Hypercholesterolemia, or
high cholesterol, occurs when there is too much cholesterol in the
body. Cholesterol is a soft, waxy, fat-like substance that is a natural
component of all the cells of the body. Your body makes all the
cholesterol it needs. Any added cholesterol, which comes through the
foods you eat, can cause harm.
High
cholesterol raises your risk for heart disease, heart attack, and
stroke. When there is too much cholesterol circulating in the blood, it
can create sticky deposits (called plaque) along the artery walls.
Plaque can eventually narrow or block the flow of blood to the brain,
heart, and other organs. And blood cells that get caught on the plaque
form clots, which can break loose and completely block blood flow
through an artery, causing heart attack or stroke.
The
normal range for total blood cholesterol is between 140 and 200 mg per
decilitre (mg/dL) of blood (usually just expressed as a number).
However, the total number doesn't tell the whole story: There are two
types of cholesterol -- HDL (high density lipoproteins, or "good"
cholesterol) and LDL (low density lipoproteins, or "bad" cholesterol).
The amount of HDL relative to LDL is considered a more important
indicator of your heart disease risk. There is a third kind of fatty
material, triglycerides, found in the blood. They also play a role
(generally as triglyceride levels rise, "good" HDL cholesterol falls).
When you have high cholesterol, it usually means you have high levels of
LDL cholesterol, normal or low levels of HDL cholesterol, and normal
or high levels of triglycerides.
More
Americans are diagnosed with high cholesterol every year. While
heredity may be a factor for some people, the main culprits are lack of
exercise and diets high in saturated fat. High cholesterol can be
prevented, sometimes with lifestyle changes (diet and exercise) alone.
If these do not work, your doctor may recommend medications to lower
your cholesterol levels.
Signs and Symptoms:
There
usually aren't any symptoms of high cholesterol, especially in early
stages. The only way to tell if your cholesterol is high is through a
blood test.
Causes:
In
some cases, high cholesterol levels may be inherited -- your liver may
make too much cholesterol, or your body may not remove LDL from your
blood as efficiently as normal. High cholesterol or triglycerides can
also be associated with other diseases, such as diabetes. But most often
high cholesterol is caused by eating foods high in saturated fat and
not getting enough exercise. High cholesterol is more common in people
who are overweight or obese, a condition that affects almost half of
U.S. adults.
Risk Factors:
Some
factors increase a person's risk of having high cholesterol. While
some of these cannot be changed, many can be. The most important risk
factors for high cholesterol are:
- Being overweight or obese
- Eating a diet high in saturated fat and trans fatty acids (found in processed and fried foods)
- Not getting enough exercise
- Family history of heart disease
- High blood pressure
- Smoking
- Diabetes
Diagnosis:
Most
people don't have any symptoms of high cholesterol. A blood test is
the only way to check levels of cholesterol in your blood. If your
levels are above 200 mg/dL or your HDL is below 40, your doctor may do a
fasting lipid profile (a test performed after you abstain from food
for 12 hours).
Although
cholesterol levels above 200 are generally considered high, what's
considered safe for each person depends on whether you are at risk for,
or have, heart disease.
Total cholesterol levels:
- Desirable: Below 200 mg/dL
- Borderline high: 200 - 239
- High: Above 240
LDL cholesterol levels:
- Optimal for people with heart disease or who are at high risk: Below 70 mg/dL
- Optimal for people at risk of heart disease: Below 100
- Optimal: 100 - 129
- Borderline high: 130 - 159
- High: 160 - 189
HDL cholesterol levels:
- Poor: Below 40 mg/dL
- Acceptable: 40 - 59
- Optimal: 60 or above
Triglyceride levels:
- Optimal: Below 150 mg/dL
- Borderline high: 150 - 199
- High: Above 200
Adults with normal
total and HDL cholesterol levels should have their cholesterol checked
every 5 years. If you have high cholesterol, you should be checked
every 2 - 6 months. You should have liver function tests as well if you
are on cholesterol-lowering medication.
Preventive Care:
Most people can lower cholesterol levels by eating a well balanced diet, getting regular exercise, and losing any excess weight.
Diet
A
healthy diet can help you lose any extra pounds. Even losing just 5 or
10 pounds may help lower your cholesterol. To eat a healthy diet:
- Cut down on saturated fats and trans fats. No more than 10% of your daily calories should come from saturated fat, and you should avoid trans fats completely. Based on data from 4 studies, it is estimated that a 2% increase in energy intake from trans fats increases the incidence of heart disease by 23%. Choose unsaturated fats, such as olive oil and canola oil, instead.
- Eat whole grains -- whole wheat bread and pasta, oatmeal, oat bran, and brown rice.
- Eat more fruits and vegetables, which are high in fiber and can help lower cholesterol levels. Studies show that plant based diets are associated with decreases in total cholesterol and LDL cholesterol of up to 15%.
- Limit cholesterol in your diet. The highest amounts are found in egg yolks, whole milk products, and organ meats.
- Eat fatty fish. The American Heart Association recommends that people eat at least 2 servings of fatty fish (such as salmon or herring) each week.
- Eat phytosterols and stanols found in nuts, seeds, vegetable oils, and fortified food products, such as orange juice, yogurt, margarine spreads, and salad dressing. Studies show that eating spreads enriched with phytosterols per day reduced total cholesterol by up to 11% and LDL cholesterol by up to 15%.
The American Heart
Association (AHA) has developed dietary guidelines that help lower fat
and cholesterol intake and reduce the risk of heart disease. The AHA
does not recommend very low fat diets, because new research shows that
people benefit from unsaturated ("good") fats, such as those found in
olive oil, in their diet.
Many
fad diets are popular, but they may not help you lose weight and keep
it off -- and in some cases, they may not even be healthy. Any healthy
diet will include a variety of foods. If a diet bans an entire food
group (such as carbohydrates), it's probably not healthy.
For healthy eating, eat a balanced diet that emphasizes fruit and vegetables:
- Grains: 6 - 8 servings per day (half should be whole grains)
- Vegetables: 3 - 5 servings per day
- Fruits: 4 - 5 servings per day
- Fat free or low fat dairy: 2 - 3 servings per day
- Lean meat, poultry, seafood: 3 - 6 oz. per day (about the size of a deck of cards)
- Fats and oils: 2 - 3 tbsp. per day (use unsaturated fats such as olive oil or canola oil)
- Nuts, seeds, legumes: 3 - 5 servings per week
- Sweets, sugars: 5 or fewer servings per week (the fewer, the better)
In addition, the
American Heart Association also recommends eating 2 servings of fatty
fish (such as salmon, herring, or lake trout) per week; holding sodium
(salt, including salt already added to food) to less than 2,400 mg per
day; and limiting alcohol intake to 1 drink a day for women and 2 for
men. However, moderate alcohol consumption may help lower triglyceride
levels and increase HDL levels.
The TLC (therapeutic lifestyle changes) diet
is recommended for people who have high cholesterol. With the TLC
diet, less than 7% of your daily total calories should come from
saturated fat, and only 25% -35% of your daily calories should come
from fat, overall. Sodium should be limited to 2,400 mg per day. If
these steps don't lower your cholesterol, your doctor may suggest
adding more soluble fiber to your diet, along with plant sterols (found
in cholesterol lowering margarines and salad dressings).
The Mediterranean style diet
concentrates on whole grains, fresh fruits and vegetables, fish, olive
oil, and moderate, daily wine consumption. This diet is not low fat.
It is low in saturated fat but high in monounsaturated fat. This diet
is naturally rich in fiber, antioxidants, and omega-3 fatty acids. It
appears to be heart healthy: In a long term study of 423 patients who
had a heart attack, those who followed a Mediterranean style diet had a
50 - 70% lower risk of recurrent heart disease compared with people who
received no special dietary counseling.
Losing Weight
Being
overweight increases risk of high cholesterol and heart disease. Even a
5 - 10 pound weight loss can lower LDL twice as much as diet alone.
Weight loss often results in lower triglyceride levels and increased
HDL, too. To maintain a healthy diet, you should aim for a gradual,
weekly weight loss of 1/2 to 1 pound.
Getting Exercise
Regular
exercise both reduces the risk of death from heart disease and helps
lower LDL cholesterol levels, especially when combined with a healthy
diet. Just 30 minutes of moderate exercise 5 times per week can help you
lose weight or maintain a proper weight, reduce LDL and triglyceride
levels, and increase levels of HDL. And studies show that for every 10
minute prolongation of exercise per session is associated with a 1.4
mg/dL increase in HDL cholesterol. Exercise may also lower blood
pressure. Talk with your doctor before starting a new exercise plan.
Treatment Approach:
Lowering
your cholesterol level reduces your risk of heart disease and stroke.
Studies have shown that for every 1% reduction in cholesterol levels
there is a 2% reduction in the rate of heart disease. People who already
have heart disease or are at higher risk benefit most from lowering
their cholesterol.
Changes
in lifestyle -- improved diet, more exercise -- are the most effective
means of both preventing and, in less severe cases, treating high LDL
cholesterol levels. In addition to recommending lifestyle changes,
physicians often prescribe specific cholesterol lowering medications.
Medications
If
your LDL cholesterol remains high, after changing your diet and
exercise habits, your doctor may prescribe medications to lower it. If
your cholesterol is very high (more than 200 mg/dL), you may start drug
therapy at the same time you improve your diet and exercise habits.
Drugs commonly used to treat high cholesterol include:
Statins
-- These are usually the drugs of choice as they are easy to take and
have few interactions with other drugs. Side effects can include
myositis (inflammation of the muscles), joint pain, stomach upset, and
liver damage. People who are pregnant or have liver disease should not
take statins. Statins include:
- Lovastatin (Mevachor)
- Pravastatin (Pravachol)
- Rosuvastatin (Crestor)
- Simvastatin (Zocor)
- Atorvastatin (Lipitor)
- Fluvastatin (Lescor)
Niacin (nicotinic
acid) -- In prescription form, niacin is sometimes used to lower LDL
cholesterol. It can be more effective in raising HDL cholesterol than
other medications. Side effects may include redness or flushing of the
skin (which can be reduced by taking aspirin 30 minutes before the
niacin), stomach upset (which usually subsides in a few weeks),
headache, dizziness, blurred vision, and liver damage. Dietary
supplements of niacin should not be used instead of prescription niacin,
as it can cause side effects. Only take niacin for high cholesterol
under a doctor's supervision.
Bile
acid sequestrants -- These are used to treat high levels of LDL.
Common side effects include bloating, constipation, heartburn, and
elevated triglycerides. People who have high levels of triglycerides
(fats in the blood) should not take bile acid sequestrants. These drugs
include:
- Cholestyramine (Prevalite, Questran)
- Colestipol (Colestid)
- Colesevelam (WelChol)
Cholesterol absorption
inhibitors -- The medication ezetimibe (Zetia) limits how much LDL
cholesterol can be absorbed in the small intestine. Side effects
include headaches, nausea, muscle weakness. Ezetimibe is combined with
simvastatin in the drug Vytorin.
Fibric
acid derivatives -- These medicines are effective at lowering
triglyceride levels, and moderately effective at lowering LDL. They are
used to treat high triglycerides and low HDL in people who cannot take
niacin. Side effects include myositis, stomach upset, sun sensitivity,
gallstones, irregular heartbeat, and liver damage.
- Gemfibrozil (Lopid)
- Fenofibrate (Tricor, Lofibra)
If you do not respond to one class of drugs, you doctor may use a combination of drugs from 2 classes.
Nutrition and Dietary Supplements
In
addition to eating a healthy diet -- low in saturated fat, with plenty
of whole grains, fruits, and vegetables -- some specific foods and
supplements may help lower cholesterol.
Fiber
-- Several studies have shown that soluble fiber (found in beans, oat
bran, barley, apples, psyllium, flaxseed, and glucomannan) lowers LDL
cholesterol and triglycerides. Fiber can also help you lose weight
because it makes you feel full faster. Your doctor will encourage you to
get more fiber in your diet. You may also take a fiber supplement. Men
should get 30 - 38 g of fiber per day. Women should get 21 - 25 g.
Beta-glucan
-- is a type of soluble fiber found in oat bran and other plants. It
slightly reduces LDL cholesterol, which is why oat bran is touted as a
cholesterol reducing food.
Soy
-- Many studies have shown that eating soy protein (tofu, tempeh,
miso), rather than animal meat, helps lower blood cholesterol levels,
especially when you eat a diet low in saturated fat. One study found
that as little as 20 g of soy protein per day is effective in reducing
total cholesterol, and that 40 - 50 g shows faster effects (in 3 weeks
instead of 6). Another study showed that soy can help reduce
triglyceride levels. The AHA recommends that people with elevated total
and LDL cholesterol add soy to their daily diet, and that soy is safe
when consumed as part of your regular diet. Before you take soy
supplements, however, talk to your doctor. Soy isoflavones may have
estrogen like effects on the body, which might lead to an increased risk
of breast and other cancers.
Omega-3
fatty acids, found in fish oil -- There is good evidence that omega-3
fatty acids (namely EPA and DHA) found in fish oil can help prevent
heart disease, lower blood pressure, and reduce the level of
triglycerides (fats) in the blood. However, fish oil can also raise
levels of both HDL and LDL slightly. When taken as a supplement, it can
also act as a blood thinner, so people who already take blood thinning
medication should only take a fish oil supplement under their doctor's
supervision. One preliminary study found that people with high
cholesterol who took fish oil and red yeast rice lowered cholesterol
levels about as much as people who took simvastatin (Zocor). The AHA
recommends that people eat at least 2 servings of fatty fish (such as
salmon) per week, and that fish is safe when consumed as part of your
regular diet. If you have high cholesterol, talk to your doctor before
taking a fish oil supplement.
Alpha-linolenic
acid (ALA) -- ALA is another omega-3 fatty acid that may protect the
heart against heart disease. However, studies have shown conflicting
results about its ability to lower LDL, and it does not appear to lower
triglyceride levels.
Vitamin
C (100 - 200 mg per day) -- Several studies suggest that eating a diet
high in vitamin C can help lower cholesterol levels, but there is no
evidence that taking extra vitamin C through a supplement will help.
Beta-sitosterol
(800 mg to 6 g per day in divided doses about 30 minutes before meals)
-- Beta-sitosterol is a plant sterol, a compound that can stop
cholesterol from being absorbed by the intestines. Several well designed
scientific studies have shown that beta-sitosterol does lower "bad"
LDL cholesterol levels in the body. Beta-sitosterol may lower the
amount of vitamin E and beta-carotene absorbed by the body, so you may
want to ask your doctor if you need to take extra vitamin E or
carotene.
Policosanol
(5 - 10 mg 2 times per day) -- Policosanol is a mix of waxy alcohols
usually derived from sugar cane and yams. Several studies have indicated
it may lower "bad" LDL cholesterol and maybe even raise "good" HDL
cholesterol. One study found that policosanol was equivalent to
fluvastatin (Lescol) and simvastatin (Zocor) in lowering cholesterol
levels. It may also inhibit blood clots from forming. However, almost
all the studies have been conducted in Cuba or Latin America using a
proprietary form of policosanol, so it is hard to evaluate the evidence.
Policosanol may increase the risk of bleeding, and should not be taken
by people who also take blood thinning medication.
Coenzyme
Q10 (CoQ10) -- Researchers believe that CoQ10 may boost levels of
antioxidants. One study found that people who received daily CoQ10
supplements within 3 days of a heart attack were much less likely to
experience subsequent heart attacks and chest pain. They were also less
likely to die of the condition than those who did not receive the
supplements. Still, more research is needed to say whether CoQ10 has any
role in preventing or treating atherosclerosis. People who take
statins may have low levels of CoQ10. If you take statins, you may want
to ask your doctor about taking a CoQ10 supplement. CoQ10 can
interfere with anticoagulant / antiplatelet drugs.
Polyphenols
-- Polyphenols are chemical substances found in plants that have
antioxidant properties. Test tube, animal, and some population based
studies suggest that the flavonoids quercetin, resveratrol, and
catechins (all found in high concentration in red wine, and in grape
juice) may help reduce the risk of atherosclerosis by protecting against
the damage caused by LDL cholesterol. However, more studies in humans
are needed to confirm these findings.
Resveratrol
-- A study in mice found that resveratrol protected against age
related damage to vital organs, including the heart and liver, even
when the mice ate a high fat diet. Although this study is promising,
more studies are needed to see whether resveratrol would have the same
effect in humans. No one is sure how much resveratrol is needed to see a
benefit. In addition, resveratrol may have estrogen-like effects, and
researchers don't yet know whether it would pose the same risks as
estrogen supplements.
Herbs
The
use of herbs is a time honored approach to strengthening the body and
treating disease. Herbs, however, can trigger side effects and can
interact with other herbs, supplements, or medications. For these
reasons, you should take herbs with care, under the supervision of a
health care provider.
Hawthorn(Crataegus monogyna,
900 - 1,800 mg per day in 2 - 3 divided doses) -- Hawthorn contains
the polyphenols rutin and quercetin, and was used traditionally to
treat cardiovascular diseases. Animal and laboratory studies show that
hawthorn has antioxidant properties that may help lower high
cholesterol and high blood pressure. Talk to your doctor before taking
hawthorn, as it can interact with other drugs taken for heart disease
and high blood pressure.
Garlic(Allium sativum,
900 mg per day of garlic powder, standardized to 0.6% allicin) --
Previous clinical trials have shown that fresh garlic and garlic
supplements may lower cholesterol levels, prevent blood clots, and
destroy plaque. However, more recent studies show no effect on
cholesterol. Garlic can increase the risk of bleeding and should not be
taken if you are also taking blood thinning medication.
Olive leaf extract(Olea europaea,
1000 mg per day) -- One study found that people with mild high blood
pressure (hypertension) lowered cholesterol and blood pressure by taking
olive leaf extract, compared to those who took placebo. More research
is needed to confirm this study's findings.
Red yeastor red yeast rice(Monascus purpureus,
1,200 mg 2 times per day with meals) -- Several studies indicate that a
proprietary form of red yeast (Cholestin) can lower cholesterol
levels, and that the herb acts like prescription statin drugs (See
"Medications" section). For that reason, you should not take red yeast
without a doctor's supervision, especially if you already take statins
to lower cholesterol.
Psyllium(Plantago psyllium,
10 - 30 g per day in divided doses taken 30 - 60 minutes after meals)
-- Taking psyllium, a type of fiber, helps lower cholesterol levels, as
well as blood sugar levels. If you take medicine for diabetes, talk to
your doctor before taking psyllium.
Guggul (Commiphora mukul,
3 - 6 g per day) -- Guggul is used in Ayurvedic medicine to treat high
cholesterol levels. Scientific studies have found mixed results --
guggul appears to work in Indian populations, but not in people who eat
Western style, high fat diets. Guggul may have estrogen like properties
and caution should be taken with people with a history of estrogen
sensitive cancers or on hormonal medications; speak with your doctor.
Other Considerations:
Pregnancy
Cholesterol lowering medications should be avoided during pregnancy.
Prognosis and Complications
Several complications may occur if high cholesterol is left untreated. These include:
- Heart disease -- high cholesterol levels more than double the risk of heart attack. Lowering cholesterol by 1% reduces the risk of coronary artery disease by 2%.
- Stroke -- low levels of "good" HDL cholesterol have been associated with an increased risk of stroke.
- Insulin resistance -- 88% of people with low HDL and 84% with high triglycerides also have insulin resistance (which leads to high blood sugar levels). Many people with insulin resistance go on to develop diabetes.