Coffee Doesn't Give You Energy — Transcript
Full transcript
- 0:00Coffee doesn' give you energy. It hides
- 0:02how tired you are.
- 0:05Throughout the day, your brain cells
- 0:07burn energy, and a molecule called
- 0:09adenosine builds up as a byproduct.
- 0:13[music] It settles into receptors on
- 0:15your neurons.
- 0:16The more receptors it fills, the heavier
- 0:18your eyelids feel.
- 0:20Caffeine has almost the same shape as
- 0:23adenosine. It slips into those same
- 0:25receptors and sits there without
- 0:27switching them on.
- 0:28The signal for tiredness never arrives.
- 0:30[music]
- 0:33But adenosine doesn't stop building up.
- 0:35It keeps [music] collecting around the
- 0:37blocked receptors.
- 0:39Caffeine peaks in your blood within
- 0:41about an hour, and its half-life is
- 0:43around 5 hours. [snorts]
- 0:45As it clears, the extra adenosine takes
- 0:47the freed receptors, and the tiredness
- 0:49you put off comes back all at once.
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