Low-density lipoproteins (LDL) and high-density lipoproteins (HDL) are usually classified as “bad” (LDL) or “good” (HDL) cholesterol. But recent studies have pointed out the importance of LDL particle size. Research shows that people who have a higher quantity of small, dense LDL particles and a lower quantity of large, fluffy LDL particles have a three times greater risk of heart disease. Small, dense LDL particles are more likely to enter blood vessel walls, become oxidized, and trigger the process of atherosclerosis, which increases the risk of heart attack. Large, fluffy LDL particles, on the other hand, may be protective against heart disease.