Warfarin is a blood thinner that can both treat and prevent blood clots from forming, according to MayoClinic.com. A number of foods interact with warfarin in ways that can be dangerous. Foods rich in vitamin K can make warfarin less effective, increasing the risk of blood clots; some beverages can make it too effective, posing a risk of serious bleeding.
Leafy Greens
Leafy greens are a rich source of vitamin K, so it's a good idea not to eat large amounts of them while take warfarin, according to MayoClinic.com. Small amounts are fine; it's best to try to get a consistent amount of vitamin K every day. Consider limiting portion sizes when eating kale, spinach, Brussels sprouts, parsley, collard greens, mustard greens, chard, cabbage, endive and turnip greens.
Beverages
Avoid cranberry juice and alcohol when you're taking warfarin as they can increase the risk of bleeding, according to MayoClinic.com. If you can, eliminate them altogether, but if not, drink only small amounts. It's best to avoid whole cranberries as well. Avoid green tea should because it contains vitamin K.
Other Foods
Certain vegetable oils, such as soybean and canola oils, contain large amounts of vitamin K and are best limited, according to MedlinePlus. Other vegetable sources of vitamin K that should be noted are asparagus, broccoli, green onions and soybeans. Some doctors also warn against eating licorice when taking warfarin.
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