This information is intended for healthcare and professional audiences.
At a glance
- The study of the effect of coffee, and caffeine, on fluid balance can be split into two distinct areas: caffeine intake during exercise and caffeine intake at rest in the general population. Recent research shows that:
- Moderate caffeine consumption does not lead to dehydration in the general population.
- During exercise, caffeine is beneficial for endurance performance and does not contribute to dehydration.
- Advice to abstain from drinking moderate amounts of caffeinated coffee, in order to maintain adequate fluid balance, is unfounded.
- Moderate coffee consumption contributes to our fluid requirements and does not lead to dehydration, or significant loss of body fluid.
- The mild, short-term diuretic effect of caffeine is not strong enough to counter-balance the benefits of fluid intake from coffee drinking. Black coffee contains more than 95% water.
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