Caffeine is the world’s most popular psychoactive substance and for millions of people worldwide, coffee is not just a beverage, it is a necessity, perhaps even a genetic one.
It fuels mornings, boosts moods and sharpens the mind -- or so we like to think.
Research reveals a far more complex story, though, uncovering surprising ways caffeine affects everything from focus and creativity to brain structure and sleep.
Some discoveries might make you rethink your entire coffee routine, while others could explain why that afternoon cup isn't delivering the boost you are expecting.
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Author: Dr Jeremy Dean
Psychologist, Jeremy Dean, PhD is the founder and author of PsyBlog. He holds a doctorate in psychology from University College London and two other advanced degrees in psychology. He has been writing about scientific research on PsyBlog since 2004. View all posts by Dr Jeremy Dean