You need to consume about 80 micrograms of vitamin K each day for your blood to clot properly. If you take a blood-thinning medication, such as Coumadin, your doctor may prescribe a diet low in vitamin K. Blood thinners work by decreasing vitamin K's blood-clotting ability, so your dose is based on the amount of vitamin K you consume. Suddenly increasing your vitamin K intake can increase your risk for blood clots, while decreasing it can increase your risk for bleeding when on these medications. Understanding which foods are high in vitamin K can help you follow your doctor's recommendations for vitamin K consumption.
Foods to Limit
If you're taking a blood thinner, the Office of Dietary Supplements recommends limiting foods high in vitamin K, which are those that contain at least 200 percent of the daily value, to one serving per day, as well as limiting foods with moderately high amounts of vitamin K, which are those that contain between 60 and 199 percent of the DV, to no more than three servings per day. Foods high in vitamin K include raw parsley and boiled green leafy vegetables such as kale, spinach, Swiss chard, turnip greens, collard greens and mustard greens. Foods that are moderately high in vitamin K include cooked Brussels sprouts and raw lettuce, endive, broccoli, turnip greens and spinach. Other foods that provide significant amounts of vitamin K include cabbage, asparagus, peas, kiwi fruit, grapes and blueberries.
- University of Maryland Medical Center: Vitamin K
- National Institutes of Health: Important information to know when you are taking: Warfarin (Coumadin) and Vitamin K
- Office of Dietary Supplements: Important information to know when you are taking: Coumadin and Vitamin K
- Drugs.com: Vitamin K In Foods
- U.S. Food and Drug Administration: Calculate the Percent Daily Value for the Appropriate Nutrients