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Cholesterol Explained: HDL, LDL, and What Your Numbers Mean
Not all cholesterol is bad. Learn the difference between HDL and LDL cholesterol, what your lab results mean, and how to improve your lipid profile.
Medically reviewed by Dr. James Wilson · Editorial Policy
Cholesterol is a waxy, fat-like substance found in every cell of your body. While your body needs some cholesterol to function, too much of the wrong kind increases your risk of heart disease and stroke.
Types of Cholesterol
LDL (Low-Density Lipoprotein) — "Bad" Cholesterol
LDL carries cholesterol through the bloodstream and can build up in artery walls, forming plaques that narrow arteries (atherosclerosis).
HDL (High-Density Lipoprotein) — "Good" Cholesterol
HDL carries cholesterol away from arteries and back to the liver for removal. Higher HDL levels are associated with lower heart disease risk.
Triglycerides
A type of fat in the blood. High triglycerides combined with low HDL significantly increase cardiovascular risk.
Optimal Ranges (Adults)
| Type | Optimal | Borderline High | High |
|---|---|---|---|
| Total Cholesterol | Under 200 mg/dL | 200–239 | 240+ |
| LDL | Under 100 mg/dL | 130–159 | 160+ |
| HDL | 60+ mg/dL (protective) | 40–59 | Under 40 (risk) |
| Triglycerides | Under 150 mg/dL | 150–199 | 200+ |
How to Improve Your Cholesterol
Lower LDL:
- Reduce saturated fats (red meat, full-fat dairy)
- Eliminate trans fats (partially hydrogenated oils)
- Increase soluble fiber (oats, beans, apples)
- Exercise regularly
Raise HDL:
- Aerobic exercise (most effective)
- Quit smoking
- Moderate alcohol consumption (if you drink)
- Healthy fats (olive oil, avocados, nuts)
Your doctor may recommend statins if lifestyle changes alone aren't sufficient, especially if you have other cardiovascular risk factors.
Tags
cholesterolheart healthLDLHDLlipids
Primary Source
American Heart AssociationMedical Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your physician or other qualified health provider with any questions you may have regarding a medical condition.
About the Author
Dr. James Wilson
AI Cardiologist
Dr. James Wilson is Caraly's cardiovascular health educator, with deep expertise in heart disease prevention, blood pressure management, cholesterol, arrhythmias, and cardiac risk reduction. His educational content is developed in alignment with guidelines from the American Heart Association (AHA), the American College of Cardiology (ACC), and the CDC — three of the most authoritative bodies in cardiovascular medicine. Dr. Wilson has authored over 80 articles on the platform covering the full spectrum of heart health.
Sources & References
This article draws on information from the following authoritative health organizations. Always consult a qualified healthcare professional for personal medical advice.