Cholesterol and Where It Lurks
Burgers. Bacon. Cheese fries. What do they have in common (besides
being some people's idea of delicious)? They're all high in cholesterol.
Cholesterol, a waxy substance produced by the liver and found in
certain foods, is needed to make vitamin D and some hormones, build cell
walls, and create bile salts that help you digest fat. Actually, your
liver produces about 1,000 milligrams of cholesterol a day, enough
cholesterol so that if you never touched another cheese fry, you'd be
OK. But it's hard to avoid cholesterol entirely because so many foods
contain it.
Too much cholesterol in the body can lead to serious problems like
heart disease. Many factors can contribute to high cholesterol, but the
good news is there are things you can do to control them.
Lipids are fats that are found throughout the body. Cholesterol, a
type of lipid, is found in foods from animal sources. This means that
eggs, meats, and whole-fat dairy products (including milk, cheese, and
ice cream) are loaded with cholesterol — and vegetables, fruits, and
grains contain none.
The liver produces about 1,000 milligrams of cholesterol a day, and
you probably consume about 150 to 250 milligrams in the foods you eat.
Because cholesterol can't travel alone through the bloodstream, it
has to combine with certain proteins. These proteins act like trucks,
picking up the cholesterol and transporting it to different parts of the
body. When this happens, the cholesterol and protein form a lipoprotein
together.
The two most important types of lipoproteins are high-density lipoproteins (or HDL) and low-density lipoproteins (or LDL). You've probably heard people call LDL cholesterol "bad
cholesterol" and HDL cholesterol "good cholesterol" because of their
very different effects on the body. Most cholesterol is LDL cholesterol,
and this is the kind that's most likely to clog the blood vessels,
keeping blood from flowing through the body the way it should. On the other hand, HDL cholesterol removes cholesterol from the blood
vessels and carries it back to the liver, where it can be processed and
sent out of the body.
Why Do People Worry About High Cholesterol?
When you have too much cholesterol, it can be dangerous to your
health. When LDL cholesterol levels are high, cholesterol is deposited
on the walls of arteries and forms a hard substance called plaque. Over time, plaque causes the arteries to become narrower, decreasing blood flow and causing a condition called atherosclerosis (pronounced: ah-thuh-ro-skluh-ro-sis), or hardening of the arteries.
When atherosclerosis affects the coronary arteries (the blood vessels
that supply the muscles of the heart), the condition is called coronary artery disease,
which puts a person at risk for having a heart attack. When
atherosclerosis affects the blood vessels that supply the brain, the
condition is called cerebral vascular disease, which puts a person at risk of having a stroke.
Atherosclerosis may also block blood flow to other vital organs,
including the kidneys and intestines. This is why it's so important to
start paying attention to cholesterol levels as a teen — you can delay
or prevent serious health problems in the future.
What Causes High LDL Cholesterol Levels?
Some of the factors that can lead to high cholesterol are:
- Overweight — Excess weight has been linked with high cholesterol levels.
- Heredity — If cholesterol problems or heart disease run in your family, you are at a higher risk for having problems.
- Diet — Remember the saying "you are what you eat"? Avoid foods that are high in cholesterol, saturated fat, and trans fat, all of which increase cholesterol levels and your risk of developing heart disease.
- Age — The risk of high cholesterol increases as you get older.
Physical activity tends to increase HDL levels, which reduces your chance of developing heart disease.
What Can I Do to Lower My Cholesterol?
Some people who have high cholesterol levels need to be on medication as part of their treatment to lower it. Although most teens won't need to take medication to lower their cholesterol, it's still important to keep cholesterol in check because plaques can start to form during the teen years. To see if you have high cholesterol, talk to your doctor, who can test your cholesterol levels by drawing a sample of your blood.
You can't change your genes but there are things you can do now to decrease your risk for heart disease later.
The American Heart Association recommends that cholesterol intake should be less than 300 milligrams a day, total fat intake should be 30% or less of your total calories, saturated fat should be 10% or less of the total daily calories, and trans fats should be less than 1% of the total calories you consume.
Also, maintain a healthy weight and get moving. Regular aerobic exercise — stuff like biking, walking, and swimming — strengthens your heart, lowers cholesterol, and helps you to lose excess weight. For people who smoke, quitting can help decrease the risk of heart disease.
Healthy Tips
Here are some helpful tips you can try:
- Eat a diet that contains many low-cholesterol foods: fruits, veggies, whole grains (like breads and cereals), legumes (beans), and fish.
- Eat a diet that is low in saturated and trans fat. Replace saturated and trans fats with unsaturated fats. Use liquid vegetable oil or trans fat-free margarine instead of butter, shortening, or stick margarine. Stay away from products that contain hydrogenated vegetable oils.
- If you eat meat, try using lean meats and skinless poultry. Make sure you trim off all noticeable fat before cooking and drain the fat from the pan after browning meats.
- Instead of frying, try boiling, broiling, baking, roasting, poaching, steaming, or sautéing.
- Instead of whole milk, use low-fat or nonfat milk, which contains all the nutrients without all the fat. Choose other low-fat or nonfat dairy products including yogurt, cheese, and cottage cheese. You can also substitute low-fat buttermilk or yogurt in recipes that call for cream cheese or sour cream.
- Use trans-fat-free margarine.
- Instead of meat, use different sources of protein including fish, beans, peas, nuts, and tofu or other soy products.
- Instead of eggs, try just egg whites or cholesterol-free commercial egg substitutes.
- Pass on commercially prepared baked goods, which are often made with hydrogenated oils or trans fats.
- Looking for snacks that are low in fat and cholesterol? Try fruits, raw veggies and low-fat dips, low-fat whole-grain crackers, plain unsalted popcorn or pretzels, gelatin, or low-fat yogurt.
http://kidshealth.org/teen/food_fitness/nutrition/cholesterol.html
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