Cholesterol is a waxy substance found in all the body's cells, necessary for the production of hormones, vitamin D, and bile acids that help digest fats. However, high cholesterol levels can increase the risk of heart disease and strokes.

There are two main types of cholesterol: LDL, known as "bad cholesterol," which can accumulate in the arteries and increase the risk of cardiovascular disease, and HDL, known as "good cholesterol," which helps remove LDL cholesterol from the blood.

Cholesterol is measured through a blood test called a lipid profile. Desirable levels are generally less than 200 mg/dL for total cholesterol and less than 100 mg/dL for LDL.

To control cholesterol levels, lifestyle changes are recommended, such as following a diet low in saturated fats, exercising regularly, and avoiding smoking.