Meet Your Brain · Brain
2% of your body weight, around 20% of your energy.
Your brain is about 2% of your body weight and consumes roughly 20% of your energy — running constantly, whether you're solving equations or staring at a wall.
That bill never really drops. Thinking hard costs surprisingly little extra; the brain's baseline activity is the expensive part. It's also why the brain has no meaningful fuel reserve of its own and depends utterly on a continuous blood supply — interrupt it and consciousness goes within seconds.
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