Note: Most fruits, meats, starches, dairy products and sweets do not contain high amounts of vitamin K. Consuming large amounts of cranberry juice may increase warfarin levels (so your INR may be higher, and you may be at a higher risk for bleeding).
Keeping this in view, what foods can decrease warfarin activity?
The foods that will potentially cause notable interactions with warfarin are mango, grapefruit, cranberry, and those with high vitamin K content such as certain green leafy vegetables, oils, multi-vitamins, herbal supplements, edible seaweed, avocado, and soymilk.
While eating small amounts of foods that are rich in vitamin K should not cause a problem, avoid eating or drinking large amounts of:
- Brussels sprouts.
- Collard greens.
- Mustard greens.
- Green tea.
Warfarin diet: What foods should I avoid?
- Brussels sprouts.
- Mustard greens.
Carrots, cauliflower, green beans, lettuce, red and green peppers, and tomatoes have slightly higher amounts of vitamin K, ranging from 13 to 16 micrograms in a one-cup serving.
Bananas and Warfarin. Here is a thought that may ease your mind: bananas are a fruit that are low in vitamin K and full of potassium which your body needs. In addition to high potassium, they offer a good source of fiber, which can help in normal digestion.
There are a variety of vegetables that contain lower amounts of vitamin K. These include:
- Sweet potatoes.
- Squash (both summer and winter).
Before vitamin K is administered, the potential for warfarin resistance must be balanced against the risk of bleeding — determined according to the patient's indication for anticoagulation. The treatment options for patients who have been over-anticoagulated are: Dose omission. Oral phytomenadione (vitamin K1)
Too much vitamin K in your diet may lessen the effectiveness of Coumadin. Green, leafy vegetables such as broccoli, lettuce, and spinach are high in vitamin K. There are reports that some foods and drinks can help thin the blood.
5 Things to Avoid When Taking Blood Thinners
- Foods Rich in Vitamin K. Specifically for individuals taking the blood thinner warfarin (Coumadin), vitamin K-rich foods like spinach, brussels sprouts, kale and even green tea can counteract the drug's effectiveness.
- Contact Sports.
- Non-Steroidal Anti-Inflammatory Drugs (NSAIDS)
- Grapefruit Juice.
The higher your INR is, the longer it takes your blood to clot. In other words, as the INR increases above a given level, the risk of bleeding and bleeding-related events increases. The most common INR target range for someone on warfarin is somewhere between 2.0 and 4.0.
When the INR is higher than the recommended range, it means that your blood clots more slowly than desired, and a lower INR means your blood clots more quickly than desired.
10 Fruits High in Vitamin K
- Prunes — 24% DV per serving. 5 pieces: 28 mcg (24% DV)
- Kiwi — 23% DV per serving.
- Avocado — 18% DV per serving.
- Blackberries — 12% DV per serving.
- Blueberries — 12% DV per serving.
- Pomegranate — 12% DV per serving.
- Figs (dried) — 6% DV per serving.
- Tomatoes (sun-dried) — 4% DV per serving.
Vitamin K is found in the following foods:
- Green leafy vegetables, such as kale, spinach, turnip greens, collards, Swiss chard, mustard greens, parsley, romaine, and green leaf lettuce.
- Vegetables such as Brussels sprouts, broccoli, cauliflower, and cabbage.
- Fish, liver, meat, eggs, and cereals (contain smaller amounts)
Decreased warfarin effect (Lower INR)
|Amobarbital Butabarbital Carbamazepine Cholestyramine Dicloxacillin Griseofulvin Mercaptopurine Mesalamine Nafcillin Phenobarbital Phenytoin Primidone Ribavirin Rifabutin Rifampin Secobarbital Sucralfate Vitamin K||Coenzyme Q10 Ginseng St. John's wort Green tea|
The higher your INR, the longer it takes the blood to clot or the “thinner” the blood, putting you at risk for bleeding problems. With an increase in vitamin K , your INR level may drop. Conversely, a decrease in vitamin K intake may increase the INR.
Supplements that can interact with warfarin include:
- Coenzyme Q10 (Ubiquinone)
- Dong quai.
- Ginkgo biloba.
- Green tea.
- St. John's wort.
- Vitamin E.
Therapeutic ranges for this test are between 2.0 to 3.0 when a patient is taking Coumadin. INR levels below 2 may allow easier blood clotting to occur while levels above 3 may cause excessive tendency for the patient to bleed.
Cabbage and K. One cup of shredded raw green cabbage contains 53.2 micrograms of vitamin K. That's 59 percent of the 90 micrograms you need each day. The same amount of red cabbage has less vitamin K, with 26.7 micrograms per cup, which is 30 percent of what you need on a daily basis.
It is possible that the cranberry juice added to the other hypoprothrombinemic effects in these patients produced an elevated international normalized ratio (INR) and hemorrhage. Thus, this study indicates that a single dose of cranberry juice given to healthy persons does not appear to affect warfarin metabolism.
The higher your PT or INR, the longer your blood takes to clot. An elevated PT or INR means your blood is taking longer to clot than your healthcare provider believes is healthy for you. When your PT or INR is too high, you have an increased risk of bleeding.
For some who have a high risk of a blood clot, the INR needs to be higher - about 2.5 to 3.5. A prolonged PT means that the blood is taking too long to form a clot. This may be caused by conditions such as liver disease, vitamin K deficiency, or a coagulation factor deficiency.