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There are two forms of lipoproteins that the liver manufactures to package dietary fats and cholesterol so that they can travel in the water-based bloodstream. These protein-studded bundles of fatty acids and cholesterol have consequences to human health, and heart health in particular. These two types of lipoprotein are HDL cholesterol and LDL cholesterol. Why are the levels of these two types of particles important to cardiovascular health?

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Answers:
Why is LDL cholesterol considered "bad"?
When too much LDL cholesterol circulates in the blood, it can slowly build up in the inner walls of the arteries that feed the heart and brain. Together with other substances it can form plaque, a thick, hard deposit that can clog those arteries. This condition is known as atherosclerosis. If a clot forms and blocks a narrowed artery, it can cause a heart attack or stroke. The levels of HDL cholesterol and LDL cholesterol in the blood are measured to evaluate the risk of having a heart attack. LDL cholesterol of less than 100 mg/dL is the optimal level. Less than 130 mg/dL is near optimal for most people. A high LDL level (more than 160 mg/dL or 130 mg/dL or above if you have two or more risk factors for cardiovascular disease) reflects an increased risk of heart disease. That's why LDL cholesterol is often called "bad" cholesterol.
Why is HDL cholesterol considered "good"?
About one-third to one-fourth of blood cholesterol is carried by high-density lipoprotein (HDL). HDL cholesterol is known as the "good" cholesterol because a high level of it seems to protect against heart attack. (Low HDL cholesterol levels [less than 40 mg/dL] increase the risk for heart disease.) Medical experts think that HDL tends to carry cholesterol away from the arteries and back to the liver, where it's passed from the body. Some experts believe that HDL removes excess cholesterol from plaque in arteries, thus slowing the buildup.

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LDL-bad cholestrol
HDL
-good ch.

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heart attacks

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