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People in ketosis actually have higher fasting blood sugar than those on high carb diets- there is an adaptive insulin resistance that preserves glucose for the brain and heart cells that can’t survive without it.

That said- it is an adaptive mechanism that is rapidly reversible, and totally different from type II diabetic insulin resistance.

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> there is an adaptive insulin resistance that preserves glucose for the [specific] brain and heart cells that can’t survive without it.

To be clear, most brain and heart cells do not require glucose to function. Although, a small subset do.

which is why I added "the" before "brain and heart cells"....

I suppose "those" would have worked even better, because the "the" didn't quite register for me before you pointed it out.

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