Dietary considerations in coumadin® patients

Dietary Considerations in Coumadin® Patients
Coumadin® (generic name “warfarin”) acts by impairing the function of Vitamin K. Dietary intake of Vitamin K will counteract the medicinal purpose of Coumadin® Intake of large amounts of Vitamin K can diminish the effect of Coumadin®, permitting the blood to clot. Likewise, if you eat too little vitamin K, it may cause your blood to become too thin. It is difficult for most patients to avoid all Vitamin K containing foods. A prudent alternative is to be sure that you eat the same amount of Vitamin K on a regular basis. As an example, the following are foods known to be high in Vitamin K Broccoli
Turnip greens
Chick peas
Brussels sprouts
Green tea
Beef, pork, or chicken livers
Soybean oil
Soy protein products (including tofu) Vitamins A & E (large doses)
If your regular diet already contains these food items, you don’t need to eliminate these foods from your
diet. Consistency in your daily eating pattern is the key! Your medication can be adjusted to the
amount of vitamin K typically in your diet. If you suddenly increase or decrease the amount of vitamin K in
your diet, your medication will not work properly.
II. What is the best diet to follow while I am on Coumadin®?
A. A healthy, low fat diet following the Food Guide Pyramid is the best diet to follow. B. It is important for you to keep the vitamin K content of your diet consistent. The amount of vitamin K
you eat affects the amount of Coumadin® you require.
C. Be sure to tell your doctor if you change your diet. The medication will need to be adjusted to the amount of vitamin K in your diet. III. Does this mean I should avoid foods with a lot of vitamin K?
Absolutely not! Some foods that are high in vitamin K (i.e. leafy, green vegetables, broccoli, and
cauliflower) can contribute to a healthy diet. Your efforts should be focused on keeping your intake of
vitamin K consistent from day to day. The first step is to evaluate your typical intake of vitamin K foods by
reviewing the food list in this packet.
IV. Does cooking, freezing, or drying foods change how much vitamin K is in them?
Although there is little information about the effects of cooking, freezing, or drying on the vitamin K content of foods, it appears that the vitamin K content of cooked, frozen, or dried foods is about the same as fresh foods. V. What to do from here.
Evaluate your typical vitamin K intake by reviewing the food list provided. The list contains foods that are known to be high in vitamin K, as well as a few others that are not very high, but are often asked about by Coumadin® patients. If you do not see a particular food on the list, it most likely contains very little vitamin K, however, be sure investigate a given food if you are concerned. VI. Using the Vitamin K food list:
A. First, review the list to find foods that you are presently eating. Each list contains the same information.
The column on the left organizes foods from the highest vitamin K content to lowest, while the column on
the right is in alphabetical order. Observe the amount of vitamin K contained in the foods you eat. If you
typically eat a larger portion than what is listed, be sure to increase the vitamin K value proportionally. (i.e.
there is 40ug of vitamin K in ½ cup of lettuce, but you eat 2 cups worth in your salad, so you would
actually have 160ug of vitamin K in total). Add up the total amount of vitamin K that you typically consume
in a day. Whatever it may be, 100, 200, 300, 400ug, etc., your job is to keep this daily intake as consistent
as possible. By selecting combinations of foods, and/or adjusting portion sizes you should be able to
consume about the same amount of vitamin K each day.
CAUTION -: the following should be taken only with your physician’s approval, because they also thin
your blood, thus increasing the effect of your medication: alcohol, garlic pills, fish oil capsules, vitamin

Vitamin K tablets can also interfere with your Coumadin® medication. Be sure to get your physician’s
, if you take vitamin K tablets or a multi-vitamin pill with vitamin K included.
Food Item
Portion Size
Food Item
Portion Size
· Ensure 8 oz can 18 ** Current analytical findings indicate that the brew form green tea leaves has negligible vitamin K content.


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