Vitamin K

My INR levels continue to fluctuate. The lack of stability is inherent to the use of Warfarin as a blood thinner. The fact of my chemotherapy just complicates matters. Warfarin interacts with other drugs and any changes of medication can affect the effectiveness of the Warfarin.

Diet also plays a part. Vitamin K is present in many foods and is a blood clotting agent i.e. It helps the blood to clot. In my case I need to moderate the amount of Vitamin K I eat to avoid counteracting the Warfarin. I need to be a bit stricter in my intake of certain foods.

Definite foods to avoid -high in Vitamin K

  • Grapefruit / Juice
  • Cranberry / Juice
  • Green Tea

Other foods are broken down by their Vitamin K levels

Limit to 1 serving per day

Food Serving Size Vitamin K Content
Boiled Kale 1/2 cup (660% DV)
Boiled Spinach 1/2 cup (560% DV)
Boiled Turnip Greens 1/2 cup (530% DV)
Boiled Collared Greens 1/2 cup (520% DV)
Boiled Swiss Chard 1/2 cup (360% DV)
Raw Parsley 1/4 cup (300% DV)
Raw Mustard Greens 1/2 cup (260% DV)

Limit to 3 servings per day

Food Serving Size Vitamin K Content
Boiled Brussels Sprouts 1/2 cup (190% DV)
Raw Spinach 1 cup (180% DV)
Raw Turnip Greens 1 cup (170% DV)
Raw Green Leaf Lettuce 1 cup (125% DV)
Raw Broccoli 1 cup (110% DV)
Raw Endive 1 cup (70% DV)
Raw Romaine Lettuce 1 cup (70% DV)

Foods Low in Vitamin K to eat on a Warfarin (Coumadin) Diet

Food Serving Size Vitamin K Content
Turnips (Raw or Cooked) 1 cup 0.2μg (0% DV)
Beetroot (Raw or Cooked) 1 cup 0.3μg (0% DV)
Sweet Corn (Raw or Canned) 1 cup 0.5μg (1% DV
Onions (Raw or Cooked) 1 cup 1μg (1% DV
Winter Squash, Butternut/Spaghetti (Cooked) 1 cup 2μg (2% DV)
Summer Squash (Cooked) 1 cup  3μg (4% DV)
Potatoes (Cooked) 1 cup 3μg (4% DV)
 Aubergine 1 cup 3μg (4% DV)
Mushrooms 1 cup 0 μg (0% DV)
 Tomatoes 1 cup  7 μg (8% DV)
Cucumber 1 cup  17 μg (21% DV)
Iceberg Lettuce 1 cup shredded  17.4 μg (22% DV)
Artichoke 1 medium  17.8 μg (22% DV)

Fruits Low in Vitamin K

Food Serving Size Vitamin K Content
Oranges 1 medium 0 μg (0% DV)
Watermelon 1 cup 0.2μg (0% DV)
Banana 1 medium 0.6μg (1% DV
Pineapple 1 cup 1.2μg (1% DV
Apple 1 medium 4μg (5% DV)
Nectarine 1 medium  3μg (4% DV)
Strawberry 1 cup 3μg (4% DV)
Peach 1 medium 4μg (4% DV)

All grains are low in Vitamin K

Rice, Couscous, Cornflour, Pasta. Wholewheat Flour, White Flour, Quinoa

Of course my diet is a bit more complex as I also have to keep Potassium Levels down

Here is a useful site for looking at the content of a range of foods – whether it is Vitamin K or potassium or any other nutrient.