Let's learn more about lipoproteins, which are made up of fats and proteins.

Have you ever wondered how the fat in our bodies (also called fats when we speak) moves from one place to another? Lipoproteins are special particles that help with this. Simply put, they are like little vehicles that carry things like fat and cholesterol in our bodies to where they need to be through the blood. They travel through our blood vessels. Some lipoproteins are very good for our heart, but some can cause a little bit of trouble. So, let's talk about these lipoproteins in a simple and straightforward way, just like everything else.

What exactly are cholesterol and triglycerides?

Before we talk about lipoproteins, let's understand a little about these two terms: cholesterol and triglycerides. Both are waxy fats that are found in our blood. But the way our bodies make and use them is a little different.

• Cholesterol: Most of the time, cholesterol is made in our liver. We also get cholesterol from some of the foods we eat, especially animal fats, meat, fish, and dairy products. This cholesterol is not just bad for our bodies. This cholesterol helps in making vitamin D, and important hormones like estrogen, testosterone, and cortisol . Not only that, it is also essential for making cells in our nervous system.

• Triglycerides: These are made by our liver and intestines in our digestive system. When we eat a lot of fatty, high-calorie foods, our bodies make more triglycerides. The extra triglycerides we make are stored in our fat cells. Later, when the body needs energy, these stored triglycerides are released into the blood.

Now you probably understand what cholesterol and triglycerides are and how important they are to our bodies. However, the problem is when they get too high.

What types of lipoproteins are there?

There are five main types of lipoproteins in our bodies. Let's take a look at what they are.

• High-density lipoprotein (HDL): This is what we call "good cholesterol." HDL helps carry excess cholesterol from the body back to the liver, where it is excreted. High levels of HDL reduce our risk of developing cardiovascular disease. It's like a friend to us.

• Low-density lipoprotein (LDL): This is what we call "bad cholesterol." High LDL levels increase the risk of coronary artery disease, heart attacks, and strokes. LDL carries cholesterol and deposits it in our blood vessels. When it builds up, it becomes like dirt in a pipe, reducing the space inside the blood vessels and obstructing blood flow. This condition is called atherosclerosis .

• Very low-density lipoproteins (VLDL): This is another type of "bad cholesterol." VLDL mainly carries triglycerides to our tissues. It also contributes to the transport of cholesterol to some extent.

• Intermediate-density lipoproteins (IDL): These are formed after VLDL has had some of its fatty acids removed. These IDL are then either removed by the liver or converted to LDL.

• Chylomicrons: These are the largest lipoprotein particles. They also transport triglycerides.

You see, there are different types of lipoproteins, and they do different things.

What is lipoprotein (a) or LP(a)?

This one is a little special. Lipoprotein (a) or LP(a) is also the same type of LDL, the "bad cholesterol" we talked about. But this one is special. Another protein called apolipoprotein (a) or apo(a) is wrapped around this LDL particle. This apo(a) makes the LDL particle a little "stickier". Therefore, this LP(a) can easily get deposited in the blood vessels, increasing the risk of cardiovascular problems. Having high levels of LP(a) is a major risk factor for developing atherosclerosis.

While our diet and lifestyle can affect other HDL and LDL levels, our LP(a) levels are largely determined by our genes. Some people have high LP(a) levels due to genetic mutations. Such people are at higher risk of developing heart disease at a younger age.

What is a Lipid Panel blood test?

Your doctor may have asked you to have a "lipid profile." That's what this lipid panel blood test is called. It measures the total cholesterol in your blood. It also measures the levels of HDL, LDL, and triglycerides, as well as your total cholesterol.

This is a very simple blood test. It takes less than five minutes. You can have it done at your doctor's office, at a lab, or at a hospital. For the best results, you need to fast for 8 to 12 hours before the test. That means you don't eat or drink anything. You may also be asked to stop taking any medications you are taking for a while. So be sure to follow your doctor's instructions exactly.

How and when is lipoprotein (a) [LP(a)] tested?

Usually, not everyone has their LP(a) level checked. Only if your doctor specifically requests it, will they check the LP(a) level along with the lipid panel.

This test is often only recommended for people who have certain risk factors for heart disease. These include:

• If you have had heart problems before.
• If anyone in your family, especially first-degree relatives (parents, siblings), has had heart disease at a young age.
• If your LDL level is abnormally high.
• If you have risk factors for familial hypercholesterolemia , a genetic condition that causes high LDL levels.

What is the importance of this lipid blood test?

High cholesterol often doesn't cause any symptoms, so getting this blood test is the best way to identify cholesterol problems that could be affecting your heart and blood vessels.

Doctors use this lipid blood test for things like:

• Screenings: This may be done as part of your annual medical checkup. This can help you identify if you are at increased risk for cardiovascular disease. Once you know you are at increased risk, you can take steps to prevent serious conditions like heart attack and stroke.
• Diagnosis: This cholesterol blood test also helps diagnose conditions like atherosclerosis .
• Monitoring: These test results can help you see if your cholesterol levels are getting worse, need treatment, or are responding well to treatment.

How often should these lipoprotein tests be done?

It is normal for lipoprotein and total cholesterol levels to increase with age. As your risk increases, your doctor may recommend more frequent testing.

The following are generally recommended for lipid blood tests:

• For men over 35 years old and women over 45 years old.
• Atherosclerosis is most common in men between the ages of 20 and 35 and in women between the ages of 20 and 45.
• For children, it is best to take this test once between the ages of 9 and 11, and then again between the ages of 17 and 21.

What are healthy levels of lipoproteins?

Labs measure cholesterol and lipoproteins in milligrams per deciliter (mg/dL). The methods used by each lab can vary. This means that results from the same blood sample can vary slightly from lab to lab. Whenever possible, your doctor will want to use the same lab to monitor your levels.

Healthy levels of HDL, LDL, triglycerides, and total cholesterol vary by age and gender. Talk to your doctor about what healthy levels are for you. In general, if you don't have other risk factors, these values ​​are considered healthy:

• Total cholesterol: 100-199 mg/dL for those over 21 years old; 75-169 mg/dL for those 20 years old and younger.
• HDL (good cholesterol): 45 mg/dL or higher. (55 mg/dL or higher is better for women, 45 mg/dL or higher for men)
• LDL (bad cholesterol): less than 100 mg/dL.
• Triglycerides: Less than 150 mg/dL.

A lipid panel can't directly measure VLDL levels, and there's no specific test for it. Instead, labs estimate your VLDL levels by dividing your triglycerides by five. A healthy VLDL level should be less than 30 mg/dL. However, this method isn't always accurate if your triglycerides are very high.

What is the normal value of lipoprotein (a) [LP(a)]?

LP(a) levels are reported in either mg/dL or nanomoles per liter (nmol/L). A value above 50 mg/dL or 75 nmol/L is considered high, and increases the risk of conditions such as atherosclerosis, heart attack, and stroke .

What are the risk factors for increasing bad cholesterol (LDL)?

Postmenopausal women and adults over 40 are at the highest risk of high LDL levels. However, even young children can have cholesterol problems. As you get older, your metabolism slows down, and your liver becomes less able to remove bad cholesterol from your body.

Race and ethnicity also play a role. Asian Americans are more likely to have elevated LDL levels, while whites are more likely to have elevated total cholesterol levels.

Other risk factors that can increase LDL levels include:

• A diet high in calories, saturated fats, and cholesterol. (We also have to think a little about the fatty, fried foods we eat.)
• Conditions like diabetes and kidney disease.
• A family history of high cholesterol.
• Excessive drinking and smoking.
• Medications like corticosteroids and some medications for high blood pressure and HIV/AIDS.
• Overweight (Obesity).

How to treat high LDL levels?

People with high LDL levels, which put them at higher risk for heart disease and stroke, often need cholesterol-lowering medications, such as statins, ezetimibe, and PCSK9 inhibitors . You can also improve these levels by making changes to your diet and lifestyle.

What can you do to improve lipoprotein levels?

Making some changes to your diet and lifestyle can help lower your bad cholesterol (LDL) and increase your good cholesterol (HDL). These steps can help:

• Be physically active for at least 150 minutes a week (that's about 30 minutes a day). Even a short walk or exercise is good.
• Eat a heart-healthy diet. That means eating foods that are low in unhealthy fats, simple sugars (carbohydrates), and high in fiber.
• Control high blood pressure and diabetes.
• Sleep well.
• Maintain a healthy weight. If you are overweight, losing 5% to 10% of your body weight can improve your cholesterol levels.
• Find healthy ways to manage stress.
• Reduce alcohol consumption.
• Ask for help to quit smoking (nicotine increases LDL levels and lowers HDL levels).

Take-Home Message:

Okay, so we've talked a lot about lipoproteins today, haven't we? Simply put, here are the main things to remember:

• Lipoproteins are like vehicles that transport fat and cholesterol in our bodies.
• HDL is "good cholesterol," which helps remove excess cholesterol from the body.
• LDL is "bad cholesterol." If it increases, it can build up in blood vessels and cause heart disease.
• LP(a) is another type of "sticky" bad cholesterol, which also increases the risk of heart disease.
• Things like your lifestyle, diet, and exercise can have a big impact on your lipoprotein levels.
• Sometimes medications (such as ``Statins'') may be needed to lower LDL and LP(a) levels and increase HDL levels.
• The most important thing is to get regular blood tests to stay informed about your levels and follow your doctor's instructions.

I hope this information helps you keep your heart healthy!

` lipoproteins, cholesterol, triglycerides, HDL, LDL, VLDL, heart disease, lipid panel, atherosclerosis, LP(a), cholesterol