Well, it's just tremendously confusing how doctors in general, various researchers, and the media refer to lipoproteins (HDL, LDL, or total of these plus a percentage of triglycerides) as "cholesterol" when they are no such thing. Cholesterol is a particular, exact kind of molecule of its own, entirely different kind.
HDL and LDL are particles comprising proteins, which carry fats and also carry cholesterol. But they are not cholesterol, simply aren't, and their levels don't say how much actual cholesterol -- the real stuff, the molecule itself -- there is in the body.
Cholesterol itself is not a particle, nor a protein.
HDL, LDL, and "total cholesterol" (which is total of HDL and LDL, plus strangely 20% of your triglycerides, meaning fats) are not used in steroid biosynthesis.
It's kind of like confusing trains with business executives.
It could be true that many business executive, as well as other people, go to work in NYC on trains.
But calling the trains "business executives," or measuring how many business executives commute to NYC each morning by counting trains, would be a mistake.
I know it could sound unbelievable that so many authorities could use words so badly and generate such confusion, but they do. Cholesterol is a different substance entirely from HDL, LDL, or the total of HDL, LDL, and 20% of triglycerides. It is real cholesterol that is used for steroid biosynthesis, not these illogically and confusingly named other things.
The bad naming even results in wrong thinking by some of these authorities. They conclude, for example, that foods which contain cholesterol must, logically, increase blood "cholesterol." After all, the dietary cholesterol is going to go right into your bloodstream thus raising blood "cholesterol," right?
Well no because they are different substances entirely.