The Brain Loves Glucose
Metabolism Made Easy - A podcast by A J Ghalayini, Ph.D.

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With the exception of ketone bodies, the brain is entirely dependent on glucose as an energy source under most circumstances. Glucose is oxidized all the way to CO2 by the brain, producing up to 38 ATPs. This catabolism is dependent on oxygen, which is used to convert the energy in NADH and FADH2 to ATP through the Electron Transport Chain and Oxidative Phosphorylation.