing coffee and water intake has found no meaningful differences in hydration markers such as body water balance.