|Cholesterol, outside the body.|
Cholesterol is not soluble in blood so it has to be hauled hither and thither by a trucking fleet called lipoproteins. It's the size of the trucking fleet that is measured in a blood test. Bad cholesterol (LDL) are huge tractor-trailer rigs that haul the cholesterol from the liver to the cells. Good cholesterol (HDL) are the small panel trucks that takes the excess cholesterol back to the liver for disposal.
When there is too much cholesterol the LDL rigs just dump their loads (picture that 20 ton mayonnaise spill in Missouri last year) and the gunk accumulates in the walls of our arteries. When that happens the result is like a grease build up in your kitchen sink drain and just as disgusting.
I mention this because my blood test came back today and my LDL is low (64mg/dL), my HDL is average (46mg/dL), and my ratio of good to total cholesterol (3.0) is sweet. Yeah, I know I'm bragging.