LDL isn't bad cholesterol—it's a delivery truck that brings cholesterol where the body needs it.

High cholesterol might not be the main reason for heart disease, and having too little cholesterol could actually be risky — so the old idea that cholesterol causes heart problems might not tell the whole story, especially for preventing heart issues in healthy people.

Most of the 'bad' particles in your blood that can lead to heart disease are LDL, not the other kind (VLDL), because there are way more LDL particles floating around—even if you have high triglycerides.

When your body doesn’t respond well to insulin (like in prediabetes), it makes more of the bad, tiny, sticky cholesterol particles that clog arteries.

When you have too much 'bad' cholesterol (LDL) in your blood, it sticks to the walls of your arteries and builds up like gunk, making them narrow and stiff — which raises your chance of having a heart attack or stroke.

Saturated fat raises LDL cholesterol, but mostly the 'bigger, fluffier' kind that doesn't clog arteries as much as the small, sticky kind.