Why is drinking coffee not the same as drinking water?

Why is drinking coffee not the same as drinking water?

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  1. Yes, coffee is mostly water, but, be aware coffee contains caffeine, a diuretic compound that can increase urination frequency. So you may end up loosing more water than if you had simply drank water.

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  2. Yes.
    It’s long been known that coffee is net hydrating, that is, you take in more water than you pee out, but it was also assumed that because of caffeine’s mild diuretic effect, coffee was less hydrating than water.
    That may not be the case. A 2014 study at the University of Birmingham in England has found that coffee hydrates about as well as pure water, at least for moderate coffee consumption.
    The investigators analyzed hydration status on 50 male subjects using several established measures—body mass, total body water, and blood and urine tests. They found the hydration effects of coffee or water did not differ significantly.
    (Women were not included in the study because their menstrual cycles may cause fluid balance fluctuations.)
    Pretty much your body absorbs as much water as it needs and expels the rest, caffeinated or not. So you can count those cups of coffee or tea towards your daily fluid intake.
    Enjoy.

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  3. Coffee has been processed, and has other things going on in it???
    Where as water is natural, and has nothing going on in it!!!
    But the only thing, they have in common is, DEATH!!!
    COFFEE IS, CAFFEINE OVERDOSE!!!
    WATER IS, YOUR BODY MINERALS, WILL BE DILUTED, OR YOU’LL DROWN, FROM TOO MUCH WATER INTAKE.
    SO I’VE GIVEN 2 CHOICES, TOO KICK THE BUCKET???

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  4. Coffee can act as a diuretic – it can cause you to pee out more water than you take in. As such, coffee may dehydrate you. However, once a person’s body becomes acclimated to coffee, that diuretic effect diminishes. So for experienced coffee drinkers, hydration-wise, there is no difference between drinking coffee and drinking water.
    Source: Journal of the American Medical Association: Coffee Hydrates as Well as Water, Study Says

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  5. Oh, stuff and nonsense! Read up on more recent studies than what your Aunt Ellie told you one day when you were a kid.
    Coffee can count. It’s a very minor diuretic so you might need to take in a tad more than your arbitrary (yes, that figure is arbitrary – how big is a “glass”) eight glasses.
    The attachment is a bit dense but the summary is that coffee is only slightly less efficient at rehydration than other liquids and is NOT a diuretic.
    randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index | The American Journal of Clinical Nutrition | Oxford Academic

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  6. It does, but caffeine is a diuretic so it removes liquid as it adds it. Soup counts, tea counts, coffee counts… but water counts more.

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  7. If you use a beverage-water tracking app, coffee generally still counts toward water volume, albeit not at 100% of water value. My app counts it at 80% of water volume i.e., 10 ounces of coffee count as having drank 8 ounces of water. This is because coffee is a mild diuretic—though not as an extreme one as wine or distilled liquor.

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  8. Primarily Water!=Coffee
    Coffee has this element – caffeine, which has adverse effects in greater amounts.
    Coffee doesn’t quench thirst as water does (now this is based on my personal experience)
    Coffee contains milk, which is allergic to some (I’ve never known anyone allergic to water)
    Coffee has elements which are not present in water. These elements may be beneficial or harmful depending on the usage, amount and the person.
    On a funny note, coffee can contain water in it, but water can’t contain coffee in it!
    This list can go on and on…

    Eight O’Clock

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  9. Coffee is a substance that promotes production of urine (a Diuretic ) and a stimulant (if it is not de-caffeinated). Excess loss of water (as a result of overuse of diuretics and no rehydration) can result in many condition, like Hypovolemia .
    Water is just plain old H2O. Water, as everyone (hopefully) knows, hydrates you.
    All that being said, I’ve had lots of coffee before long runs or foot-marches in the Army and never fainted or went into hypovolemic shock from dehydration, but I’ve known people who have, so I think its an individual thing.

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  10. Caffeine is a part of xanthines, which limit the reabsorption of sodium in your cells, and increases the flow of fluid through your kidneys. That is what reduces the level of water in your body, so yes, coffee, along with caffeinated soda and teas, will dehydrate you.
    In response to your other answerer (TN Cheshire) alcohol and coffee I believe are equal (?), they just act in different ways. Alcohol inhibits an anti diuretic hormone naturally occurring in your body, which means the feeling preventing you from peeing, doesn’t prevent you from peeing.
    A call back to college, don’t break the seal!
    So, in theory, you ~could~ be hydrated by the water in coffee, but you would have to drink way more than 8 cups. I wouldn’t recommend it, and I always recommend drinking more coffee. 🙂

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