HDL versus LDL cholesterol. There are two main types of cholesterol: high-density lipoprotein (HDL) and low-density lipoprotein (LDL). Lipoproteins are made of fat and proteins. ... LDL is called “bad cholesterol” because it takes cholesterol to your arteries, where it may collect in artery walls. In this article, learn about the difference between HDL and LDL — “good” and “bad” — cholesterol, as well as how they are measured.HDL takes the "bad," LDL (low density lipoprotein) cholesterol out of your blood and keeps it from building up in your arteries. LDL cholesterol is known as bad cholesterol because it leads to the development and build up of plaque on the walls of your arteries.Bad cholesterol involves LDL levels that can show a link to cardiovascular risk. ... Good cholesterol, known as high-density lipoprotein (HDL), brings cholesterol from the blood and blood vessels back to the liver for processing. Bad cholesterol, known as low-density lipoprotein (LDL), circulates cholesterol to the body.When we talk about LDL and HDL cholesterol, we're actually talking about the different types of proteins that carry the cholesterol molecules.

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