Under normal circumstances, the only energy source for the brain is glucose.

Name: Under normal circumstances, the only energy source for the brain is glucose.
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Glucose is the primary energy source for the brain, as it is the only molecule that can easily cross the blood-brain barrier and be used for energy by brain cells. While the brain can also use ketones derived from fat as an alternative energy source, this only occurs during periods of prolonged fasting or carbohydrate restriction.

Under Normal Circumstances, the Only Energy Source for the Brain