Not ketone bodies, but lactate. More details in this article titled: Energy Substrates for Neurons During Neural Activity: A Critical Review of the Astrocyte-Ne

Not ketone bodies, but lactate. More details in this article titled: Energy Substrates for Neurons During Neural Activity: A Critical Review of the Astrocyte-Neuron Lactate Shuttle Hypothesis[1]: > The brain can consume lactate as a substrate, as has been demonstrated by studies showing that the brain uses lactate during hypoglycemia or during periods of elevated blood lactate [...] > However, because lactate does not pass through the blood-brain barrier nearly as well as glucose [...], lactate cannot serve the brain as a blood-borne substrate the way glucose does. [1]: http://www.nature.com/jcbfm/journal/v23/n11/full/9591474a.html http://www.nature.com/jcbfm/journal/v23/n11/full/9591474a.ht...