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[3] is very much not correct. Your brain can just fine on ketones.

Your body is also capable of making it's own glucose, for the organs that need it: https://chem.libretexts.org/Bookshelves/Biological_Chemistry....

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From the review article “Glucose cannot be replaced as an energy source but it can be supplemented, as during strenuous physical activity when blood lactate levels are elevated [14] or during prolonged starvation [15] when blood levels of ketone bodies are elevated and BBB monocarboxylic acid transporter (MCT) levels are upregulated”

And tbh, I would be more inclined to believe the peer reviewed article on glucose metabolism in the brain by an established neuroscientist tbh.

I have edited my comment to reflect that glucose is not the only energy source (although it is still REQUIRED)

Point you’re missing is that glucose that is required can be produced by our body, so there is zero need for glucose or simple carbs (and arguably any carbs) in out diet.

So keto is very much the primary system, breaking down carbs is actually a “holy crap look at all this energy in our bloodstream, let’s secrete insulin and shove it all into lipid cells so that it can later be used BY KETO, OUR PRIMARY ENERGY SYSTEM”.

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