Have you ever wondered what the difference between "good" and "bad" cholesterol is? Well, you're certainly not alone. Many people want to know why low-density lipoprotein (LDL, or "bad" cholesterol) is bad, while high-density lipoprotein (HDL, or "good" cholesterol) is good. We will see in a moment. Lipoproteins are molecular aggregates of lipids (which are fat-soluble molecules) and proteins. Cholesterol is a lipid and therefore does not dissolve in blood, which is mostly water. To be transported throughout the body from its source in the liver, it must be incorporated into lipoproteins, which do dissolve in blood. Thus, all the cholesterol in your bloodstream is a component of one kind of lipoprotein or another.
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