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I think the brain prefers glycogen to anything but in it's absence ketones are produced/used. IANAD but I think that they a more steady form of fuel for the brain. Unlike glycogen/carbs you don't get that rise and fall of energy. That steady flow was one of the best things I found about being low carb/in ketosis.
jdp
I never would have believed it until going on LCHF.
When I was in keto I definitely felt more alert.
Maybe ketones are better fuel for brains than carbs?