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Cholesterol


What is cholesterol ?

Cholesterol is a soft, waxy, fatty substance found in the bloodstream and in body cells. It is used to form cell membranes and hormones in the body of animals. Cholesterol can't dissolve in the blood. It is transported by carriers called lipoproteins, which can be LDL ( low-density lipoprotein ), VLDL ( very low-density lipoprotein ) and HDL ( High-density lipoprotein ).


1. What is LDL cholesterol ?

Low-density lipoprotein is the major cholesterol carrier in the blood. It transports fat to the muscles, heart, fat stores and other tissues. If too much LDL cholesterol circulates in the blood, it can slowly build up in the walls of arteries feeding the heart and brain. Together with other substances it can form plaque, a thick, hard deposit that can clog arteries (atherosclerosis).


2. What is HDL cholesterol ?

HDL tends to carry cholesterol away from the arteries and back to the liver for recycling and/or excretion through bile. HDL cholesterol is known as "good" cholesterol because HDL removes cholesterol from arteries and blood and transports it to the liver for breakdown and disposal or use in such purposes as the starting point for the manufacture of hormones. A high HDL cholesterol level seems to protect against heart attacks, while a low HDL cholesterol level is linked to higher risks of strokes and heart attacks.


3. What about cholesterol and diet ?

Cholesterol in the human blood originates from two major sources. The liver typically produces all the cholesterol the body needs and it is not necessary to take in any additional cholesterol from food. Secondly, cholesterol is obtained from dietary items like egg yolks, fatty meats, fish, seafood, whole milk, ice cream and dairy products. Saturated fatty acids and trans fats are the main culprits in raising blood cholesterol. The American Heart Association recommends that average daily cholesterol intake be limited to less than 300mg. If heart disease has been diagnosed, limit the daily intake to less than 200mg.


4. How does genetic affect cholesterol level ?

Genes influence LDL cholesterol levels by affecting how speed of fabrication and removal from the blood. Inherited hypercholesterolemia affects 1 in 500 people, which is why some people with a cholesterol free diet show high blood cholesterol levels.


5. How does physical activity affect cholesterol levels ?

Regular physical activity may lower LDL cholesterol and raise HDL cholesterol levels. Physical activity can also help to reduce excess weight, diabetes and high blood pressure. Inactivity is a major risk factor for heart disease. Even moderate-intensity activities, if done daily, help reduce the risk. Examples include walking for pleasure, gardening, yard work, housework, dancing and prescribed home exercise. People who reduce their body weight also reduce their blood cholesterol levels.


6. How does smoking affect cholesterol levels ?

Smoking increases LDL cholesterol levels while HDL-cholesterol goes down, resulting in an unfavorable HDL/LDL ratio. It also increases the tendency for blood to clot and may provoke a heart attack. In addition, tobacco smoke contains chemical components which cause serious damage to blood vessels.


7. How does alcohol affect cholesterol levels ?

Alcohol intake increases HDL cholesterol but does not lower LDL cholesterol. If you drink, do so in moderation. People who consume moderate amounts of alcohol (an average of one to two drinks per day for men and one drink per day for women) have a lower risk of heart disease than non-drinkers. However, increased consumption of alcohol leads to other health dangers such as alcoholism, high blood pressure, obesity, stroke, cancer, suicide and damage to liver cells and the heart muscle. Because of these risks, alcoholic beverages should not be used as a way to prevent heart disease. The benefit isn't great enough to recommend drinking alcohol if you don't do so.


8. How are age and gender related to cholesterol levels ?

Before menopause, women usually have total cholesterol levels lower than those of men at the same age. As both get older, their blood cholesterol levels rise until about 60 or 65 years of age. After the age of 50, women often have higher total cholesterol levels than men of the same age.

Estrogen increases HDL cholesterol levels, which explains why pre-menopausal women generally have higher HDL levels than men.


9. How does stress affect cholesterol levels ?

Over the long term, stress has been shown to raise blood cholesterol levels. One way this may occur is through altered eating habits. Under stress, some people console themselves by eating more, especially ice-cream or other high cholesterol foods. The saturated fat and cholesterol in these foods contribute to higher levels of blood cholesterol. Stress also increases the risk of blood clots.


10. How does cholesterol cause heart disease ?

LDL lipoprotein deposits cholesterol on artery walls, causing the formation of a hard, thick substance called cholesterol plaque. Over time, this plaque causes thickening of the artery walls and narrowing of the arteries, a process called atherosclerosis. When coronary arteries are narrowed, they are incapable of supplying enough blood and oxygen to the heart muscle. This causes chest pain, and formation of a blood clots can completely block arteries, leading to death of heart muscle (heart attack).


11. The Benefits of Lowering Cholesterol

The Framingham Heart Study established that high blood cholesterol is a risk factor for coronary heart disease (CHD). The higher the cholesterol level, the greater the CHD risk. Recent studies have shown that lowered cholesterol l reduced the number of heart attacks and deaths in people with high blood cholesterol levels. The need for bypass surgery or angioplasty was also reduced significantly. The National Cholesterol Education program recommends that everyone over the age of 20 be tested for cholesterol at least once every 5 years if LDL cholesterol is less than 130 mg/dl and every 1-3 years if LDL cholesterol is borderline (between 130 to 160 mg/dl).

Blood Lipid Parameters
Blood Lipid
Desirable
Borderline
High
Total Cholesterol
< 200 mg/dl
200-239 mg/dl
≥ 240 mg/dl
LDL Low-Density Lipoproteins
< 130 mg/dl
130 - 159 mg/dl
≥ 160 mg/dl
HDL High-Density Lipoproteins
> 35 mg/dl (values >60mg/dl are considered a negative risk factor)
Triglycerides
< 200 mg/dl

The National Cholesterol Education Program

People whose total cholesterol is 240 mg/dl have twice the risk of coronary heart disease as people whose total cholesterol level is below 200 mg/dl.


12. How cholesterol levels be improved?

  • Reduce weight, or maintain a desirable weight.
    Exercise. Aerobic exercise four days per week for 30 minutes or more can increase the level of HDL cholesterol.
    Start slowly. Gradually build up to 30 minutes of activity. Perhaps try two 15-minute sessions to meet your goal.
    Pursue a variety of exercises. Walk one day, bike ride or dance the next day, swim on the weekend.

  • Cultivate healthy eating habits.
    Choose monounsaturated or polyunsaturated fats in small amounts in place of saturated fats.
    Avoid hydrogenated or trans-fatty acids. Eat fish once or twice per week.
    Eat foods low in cholesterol and cut down on high-fat foods.
    Learn to read and understand food labels to assess fat, sodium and carbohydrate levels in the diet.
    Eat lots of fruit and vegetables.
    Don’t fry foods. Instead grill, bake, roast or boil.
    Switch to low-fat yogurt, low fat spread, skimmed milk

  • Quit smoking if you are a smoker.
    Consult your doctor or take a smoking cessation programme if you are having trouble quitting.
    If you won’t stop, at least reduce the number of cigarettes you smoke.

  • Train yourself to be emotionally calm and organised.
    If you are very busy, then make a daily list if things to do. A list helps us to be more efficient and have more time to relax.

  • Consume nutrional supplements known to reduce cholesterol eg tocotrienols, fish oil, garlic pills.

 

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