How would one know if CSF membrane cholesterol is low ? Is there a test for that ?

I read long ago that low cholesterol increases the risk of Alzheimer's.

I know my cholesterol is not great. The bad cholesterol is not great and the good cholesterol is not great. My total is OK by old standards but not newer standards. I bet most of us do not have quick access to the numbers.

A quick review of the literature suggests that highly unsaturated fatty acids are more involved. Also, the blood brain barrier blocks circulatory cholesterol from entering the brain. CNS cholesterol is synthesized on the brain side of the blood brain barrier.

There is a lot to read on this issue. Fatty acids are well know as needed for good brain health.

I think I am with you at wondering if low fat diets contribute to concussion risks. I have never held to a low fat diet. We just avoid the bad processed fats. I read an article about oxidized cholesterol and try to limit it.