Kolesterol is a waxy substance found in the cells of the body and in certain foods. It is essential for producing hormones, vitamin D, and substances that help digest food. The body makes all the kolesterol it needs, but it can also be obtained from animal-based foods like meat, dairy, and eggs. There are two main types of kolesterol: low-density lipoprotein (LDL) and high-density lipoprotein (HDL). LDL is often referred to as "bad" kolesterol because high levels can lead to plaque buildup in arteries, increasing the risk of heart disease. In contrast, HDL is known as "good" kolesterol because it helps remove other forms of kolesterol from the bloodstream.