Despite making up only about two percent of an adult's body weight, the brain consumes about what percentage of energy?
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The human brain is an energy hog, demanding roughly 20% of the body's glucose and oxygen to keep its network of neurons firing. Even when you are completely at rest or fast asleep, this metabolic rate barely drops because the brain is constantly maintaining its complex cellular state. Photo: Gaetan Lee . Tilt corrected by Kaldari., Wikimedia Commons, CC BY 2.0.
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Source: Wikipedia (CC BY-SA)
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