>>76448592
>The brain runs on ketones when ketones are in the bloodstream
The brain never runs exclusively on ketones, ever.
Even after weeks of fasting which puts you in complete ketosis the brain runs on like 40% glucose, the ketones are there as a last resort to avoid organ failure by lowering glucose requirements and consumption rates but it never gets rid of the glucose demand. All life needs glucose.
GNC is not done by the brain but by your liver and your CNS detects blood sugar fluctuations and signs of stress and reacts accordingly.