Vitamin K and Blood Thinning

• Because vitamin K counteracts blood thinning drugs, doctors used to advise patients to avoid foods high in the vitamin. Today doctors feel that vitamin K is too important to the diet to be eliminated and stress instead that it be consumed at a consistent level, according to the Mayo Clinic.
  
  

Foods High in Vitamin K

• Limit yourself to one serving a day of vegetables that are high in vitamin K. A boiled half cup of each of the following constitutes a single serving: spinach, kale, turnip greens, collards, Swiss chard and mustard greens. A quarter cup of fresh parsley is considered a serving.
  
  

Foods Moderately High in Vitamin K

• Limit yourself to no more than three servings a day of vegetables that are moderately high in vitamin K. One cup of each of the following constitutes a single serving: raw spinach; raw chopped broccoli or turnip greens; and shredded endive, romaine or green leaf lettuce. A half cup of boiled Brussels sprouts is considered a single serving.
  
  

Foods Lower in Vitamin K

• Foods that contain smaller amounts of Vitamin K can be consumed more freely. They include iceberg lettuce, asparagus, red cabbage and soybean oil. As stated before, consistency is the key to maintaining therapeutic levels of blood thinning drugs.