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Coffee doesn't dehydrate, that's a common urban myth https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/caffeinated-drinks

Coffee doesn't dehydrate, that's a common urban myth https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/caffeinated-drinks/faq-20057965 https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-h...

tedmiston 6y ago
Very intersting. I did not expect that. > Though the caffeine in coffee may have a diuretic effect, it’s unlikely to dehydrate you. > For caffeine to have a significant diuretic effect, studies show that you need to consume more than 500 mg per day — or the equivalent of 5 cups (40 ounces or 1.2 liters) of brewed coffee (12, 13, 14). > A study in 10 casual coffee drinkers reviewed the impact of drinking 6.8 ounces (200 ml) of water, lower caffeine coffee (269 mg of caffeine), and high caffeine coffee (537 mg of caffeine) on signs of dehydration. > Researchers observed that drinking the higher caffeine coffee had a short-term diuretic effect, whereas the lower caffeine coffee and water were both hydrating (15). > In addition, other studies show that moderate coffee intake is as hydrating as drinking water (16). > For example, a study in 50 heavy coffee drinkers noted that drinking 26.5 ounces (800 ml) of coffee daily for 3 days was equally as hydrating as drinking the same amount of water (16). > Also, an analysis of 16 studies discovered that taking 300 mg of caffeine in a single sitting — equivalent to 3 cups (710 ml) of brewed coffee — increased urine production by only 3.7 ounces (109 ml), compared with drinking the same amount of non-caffeinated beverages (17). > So, even when coffee makes you urinate more, it shouldn’t dehydrate you — as you don’t lose as much fluid as you originally drank. https://www.healthline.com/nutrition/does-coffee-dehydrate-you#dehydrating-effect https://www.healthline.com/nutrition/does-coffee-dehydrate-y...
- freehunter 6y ago
  It might be unexpected because if you’re like me, you feel super dehydrated after a cup of coffee. It might not actually dehydrate me but I feel like it does. And water makes it feel better.
madeofpalk 6y ago
My personal findings/theory is that I’m drinking coffee in lieu of water, so I’m not getting the hydration I ‘need’, and feel thirsty after sometimes.
headcanon 6y ago
Hmm, I thought that because it was a diuretic that it would cause dehydration. I stand corrected - thanks for clearing that up!

tedmiston 6y ago

Very intersting. I did not expect that. > Though the caffeine in coffee may have a diuretic effect, it’s unlikely to dehydrate you. > For caffeine to have a significant diuretic effect, studies show that you need to consume more than 500 mg per day — or the equivalent of 5 cups (40 ounces or 1.2 liters) of brewed coffee (12, 13, 14). > A study in 10 casual coffee drinkers reviewed the impact of drinking 6.8 ounces (200 ml) of water, lower caffeine coffee (269 mg of caffeine), and high caffeine coffee (537 mg of caffeine) on signs of dehydration. > Researchers observed that drinking the higher caffeine coffee had a short-term diuretic effect, whereas the lower caffeine coffee and water were both hydrating (15). > In addition, other studies show that moderate coffee intake is as hydrating as drinking water (16). > For example, a study in 50 heavy coffee drinkers noted that drinking 26.5 ounces (800 ml) of coffee daily for 3 days was equally as hydrating as drinking the same amount of water (16). > Also, an analysis of 16 studies discovered that taking 300 mg of caffeine in a single sitting — equivalent to 3 cups (710 ml) of brewed coffee — increased urine production by only 3.7 ounces (109 ml), compared with drinking the same amount of non-caffeinated beverages (17). > So, even when coffee makes you urinate more, it shouldn’t dehydrate you — as you don’t lose as much fluid as you originally drank. https://www.healthline.com/nutrition/does-coffee-dehydrate-you#dehydrating-effect https://www.healthline.com/nutrition/does-coffee-dehydrate-y...

freehunter 6y ago
It might be unexpected because if you’re like me, you feel super dehydrated after a cup of coffee. It might not actually dehydrate me but I feel like it does. And water makes it feel better.

madeofpalk 6y ago

My personal findings/theory is that I’m drinking coffee in lieu of water, so I’m not getting the hydration I ‘need’, and feel thirsty after sometimes.

headcanon 6y ago

Hmm, I thought that because it was a diuretic that it would cause dehydration. I stand corrected - thanks for clearing that up!