Olive oil is considered 'heart healthy' for a number of reasons, including a reduction in the tendency for blood to clot. Olive oil is a major component of the so-called Mediteranean Diet.

In one study, rats with olive oil in their diet had lower levels of fibrinogen, a compound that promotes clotting. The rats did not have lower levels of blood coagulation factor VII. (abstract (cache))
But studies in humans found that that men who ate a diet rich in olive oil did have lower levels of blood coagulation factor VII (~20% less). (abstract (cache), abstract2 (cache))

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