During starvation ketone bodies can take the place of glucose as a fuel for brain cells.

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During starvation, the body uses up its glycogen stores for glucose production to meet the energy needs of the brain. However, once the glycogen stores are depleted, the liver starts producing ketone bodies from fatty acids as an alternative source of energy for the brain cells. Therefore, ketone bodies can take the place of glucose as a fuel for brain cells during starvation.

During Starvation Ketone Bodies Can Take the Place of Glucose