Get the Coumadin Diet Plan and Cookbook!

Coumadin BookThis indispensable book includes:

  • 6 weeks of complete meal plans, with shopping lists
  • 95+ delicious Coumadin safe recipes
  • Information about managing your diet on Coumadin
  • Ingredient and cooking tips throughout the book
  • Complete Nutrition Facts including Vitamin K content for each recipe

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How Much Vitamin K is in...?

Find out the exact amount of Vitamin K (in micrograms) of almost a thousand common foods! Listed both alphabetically and then in order of the amount of Vitamin K in the food, this downloadable list will help you know exactly how much Vitamin K you're eating. Just $4.95 for the eBook or $12.95 for the paperback book! Shop now!

It's easy to get answers about health and nutrition! Just send your question by email to askdrgourmet@drgourmet.com and Dr. Harlan will respond to selected questions of general interest. Answers will be posted in the Ask Dr. Gourmet newsletter (sign up now!) and archived in the Ask Dr. Gourmet section of the website.

Please note that the Ask Dr. Gourmet feature is restricted to questions regarding food and nutrition. Due to the many questions we receive, not all questions may be answered. For more specific questions about your individual health, please contact your doctor. About Timothy S. Harlan, M.D. | Terms of Use | Privacy Policy


          

Ask Dr. Gourmet



Love your website. It is so informative. On the paperwork from the pharmacy cranberries and cranberry juice are mentioned as foods to be avoided while on Coumadin. Is there a list of foods that may interact with Coumadin even though they are low in Vitamin K (i.e. peanuts and cranberries). Also, someone told me not to eat onions while on Coumadin because they act as a blood thinner. Finally, is soy protein isolate on the "no" list?

Dr. Gourmet Says...

Thanks for your nice words about the Dr. Gourmet website.

There is no list of ingredients that are low in Vitamin K that might have an effect on INR in those taking Coumadin® (warfarin). This is because most such information comes from isolated case reports.

The concern that some have with peanuts (which are actually very low in Vitamin K) is a compound called resveratrol. This is found in many plants including peanuts, grapes and berries like cranberries and blueberries. Resveratrol is an antioxidant and interest in it has been high because of the research showing that wine and grape juice might have a protective effect against atherosclerosis and heart disease.

There is research that shows this compound can have an effect on platelets (the blood cell that helps speed clotting). Partially inactivating platelets, resveratrol might be the mechanism that contributes to their beneficial effect. At the same time this might be a problem for users of Coumadin. There is, however, no evidence that I have found that peanuts effect INR levels.

There have been some case reports that cranberry juice can have an effect on INR levels. One report in the British Medical Journal in 2003 is concerning. The patient in question was drinking a great deal of cranberry juice and on an essentially liquid diet. There is a cautionary statement by the British Government about drinking cranberry juice while on Coumadin as a result of some other case reports. There have not been any such case reports that I have found in North America. (Updated information on cranberry juice - it's safe!)

Onions are low in Vitamin K and should be safe. Green onions (scallions, spring onions) are very high in Vitamin K and should be avoided, however.

Because mature soybeans are very high in Vitamin K many are concerned about soy protein powders and other isolates. There is a great deal of research going on about the benefits of supplementing with such preparations and none is conclusive. As one is not going to be able to determine the Vitamin K content of such soy products it is best to avoid them.

Thanks for writing,

Timothy S. Harlan, M.D.
Dr. Gourmet

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How Much Vitamin K is in....?

There's an easy way to find out about the nutrition content of any food. Just use The Dr. Gourmet Diet Plan Software.

Just register to use the software, then click the Recipe Box tab. The ingredient database includes over 7,000 ingredients and will show you the nutritional information for those ingredients - including Vitamin K. Use the Food Diary section to help you track your daily Vitamin K intake along with calories and other nutrients. Try it now!