The primary source of energy used by the brain is fat.

Name: The primary source of energy used by the brain is fat.
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The primary source of energy used by the brain is glucose, which is derived from carbohydrates. While the brain can also utilize ketones, which are produced from fats during periods of fasting or low carbohydrate intake, glucose is still the primary source of fuel for the brain.

The Primary Source of Energy Used by the Brain Is