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Caffeine reaches the bloodstream about 45 minutes after it’s consumed, so it takes that long before you can expect to feel its effects. Your blood carries caffeine to your brain and also throughout your entire body.

Eventually, your liver will break down the caffeine and turn it into other chemicals. These chemicals also have effects on your body. They make your blood vessels dilate , which increases blood pressure. They make you produce more urine than usual.

Finally, the caffeine’s chemicals pass through your kidneys and leave your body through your urine. After about 5 hours, half of the caffeine you con- sumed will be out of your body—but it takes a full 24 hours before it’s totally gone. This means you may be feeling caffeine’s effect nearly a day after you drank your last cup of coffee!

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