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  • sur k

    Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues, and transported in the blood plasma of all animals. The name originates from the Greek chole- (bile) and stereos (solid), and the chemical suffix -ol for an alcohol, as researchers first identified cholesterol (C27H45OH) in solid form in gallstones in 1784.

    Most cholesterol is not dietary in origin; it is synthesized internally. Cholesterol is present in higher concentrations in tissues which either produce more or have more densely-packed membranes, for example, the liver, spinal cord and brain, and also in atheroma. Cholesterol plays a central role in many biochemical processes, but is best known for the association of cardiovascular disease with various lipoprotein cholesterol transport patterns and high levels of cholesterol in the blood.

    Often, when most doctors talk to their patients about the health concerns of cholesterol, they are referring to "bad cholesterol", or low-density lipoprotein (LDL). "Good cholesterol" is high-density lipoprotein (HDL).

    Types of Cholesterol

    Cholesterol travels in the blood in "packages" called lipoproteins. Cholesterol packaged in low-density lipoprotein (LDL) is often called "bad" cholesterol, because too much LDL in blood can lead to cholesterol buildup and blockage in the arteries.

    Another type of cholesterol, which is packaged in high-density lipoprotein (HDL), is known as "good" cholesterol. That is because HDL helps remove cholesterol from the blood, preventing it from piling up in the arteries. The higher your HDL, the less your risk of coronary heart disease.

    What Are Healthy Levels of Cholesterol?
    Desirable — Less than 200 mg/dL
    Borderline high risk — 200–239 mg/dL
    High risk — 240 mg/dL and over
    Desirable
    If your total cholesterol is less than 200 mg/dL, your heart attack risk is relatively low, unless you have other risk factors. Even with a low risk, it’s still smart to eat foods low in saturated fat and cholesterol, and also get plenty of physical activity. Have your cholesterol levels measured every five years — or more often if you’re a man over 45 or a woman over 55.

    Borderline high risk
    People whose cholesterol level is from 200 to 239 mg/dL are borderline high risk. About a third of American adults are in this (borderline) group; almost half of adults have total cholesterol levels below 200 mg/dL.

    Have your cholesterol and HDL rechecked in one to two years if:

    Your total cholesterol is in this range.
    Your HDL is less than 40 mg/dL.
    You don’t have other risk factors for heart disease.
    You should also lower your intake of foods high in saturated fat and cholesterol to reduce your blood cholesterol level to below 200 mg/dL. Your doctor may order another blood test to measure your LDL cholesterol. Ask your doctor to discuss your LDL cholesterol with you. Even if your total cholesterol is between 200 and 239 mg/dL, you may not be at high risk for a heart attack. Some people — such as women before menopause and young, active men who have no other risk factors — may have high HDL cholesterol and desirable LDL levels. Ask your doctor to interpret your results. Everyone’s case is different.
    High risk
    If your total cholesterol level is 240 or more, it’s definitely high. Your risk of heart attack and stroke is greater. In general, people who have a total cholesterol level of 240 mg/dL have twice the risk of coronary heart disease as people whose cholesterol level is 200 mg/dL.

    There is no evidence that too much animal fat and cholesterol in the diet promotes atherosclerosis or heart attacks. For instance, more than twenty studies have shown that people who have had a heart attack haven’t eaten more fat of any kind than other people, and degree of atherosclerosis at autopsy is unrelated with the diet.

  • two diffrent types one good and one bad

  • Morrowynd

    Cholesterol is a kind of fat. The kind normally associated is the kind found in the arteries. There are two types, HDL-high density lipoprotien and LDL, low density lipoprotien. High density is actually good. It tends to clean out the low density. Low density doesn’t flow as easily as high and causes clots. Clots limit the amount of space in the artery and force the blood to flow faster through the body (high blood pressure). This wears the heart out. Clots can also get to the heart stopping up a valve and causing a heart attack. As for the numbers, I don’t know what you mean.

  • chingchangchickenwang

    1.a. it’s a steroid, that stacks phospholipids to make a membrane more tough. b.LDL and HDL. Low Density Lipoproteins and High Densitly Lipoproteins

    2.No, HDL is considered to be good

    3. High Cholesterol builds up on the walls of the arteries. Larger accumulations of fats and cholesterols can damage artery walls and block blood flow. And if the blood doesn’t flow through, then you’ll get chest pain and can lead to a heart attack

    4. High cholesteroal is just accumulated.. High Levels of Fat in the blood.

    5. Desirable — Less than 200 mg/dL
    Borderline high risk — 200–239 mg/dL
    High risk — 240 mg/dL and over

  • goring

    There are two types which are called HDL and LDL.
    LDL is the bad one because it cloggs up the arteries of your heart.when this happens the heart has difficulties pumping and eventually fails.

    One good thing about cholesterol is that HDL is the good one becauses it cleans the arteries of the bad one.

    A good source of HDL is olive oil ,flax seed oil and fish oils. A diet wich include these will prevent heart attacks and prolong you life but does not prevent you from dying.

  • your_doctor_online

    1) the cholesterol (CST) is a substance consisting of oxygen, carbon and hydrogen. CST , phospholipids and glycerides are the major fats in the organism. CST is used by our organism to produce cholic acid, which produces the bile salts.

    the CST combine with proteins and phospholipids to form lipoproteins. after their density, the lipoproteins are: chylomicrons (the lowest density lipoprot), very low density lipoproteins (VLDL), low density (LDL), intermediate density (IDL) and high density (HDL).

    2) if we consider all the lipoproteins containing CST, not all of them are bad. high levels of LDL are bad for our body, but the HDL protect us agains athersclerosis, atheromatosis, and almost all cardiovascular diseases.

    3) the high levels of LDL are bad for our body, because it is forming plaques containing CST and other lipid material in the arteries. this makes the arterial lumen (interior diameter) to be smaller, and from here we can get the hipertensive disease, or coronarian artery disease(CAD), ischemia. So the CST can affect the heart.

    4)high CST means a level >200 mg/dl in harrison’s textbook of interal medicine or >190 mg/dl in some other books

    5) the levels must be!!

    CST < 190 mg/dl
    HDL > 60 mg/ dl
    triglycerides < 160 mg/dl

    take care!!

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