Human: My doctor said I have high cholesterol. What are the different types of cholesterol and what can I do to lower it? Assistant: 
The three main types of cholesterol are Low-Density Lipoproteins (LDL), High-Density Lipoproteins (HDL), and Triglycerides. LDL is the bad cholesterol that can clog arteries, while HDL is the good cholesterol that helps remove LDL from the body. Triglycerides are another type of fat found in the bloodstream. Your doctor may recommend lifestyle changes such as eating a healthy diet, exercising regularly, and quitting smoking if your levels are too high. In addition, certain medications may help reduce cholesterol levels.