Cholesterol is a waxy, fat-like substance found in your blood and all your body's cells. It's essential for building healthy cells, making hormones and vitamin D, and aiding in digestion. Your body makes all the cholesterol it needs, but it also comes from animal-based foods. There are two main types: LDL (low-density lipoprotein), often called "bad" cholesterol, and HDL (high-density lipoprotein), or "good" cholesterol. High levels of LDL cholesterol can lead to a buildup of plaque in your arteries, increasing the risk of heart disease and stroke