Power of the Brain
30 Apr 2008 @10:44A little while ago, I was wondering to myself how much power the brain uses. Today, BoingBoing helped me answer that question:

The brain consumes 20 percent of your body’s energy, but what for? Turns out a third of the energy is spent on “housekeeping.”
I crossed check this and 20% appears to be dead on (see http://hypertextbook.com/facts/2001/JacquelineLing.shtml). As it turns out, it’s also about 20 Watts of power to run the brain (on a roughly 2000 food calorie diet).
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20 Watts = 4.78 cal/s = 413 food calories a day! Damn. Maybe that’s why us blondes are skinnier Andrew, because we have to think more than normal people.