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About 20-50% of consumed calories are used for brain function. Studies have been done showing the people with higher IQs may use less energy for a given task (that has already been learned) than people with lower IQs. Of couse, the amount of energy used by the brain also depends on the tasks performed and how much brain activity is involved in each task (harder tasks may require closer to 50% of calories while simple tasks may only need 20%). Individuals are also variable, so different brains may take up different proportions of calories in different people.

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