Now that we"ve defined good and bad cholesterol, it has to be said that there is actually only one type of cholesterol. Ron Rosedale, MD, who is widely considered to be one of the leading anti-aging doctor in the United States, does an excellent job of explaining this concept:
"Notice please that LDL and HDL are lipoproteins -- fats combined with proteins. There is only one cholesterol. There is no such thing as "good" or "bad" cholesterol.
Cholesterol is just cholesterol.
It combines with other fats and proteins to be carried through the bloodstream, since fat and our watery blood do not mix very well.
Fatty substances therefore must be shuttled to and from our tissues and cells using proteins. LDL and HDL are forms of proteins and are far from being just cholesterol.
In fact we now know there are many types of these fat and protein particles. LDL particles come in many sizes and large LDL particles are not a problem. Only the so-called small dense LDL particles can potentially be a problem, because they can squeeze through the lining of the arteries and if they oxidize, otherwise known as turning rancid, they can cause damage and inflammation.
Thus, you might say that there is "good LDL" and "bad LDL."
Also, some HDL particles are better than others. Knowing just your total cholesterol tells you very little. Even knowing your LDL and HDL levels will not tell you very much."