Warfarin diet: What foods should I avoid? - MayoClinic.com

Warfarin is a blood-thinning medication that helps treat and prevent blood clots. There is no specific warfarin (Coumadin) diet. However, certain foods and beverages can make it so warfarin doesn't effectively 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 average daily allowance 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 eating or drinking large amounts of:

• Kale
• Spinach
• Brussels sprouts
• Parsley
• Collard greens
• Mustard greens
• Chard
• Green tea

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