What does cholesterol do to your body?

Depends: Cholesterol is a normal part of cell walls and is chemically related to normal hormones and other parts of the body. Too much cholesterol in the blood can build up in blood vessel walls, causing narrowing and reduced blood flow.

LDL, not Cholesterol: Cholesterol is a fat molecule manufactured by every animal cell, a building block of each cell membrane (enables membrane fluidity/movement without tearing), is fundamental to the survival of every animal cell. Lipoproteins (proteins which transport all fats in the water outside cells) is the correct issue for artery disease (e.g. ≤700 nmol/l, HDL ≥45 µmol/l). Cholesterol ↓$, but misleading.