Coffee consumption and fluid balance

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This is the first of two blog posts on the topic of coffee consumption and fluid balance. Coffee and Health also houses current scientific information on a wide range of other coffee-related topics.


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.

–       Current research on the effects of caffeine during normal life activities concludes that moderate caffeine consumption does not lead to dehydration.

–       During exercise, studies conclude that not only is moderate caffeine beneficial for endurance performance, they also conclude that it does not contribute to body dehydration.

Previous advice, which suggests abstaining 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.

–        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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