@NoCrbs4Me I suggest you read more recent papers 1997 is a long time ago in this field. . A good start would be those more recent papers that reference the paper. Start with the review at the bottom of the list which outlines why it was thought even by 2004 that there was no 'net or even bidirectional transfer' of lipoproteins across the BBB But this is really off topic so I won't add any more.
From "Nutrition and Alzheimer's disease: The detrimental role of a high carbohydrate diet", December 2010 (http://people.csail.mit.edu/seneff/EJIM_PUBLISHED.pdf):
"It had long been thought that the blood brain barrier (BBB)
prevented the transport of lipids from the bloodstream into neurons
in the brain [19]. However, it has now been shown conclusively that
mechanisms exist to promote transport of LDL intact across the BBB
via an LDL-receptor mediated mechanism in astrocytes [20]."
I also will not add any more.