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My first thought was "Does this mean if I want a BCI, I'll have to start eating sugar again?"

Your body uses glucose as fuel. You can generate it from other kinds of fuel sources, but unless you're in a diabetic coma, I guarantee your body has plenty of glucose in it.

Very little if you're on a ketogenic diet, which is often used for hard-to-treat epilepsy.

This -- on a good day my brain's running mostly on ketones

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