It appears that in some cases, high-density lipoprotein (HDL) cholesterol, the so-called "good" cholesterol, does not protect against heart disease, and may even be harmful. A new study suggests a subclass of HDL that carries a particular protein is bad for the heart.
Previous studies have shown that high levels of HDL cholesterol are strongly linked to low risk of heart disease. But trials where people have been given drugs to increase their levels of HDL cholesterol have yielded inconsistent

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