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WHAT DOES CAFFEINE DO TO YOUR BRAIN?
8.
The chemical in caffeine changes the way your brain works because
it’s a lot like another chemical called adenosine. Adenosine is a brain
chemical that causes drowsiness by slowing down nerve cell activ-
ity.
Receptors
in your brain cells normally bind with adenosine—but
when caffeine comes along, they bind with it instead. Now adenosine
can’t do its job. Your nerve cells keep firing. You stay alert instead of
getting sleepy.