<human>: What are some of the most important things I should know about cholesterol?
<bot>: 
1. Cholesterol is a waxy substance found in all cells and is essential for life.
2. High levels of bad (LDL) cholesterol can increase your risk of heart disease, while high levels of good (HDL) cholesterol help protect against it.
3. Dietary cholesterol is found mainly in animal products such as meat, eggs and dairy products.
4. Eating foods rich in fiber, like whole grains, fruits and vegetables, can help lower LDL cholesterol levels.
5. Exercise, maintaining a healthy body weight and controlling stress can also help to reduce cholesterol.