how does the brain consume 20% of the 2000 calories every day?

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In a similar question, it was mentioned that the human brain consumes around 20% of our energy, that’s 400 calories. What is this energy converted to? I can understand why breathing, digestion and movement requires a lot of energy, but 400 calories for neurons firing tiny amounts of electric signals seems excessive.

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Anonymous 0 Comments

It’s tiny amounts, sure, but it’s a lot of them, and all the time. That adds up to a lot.

Ultimately, this energy is converted to heat.

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