Cholesterol is essential for cell membrane structure, fluidity, and channel formation.

“cholesterol is obviously a fat lipid it's a critical element in cell structure it's in all cell membranes the amount that's in the cell membrane is is determinative of the function of the membrane”

“the first is that they contribute heavily to the cell membrane of virtually every cell in the body so cells are actually kind of fluid things spherical things and what allows them to have that fluidity and what allows them to have membrane channels that allow things in and out of them is the cholesterol layer that forms the membrane”