This information is intended for healthcare and professional audiences.
- The study of the effect of coffee, and caffeine in particular, on fluid balance can be split into two distinct areas: caffeine intake during exercise, and caffeine intake at rest in the general population.
- The most recent studies and literature reviews on the effects of caffeine during normal life activities conclude that moderate caffeine consumption does not lead to dehydration.
- During exercise, the best quality studies conclude that not only is moderate caffeine beneficial for endurance performance, they also conclude that it does not contribute to body dehydration.
- Advice to abstain from drinking moderate amounts of caffeinated coffee, in order to maintain adequate fluid balance, is unfounded.
- Coffee drinking in moderation contributes to our fluid intake and does not lead to dehydration, or significant loss of body fluid.
- Whilst there is some indication of a mild, short-term diuretic effect of caffeine, this effect is not strong enough to counter-balance the benefits of fluid intake from coffee drinking.
- Black coffee contains more than 95% water. The European Food Safety Authority (EFSA) recently concluded that a cause and effect relationship has been established between the dietary intake of water and the maintenance of normal and physical cognitive function.
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