The authors concluded that if the men consumed caffeine-laced water after a two month period of abstinence from both coffee and tea, the volume of their urine increased by 50%, but when they drank coffee regularly again they became inured to its diuretic effects. Meanwhile the volume of their urine was measured regularly. Sometimes they were required to drink four cups of coffee a day sometimes they drank mainly tea and at other times they abstained or drank water laced with pure caffeine. The three men were studied over the course of two winters. Even then there is so little research on the topic, that one of the most frequently mentioned studies was conducted way back in 1928 with a sample of just three people. What’s the evidence?Īlthough tea and coffee contain many different substances the one on which most research focuses is caffeine.
But when we’re exhorted to drink six or eight glasses of water a day (a disputed figure that I’ve discussed previously), it’s usually emphasised that drinks like coffee and tea don’t count towards your daily liquid total because they’re dehydrating. They enjoy the taste and the fact that the caffeine wakes them up. Every day people around the globe drink 1.6 billion cups of coffee and around twice as many cups of tea.
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