In the study, participants drank about 27 ounces of coffee per day for three days in a row. (For reference, a Starbucks Venti is 20 ounces, a Grande is 16, and a Tall is 12.) Then they drank the same amount of water for three consecutive days. Controlling for physical activity and food and fluid intake, the researchers compared a wide range of hydration markers (body weight, total amount of water in the body, kidney function, urine volume, and blood values) and found no significant difference in subjects’ hydration status when they were drinking coffee versus water. Although the study population is small and specific — 50 adult men who were habitual coffee-drinkers and were told not to exercise during the study — its findings echo similar previously-collected data regarding the relationship between caffeine consumption and hydration.
A 2002 review of 10 different studies concluded that even when consumed in larger amounts caffeine caused no detrimental effects on hydration status or even athletic performance
Considering coffee’s hydrating qualities, not to mention its ability to increase metabolism, enhance memory, and lower risk of death, I think I’ll make my next cup bottomless
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