This isn't necessarily true. High content of certain cholesterols in the blood does cause heart attacks. It doesn't just indicate it - it actually causes it.

And, we have shown the mechanism of action. Certain cholesterols will build up on artery walls, constraining the flow of blood. When there is too much build up and/or the vessel is too narrow, blood can be constrained too much, causing loss of blood flow and therefore oxygenation. The heart has MANY capillaries and requires a lot of oxygen.

This is really for real.