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Warfarin is a blood-thinning medication that helps treat and prevent blood clots. It’s important to pay attention to what you eat while taking warfarin. One nutrient that can lessen warfarin’s effectiveness is vitamin K. It’s important to be consistent in how much vitamin K you get daily.
The adequate intake level of vitamin K for adult men is 120 micrograms (mcg). For adult women, it’s 90 mcg. While eating small amounts of foods that are rich in vitamin K shouldn’t cause a problem, avoid consuming large amounts of certain foods or drinks, including:
Kale
Spinach
Brussels sprouts
Collards
Mustard greens
Chard
Broccoli
Asparagus
Green tea
Certain drinks can increase the effect of warfarin, leading to bleeding problems.
Avoid or consume only small amounts of these drinks when taking warfarin:
Cranberry juice
Alcohol
Talk to your doctor before making any major changes in your diet and before starting any over-the-counter medications, vitamins or herbal supplements. If you are unable to eat for several days or have ongoing stomach upset, diarrhea or fever, consult your doctor. There is a problem with information submitted for this request.
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Ed To Know About My Diet?
It is most important to eat a healthy, consistent, and balanced diet. Certain foods and dietary supplements have vitamin K. Vitamin K works against warfarin. If you eat more vitamin K, it can lower your INR.
If you eat less vitamin K, it can raise your INR. It is okay to eat foods high in vitamin K.
Check with your provider before making any big changes in your diet. Contact your provider if there are sudden or big changes in your diet due to illness.
Foods with vitamin K that could affect warfarin are listed on the next 2 pages. Vitamin K can also be found in some nutrition supplements, such as:
Boost ® , Ensure ® , and Slim Fast ®
, , and Certain multiple vitamins and Viactiv ® calcium chews
calcium chews Tobacco, such as cigarettes and chewing tobacco
Talk with your provider if you have questions about vitamin K.
Vitamin K foods
Try and keep the same amount of vitamin K in your diet each day. Check with your provider before making any big changes to your diet.
Very high in vitamin K (more than 800 mcg per serving)
Food Portion Size Kale (frozen, cooked, boiled) 1 cup Spinach (frozen, cooked, boiled) 1 cup Collards (frozen, cooked, boiled) 1 cup Turnip greens (frozen, cooked, boiled) 1 cup
High in vitamin K (400 to 800 mcg per serving)
Food Portion Size Beet greens 1 cup Dandelion greens 1 cup Mustard greens 1 cup
Medium in vitamin K (80 to 400 mcg per serving)
Food Portion Size Spinach (raw, leaf) 1 cup Brussel sprouts 1 cup Broccoli 1 cup Onions (springs or scallions, tops and bulb) 1 cup Lettuce (iceberg) 1 head Lettuce (green leaf) 1 cup Cabbage 1 cup Asparagus 1 cup Endive 1cup Parsley 10 sprigs Okra 1 cup
Tables were adapted from the USDA National Nutrient database for Standard Referenc.
What Do I Need To Know About My Diet?
Try and keep eating what you normally do. It is okay to eat foods high in vitamin K.
Check with your provider before making any big changes in your diet.
Contact your provider if there are sudden or big changes in your diet due to illness.
What Is High In Vitamin K?
The most common foods with high vitamin K are green leafy vegetables such as kale, collard greens, broccoli, spinach, cabbage, and lettuce. All foods are okay, but do not make big changes to how much or what you eat. Check with your provider before making any big changes to your diet.
Very high in vitamin K (more than 800 mcg per serving)
Food Portion Size Kale (frozen, cooked, boiled) 1 cup Spinach (frozen, cooked, boiled) 1 cup Collards (frozen, cooked, boiled) 1 cup Turnip greens (frozen, cooked, boiled) 1 cup
High in vitamin K (400 to 800 mcg per serving)
Food Portion Size Beet greens 1 cup Dandelion greens 1 cup Mustard greens 1 cup
Medium in vitamin K (80 to 400 mcg per serving)
Food Portion Size Spinach (raw, leaf) 1 cup Brussel sprouts 1 cup Broccoli 1 cup Onions (springs or scallions, tops and bulb) 1 cup Lettuce (iceberg) 1 head Lettuce (green leaf) 1 cup Cabbage 1 cup Asparagus 1 cup Endive 1cup Parsley 10 sprigs Okra 1 cup
Tables were adapted from the USDA National Nutrient database for Standard Reference.
What Is Warfarin?
In addition, it treats blood clots if they do form by preventing them from getting larger.