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LDL Cholesterol: Levels, Causes and Treatment

LDL cholesterol is known as bad cholesterol. High levels can lead to plaque buildup in arteries, increasing the risk of heart attack and stroke.

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Things worth knowing about "ldl cholesterol"

LDL cholesterol is known as bad cholesterol. High levels can lead to plaque buildup in arteries, increasing the risk of heart attack and stroke.

What is LDL Cholesterol?

LDL cholesterol stands for Low-Density Lipoprotein cholesterol. It is one of the main types of cholesterol found in the blood and is commonly referred to as bad cholesterol. LDL carries cholesterol from the liver to cells throughout the body. When LDL levels are too high, excess cholesterol can accumulate in the walls of blood vessels, leading to serious cardiovascular conditions.

Role of LDL Cholesterol in the Body

Cholesterol is an essential substance needed for building cell membranes, producing hormones such as estrogen and testosterone, and synthesizing bile acids that aid digestion. LDL is responsible for transporting cholesterol through the bloodstream to tissues that need it. However, elevated LDL levels can become harmful when cholesterol deposits build up inside artery walls.

Causes of High LDL Cholesterol

Unhealthy diet: High intake of saturated fats and trans fats (found in fast food, fatty meats, baked goods)
Physical inactivity: Lack of exercise reduces HDL (good cholesterol) and may raise LDL
Overweight and obesity: Excess body fat negatively affects lipid metabolism
Genetic factors: Familial hypercholesterolemia is an inherited condition causing significantly elevated LDL levels
Medical conditions: Type 2 diabetes, hypothyroidism, kidney disease, and liver disease can increase LDL
Medications: Certain drugs such as corticosteroids or specific blood pressure medications may raise LDL levels

Health Risks of Elevated LDL Cholesterol

Persistently high LDL cholesterol leads to atherosclerosis -- the buildup of fatty deposits called plaques inside the artery walls. This narrows the arteries and restricts blood flow, potentially causing:

Heart attack (coronary artery disease)
Stroke
Peripheral artery disease (PAD)

Diagnosis: Measuring LDL Cholesterol

LDL cholesterol is measured through a simple blood test, typically as part of a full lipid panel. It is recommended to fast for at least 9 to 12 hours before the test for accurate results.

LDL Cholesterol Reference Values

Optimal (healthy adults): below 100 mg/dL
Near optimal: 100-129 mg/dL
Borderline high: 130-159 mg/dL
High: 160-189 mg/dL
Very high: 190 mg/dL and above
High-risk patients (e.g., after heart attack): Target below 55-70 mg/dL per ESC guidelines

Treatment and Lowering LDL Cholesterol

Lifestyle Changes

Dietary adjustments: Reduce saturated fats, increase fiber, fruits, and vegetables
Regular physical activity (at least 150 minutes of moderate exercise per week)
Weight loss in cases of overweight or obesity
Smoking cessation
Limiting alcohol consumption

Medication

Statins: First-line treatment for lowering LDL (e.g., atorvastatin, simvastatin, rosuvastatin)
Ezetimibe: Reduces cholesterol absorption in the intestine, often combined with statins
PCSK9 inhibitors: Modern antibody therapies for high-risk patients or those intolerant to statins (e.g., evolocumab, alirocumab)
Fibrates and niacin: Additional options for managing lipid disorders

References

European Society of Cardiology (ESC) / European Atherosclerosis Society (EAS): 2019 ESC/EAS Guidelines for the management of dyslipidaemias. European Heart Journal, 2019.
World Health Organization (WHO): Cardiovascular diseases (CVDs) - Fact Sheet. WHO, 2021. Available at: https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-(cvds)
Grundy, S. M. et al.: 2018 AHA/ACC Guideline on the Management of Blood Cholesterol. Journal of the American College of Cardiology, 2019.

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