The primary purpose of the lipoprotein or lipid transportation system is to transport energy to tissues that need it.

“so few people know that a gigant everybody talks on lipoproteins as if they're delivering cholesterol all over the place that's what we have lipoproteins for that's probably the last reason we have lipoproteins because every cell in your body makes every cholesterol molecule it needs to do what it has to do with a few rare exceptions”