Cholesterol is a waxy, fat-like substance your liver produces naturally and that's also found in some foods. Your body needs it to build cell membranes, produce hormones, and make vitamin D.

But the balance between its different carrier types in the blood determines whether it helps or harms your arteries.

LDL, HDL, and Triglycerides

LDL, often called "bad" cholesterol, carries cholesterol to the arteries where it can build up as plaque. HDL, the "good" cholesterol, carries excess cholesterol back to the liver for removal.

Triglycerides are a separate type of blood fat that store unused calories, and elevated levels combined with high LDL raise cardiovascular risk.

What Affects Your Numbers

Genetics play a large role — familial hypercholesterolemia is an inherited condition — alongside diet (saturated and trans fats raise LDL), physical activity (which raises HDL), body weight, and smoking.

A routine lipid panel blood test measures total cholesterol, LDL, HDL, and triglycerides together to give a fuller picture of cardiovascular risk.

Sources

  1. Wikipedia — overview of cholesterol biology
  2. American Heart Association — guidance on cholesterol and cardiovascular health
  3. CDC — cholesterol testing and risk information

FAQ

What is considered a healthy total cholesterol level?

General guidance from health bodies is a total cholesterol under 200 mg/dL, though the LDL/HDL breakdown matters more than the total number, and targets should be reviewed with a doctor.

Can cholesterol be too low?

Very low cholesterol is uncommon and can, in rare cases, be linked to other health issues, but for most people the practical concern is elevated LDL, not levels being too low.

Does diet alone control cholesterol?

Diet is a major factor, but genetics can dominate for some people, which is why doctors sometimes prescribe medication like statins even for those who eat well.

About the Author

We reference Wikipedia and the American Heart Association and the CDC to explain the background and current understanding of this topic.

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