Your brain uses up to 20% of all your energy.

Model_of_a_human_brain
Model of a human brain, Europe, 1801-1850. By Wellcome Images cc4.0

Ever feel tired just from thinking? That makes sense since the brain uses up more of the energy in your body than any other organ. In fact, it operates on the same amount of energy as a 10 to 23-watt lightbulb. The brain also uses 20% of the oxygen and blood in your body.

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