It will come as no surprise to coffee lovers everywhere, but caffeine works in just ten minutes, according to new research.
The study headed by researchers from the University of Barcelona has shown that caffeine has an almost immediate effect.
Previous research had shown that alertness starts to increase nearly an hour after consumption, but the new study reveals that the effects in fact begin after as little as 10 minutes.
According to lead author Ana Adan, from Barcelona University, ‘45 minutes is the time needed for maximum caffeine concentration to be reached in the blood, but levels reach half this concentration after just a few minutes’.
And men were found to become more alert than women after having an espresso.
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