Does coffee really dehydrate you, or is it just a popular misconception?
Coffee is one of the most widely consumed beverages in France. In 2022, 8 out of 10 French people drank coffee (source: Statista), mainly for its stimulating effects. However, one question often comes up: can coffee cause dehydration? Some claim it acts as a powerful diuretic, reducing body hydration, while others believe it can be part of a balanced daily hydration regime. We shed some light on the subject ;).
The diuretic effects of caffeine
A widely-held belief is that coffee has a dehydrating effect due to the presence of caffeine, a central nervous system stimulant known for its diuretic properties. Indeed, caffeine encourages the evacuation of water and mineral salts through urine, but this effect remains moderate, particularly in habitual consumers.
Does coffee contribute to hydration?
Despite its slight diuretic (urine-creating) action, coffee is still mainly water, which means it contributes to the body's daily water intake. According to dieticians, moderate coffee consumption (around two to three cups a day) does not reduce body hydration. However, it is essential not to replace water entirely with coffee, especially if it is enriched with sugars or cream, which could have other health consequences. As a complement, a diet rich in fruit, vegetables and soups can also play a role in maintaining good hydration.
How do you balance coffee consumption and hydration?
While coffee can be part of a balanced daily hydration regime, it is advisable to monitor the amount of caffeine ingested. Experts suggest no more than 400 mg (0.000882 pounds) of caffeine a day, or about four cups of filter coffee. For pregnant women, adolescents and certain sensitive populations, this limit is even lower. To ensure optimal hydration, alternate coffee consumption with water or decaffeinated beverages.
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