In fact, half of the people who have cardiac events have “ideal” levels of LDL cholesterol.
LDL particles come in various sizes, with small, dense LDL being more harmful than light, fluffy LDL.
So you can reduce your risk of heart disease, by a lot, without lowering your LDL.
Abbreviation of low-density lipoprotein
["LDL: A Logic-Based Data-Language", S. Tsur et al, Proc VLDB 1986, Kyoto Japan, Aug 1986, pp.33-41].