ANSWERS: 1
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LDL stands for low-density lipoprotein, the so-called "bad" cholesterol. HDL is high-density lipoprotein, the "good" cholesterol. LDL can build up in the arteries, narrowing them. HDL seems to provide protection against heart attacks.
Source
American Heart Association: LDL and HDL Cholesterol: What's Bad and What's Good?
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