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. 2016 Jul 8;9:53. doi: 10.3389/fnmol.2016.00053

FIGURE 4.

FIGURE 4

The contrasting ‘Push-Pull’ mechanism of brain fuel supply. Glucose is pulled from the blood into the brain as a function of the brain’s metabolic demand during neuronal activation. Under normal conditions (excluding insulin resistance), ketones are pushed from the blood into the brain in direct proportion to their plasma concentration and irrespective of plasma glucose level.