Maybe they told me not to eat Vitamin K for another reason, but I distinctly remember that it was one of the things -- in the form of leafy greens -- that I could not eat while I was taking Coumadin. I remember because I was vegetarian at the time and I thought, Jeez, what am I going to eat? I had an embolism in my lungs and so had to take warfarin for six months or so afterwards. But I definitely remember -- no Vitamin K, no aspirin, no more birth-control pills. (Maybe they wanted nothing that would cause clots that might reactivate the embolism, but nothing that would thin the blood so no aspirin...?) It was almost 22 years ago so I don't remember too well.
Sorry for my misinformation, whoever wrote the original post. Thanks for clearing that up, Amato!