Skip to content
Know.itKnow.it
Create an animated lesson
On request

This article is free to read. Creating a lesson uses your daily or stored credits; review the language and settings before starting.

What is cholesterol?

Medicine & HealthLesson on requestFree to read

Quick answer

Cholesterol is a waxy, fat-like substance your body needs to build cells and make hormones. Your liver makes most of it, and some comes from food. The problem starts when there's too much of the 'bad' type (LDL), which can clog arteries.

Key things to understand

  1. A waxy fat your body needs in the right amount.
  2. Your liver makes most of it; food adds some.
  3. LDL is the 'bad' type that clogs arteries.
  4. HDL is the 'good' type that clears it away.

People also ask

What is good vs bad cholesterol?
LDL is 'bad' — it deposits in artery walls; HDL is 'good' — it carries cholesterol away to the liver. You want low LDL and high HDL.
Why is high cholesterol dangerous?
Excess LDL builds up in arteries, narrowing them and raising the risk of heart attack and stroke.
How can I lower my cholesterol?
Eat more fibre and healthy fats, cut saturated and trans fats, stay active, and follow medical advice — sometimes medication is needed.