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LDL cholesterol: How low can you (safely) go?

Elevated low-density lipoprotein (LDL, or “bad”) cholesterol is a clearly established risk factor for the development of cardiovascular disease (CVD). Lowering LDL with medications and/or lifestyle changes has been shown to lower CVD risk. Just how far to lower LDL, however, has remained controversial.

Current guidelines developed by the American Heart Association, American College of Cardiology, and several other professional organizations recommend lowering elevated LDL levels to 70 milligrams per deciliter (mg/dL) in people with high-risk CVD. However, recent studies have suggested that CVD risk may continue to drop as LDL is lowered beyond these targets, leading some cardiologists to believe that our current guidelines are not aggressive enough. Others are concerned that lowering LDL too much may lead to harm.

No apparent danger of very low LDL cholesterol

LDL is a key component of many hormones and all cell membranes, which allow cells to communicate with each other. Earlier studies had raised concerns that lowering LDL too far might interfere with normal cellular functions, especially in organs that have higher lipid concentrations, such as the brain and reproductive organs. And there have been reports of a slightly increased risk of osteoporosis and brain bleeding in patients treated with high doses of statin medications.

Well-known side effects in people who use statin medications include muscle aches and a slightly increased risk of diabetes, especially when high doses of medication are used. Whether these risks are due to the statin medications themselves or the lowering of LDL is not entirely clear.

However, people with rare inherited disorders in which LDL levels are extremely low (often less than 30 mg/dL) from birth appear to have normal fertility and no major organ dysfunction. Therefore, an extremely low LDL by itself does not appear to be dangerous in these unusual cases.

Study suggests lower LDL chol  » Read More

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Written by Shobha

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