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The blood vessels in the brain prevent cholesterol from passing through due to the blood-brain barrier.

The first part of this abstract breaks down the current understanding nicely: https://www.mdpi.com/1467-3045/47/2/115

Then how come you start forgetting things when your cholesterol gets way high, like 4x the reference/normal value?

Just speculating, but if your cardiovascular function degrades due to cholesterol, it should have an impact on the brain.

That's actually a good idea, thanks.

TIL! Thank you.