Does coffee hydrate? Between misconceptions, diuretic effects and the real impact on hydration
Does coffee hydrate or dehydrate?
Coffee is the most consumed beverage in the world after water. Every day, millions of people start their morning with an espresso or filter coffee. But one question still divides opinion: does coffee hydrate or, on the contrary, dehydrate?
This belief stems from caffeine's diuretic reputation, which is supposed to cause the body to eliminate more water than it takes in. However, recent research provides a much more nuanced answer. Let's look at this in detail.
Where does the doubt about coffee and hydration come from?
For a long time, caffeine was considered a powerful diuretic. It does stimulate the nervous system and slightly increases urine production. This observation gave rise to the belief that coffee could not be counted toward daily fluid intake. This myth spread through popular culture, to the point of becoming a "truth" shared by many consumers.
However, confusing a diuretic effect with dehydration is a mistake. Producing more urine after a coffee does not mean that the body loses more liquid than it receives. To understand, we must look at the most recent scientific data.
Coffee contributes to hydration: what the studies say
Modern research clearly shows that coffee contributes to hydration. A study published in the journal PLOS ONE in 2014 compared the effects of coffee and water on hydration in adult men. Result: no significant difference in terms of urine volume, blood osmolarity, or electrolyte balance. In short, drinking black coffee hydrates as well as drinking water.
This result is not isolated. Other scientific studies confirm that coffee and tea, consumed in moderation, can be counted toward daily fluid intake, just like water or herbal teas.
Why coffee does not dehydrate (in reasonable quantities)
Coffee is composed of more than 95% water. Its hydrating effect is therefore natural, and its slight diuretic effect is largely offset by the liquid intake. Furthermore, in people who drink coffee regularly (2 to 3 cups a day), the body develops a tolerance that reduces the initial diuretic effect.
However, some specific cases exist:
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In people not used to it, the diuretic effect can be more pronounced.
- In cases of excessive consumption (beyond 5 to 6 cups a day), the increase in urine can accentuate water loss.
But within a framework of moderate consumption, there is no reason to think that coffee dehydrates.
Coffee in your daily fluid intake
The recommendations of ANSES (the National Agency for Food Safety) suggest a daily fluid intake of 2 to 2.5 liters per day, of which about 1 to 1.5 liters come from beverages. Contrary to popular belief, coffee can perfectly well be included in this calculation.
In practice, it is recommended to cover fluid needs as follows:
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70 to 80% through beverages (water, coffee, tea, herbal teas, broths, milk...).
- 20 to 30% through food (fruits, vegetables, dairy, etc.).
An espresso of 30 ml or a filter coffee of 250 ml therefore provides a quantity of water useful to the body. Even iced coffee (cold brew) contributes to hydration, as long as we limit added sugar.
Shoukâ specialty coffee: pleasure and balance every day
At Shoukâ, we roast our specialty coffees by hand, in small quantities, in our workshops in Chamonix. Our coffees come from traceable plantations, respectful of producers and the environment. Picked at maturity, sorted with care and freshly roasted, they offer a smoother, more balanced and more digestible cup than industrial coffees.
Thanks to this quality, our specialty coffees fit perfectly into a healthy routine, while contributing to your fluid intake. Whether you drink them as an espresso, filter, decaf, or even cold brew, they are an ideal everyday companion.
And to vary the pleasures, our natural teas and herbal infusions are also perfect for hydration, caffeine-free, at any time of the day.
Conclusion: coffee hydrates, provided you stay moderate
Contrary to popular belief, coffee does not dehydrate. It does indeed contribute to daily hydration, just like water or tea, as long as it is consumed in reasonable quantities. Slightly diuretic for beginners or in cases of excess, it remains a valuable source of liquid for the vast majority of consumers.
In summary:
- Yes, coffee hydrates.
- No, it does not "dry out" the body.
- Yes, it can count toward your daily intake, in moderation.
With Shoukâ specialty coffees, combine pleasure, balance, and hydration in every cup.
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