What
Is Cholesterol?
If you're
overweight or obese, you're at increased risk of having abnormal levels of
blood fats. These include high levels of triglycerides and LDL
("bad") cholesterol and low levels of HDL ("good")
cholesterol.
To understand high blood
cholesterol, it helps to learn about cholesterol. Cholesterol is a waxy,
fat-like substance that’s found in all cells of the body.
Your body
needs some cholesterol to make hormones, vitamin D, and substances that help
you digest foods. Your body makes all the cholesterol it needs. However,
cholesterol also is found in some of the foods you eat.
Cholesterol
travels through your bloodstream in small packages called lipoproteins
(lip-o-PRO-teens). These packages are made of fat (lipid) on the inside and
proteins on the outside.
Two kinds
of lipoproteins carry cholesterol throughout your body: low-density
lipoproteins (LDL) and high-density lipoproteins (HDL). Having healthy levels
of both types of lipoproteins is important.
LDL
cholesterol sometimes is called “bad” cholesterol. A high LDL level leads to a
buildup of cholesterol in your arteries. (Arteries are blood vessels that carry
blood from your heart to your body.)
HDL
cholesterol sometimes is called “good” cholesterol. This is because it carries
cholesterol from other parts of your body back to your liver. Your liver
removes the cholesterol from your body.
What
Is High Blood Cholesterol?
High
blood cholesterol is a condition in which you have too much cholesterol in your
blood. By itself, the condition usually has no signs or symptoms. Thus, many
people don’t know that their cholesterol levels are too high.
People
who have high blood cholesterol have a greater chance of getting coronary heart disease, also called coronary artery disease. (In this article, the term
“heart disease” refers to coronary heart disease.)
The
higher the level of LDL cholesterol in your blood, the GREATER your chance is
of getting heart disease. The higher the level of HDL cholesterol in your
blood, the LOWER your chance is of getting heart disease.
Coronary
heart disease is a condition in which plaque builds up inside the
coronary (heart) arteries. Plaque is made up of cholesterol, fat, calcium, and
other substances found in the blood. When plaque builds up in the arteries, the
condition is called atherosclerosis.
PICTURE SPEAKS - From the image figure above:
Figure A shows the location of the heart in the
body.
Figure B shows a normal coronary artery with
normal blood flow. The inset image shows a cross-section of a normal coronary
artery.
Figure C shows a coronary artery narrowed by
plaque. The buildup of plaque limits the flow of oxygen-rich blood through the
artery. The inset image shows a cross-section of the plaque-narrowed artery.
Over
time, plaque hardens and narrows your coronary arteries. This limits the flow
of oxygen-rich blood to the heart.
Eventually,
an area of plaque can rupture (break open). This causes a blood clot to form on
the surface of the plaque. If the clot becomes large enough, it can mostly or
completely block blood flow through a coronary artery.
If the
flow of oxygen-rich blood to your heart muscle is reduced or blocked, angina or a heart attack may
occur.
Angina is
chest pain or discomfort. It may feel like pressure or squeezing in your chest.
The pain also may occur in your shoulders, arms, neck, jaw, or back. Angina
pain may even feel like indigestion.
A heart
attack occurs if the flow of oxygen-rich blood to a section of heart muscle is
cut off. If blood flow isn’t restored quickly, the section of heart muscle
begins to die. Without quick treatment, a heart attack can lead to serious
problems or death.
Plaque
also can build up in other arteries in your body, such as the arteries that
bring oxygen-rich blood to your brain and limbs. This can lead to problems such
as carotid artery disease, stroke,
and peripheral artery disease.
Medical
Objective
Lowering
your cholesterol may slow, reduce, or even stop the buildup of plaque in your
arteries. It also may reduce the risk of plaque rupturing and causing dangerous
blood clots.
What Causes High Blood Cholesterol?
Many factors can affect
the cholesterol levels in your blood. You can control some factors, but not
others.
Diet
Cholesterol is found in
foods that come from animal sources, such as egg yolks, meat, and cheese. Some foods
have fats that raise your cholesterol level.
For example, saturated fat
raises your low-density lipoprotein (LDL) cholesterol level more than anything
else in your diet. Saturated fat is found in some meats, dairy products,
chocolate, baked goods, and deep-fried and processed foods.
Trans fatty
acids (trans fats)
raise your LDL cholesterol and lower your high-density lipoprotein (HDL)
cholesterol. Trans fats
are made when hydrogen is added to vegetable oil to harden it.Trans fats
are found in some fried and processed foods.
Limiting foods with
cholesterol, saturated fat, and trans fats can help you control your
cholesterol levels.
Physical
Activity and Weight
Lack of physical activity
can lead to weight gain. Being overweight tends to raise your LDL level, lower
your HDL level, and increase your total cholesterol level. (Total cholesterol
is a measure of the total amount of cholesterol in your blood, including LDL
and HDL.)
Routine physical activity can help you lose weight and
lower your LDL cholesterol. Being physically active also can help you raise
your HDL cholesterol level.
Other factors that
can raise your triglyceride (Bad Cholesterol) level include:
- Cigarette smoking
- Excessive alcohol use
- A very high carbohydrate diet
- Certain diseases and medicines
- Some genetic disorders
High blood cholesterol is
treated with lifestyle changes and medicines. The main goal of treatment is to
lower your low-density lipoprotein (LDL) cholesterol level enough to reduce your
risk for coronary heart
disease, heart attack, and other related health
problems.
Your risk
for heart disease and heart attack goes up as your LDL cholesterol level rises
and your number of heart
disease risk factors increases.
Some
people are at high risk for heart attacks because they already have heart
disease. Other people are at high risk for heart disease because they
have diabetes or more than one heart disease risk factor.
Prevention, treatment and
management of High blood cholesterol start with engaging in heart-healthy
lifestyle changes.
Heart-healthy
lifestyle changes include:
- Heart-healthy
eating
- Maintaining
a healthy weight
- Managing
stress
- Physical
activity
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ReplyDeleteregards,
Nurse and Medical Careers