If you take Coumadin or generic warfarin, you must be consistent in the amount of vitamin K you eat from day to day. This helps make sure that the Coumadin medication dose is working right in your body and not putting you at risk for blood clots or bleeding. Warfarin is a blood-thinning medicine that helps treat and prevent blood clots. There's no special diet for people who take warfarin. But some foods and drinks can make it harder for warfarin to prevent blood clots. It's important to pay attention to what you eat and drink while taking this medicine. Successfully managing your diet while taking warfarin focuses on consistency rather than complete food elimination. Understanding which foods contain high levels of vitamin K and maintaining steady intake patterns helps keep your INR levels stable and your treatment effective. Warfarin and Your Diet If you are taking warfarin (previously known as Coumadin®), some foods can affect how well this medication works for you. The most important thing to remember is to eat what you normally eat and be consistent (don’t make any major changes) in your diet. To help warfarin work well, it is important to keep your vitamin K intake as consistent as possible. If you greatly increase or decrease foods rich in vitamin K in your diet, let your provider know right away. A large increase in vitamin K can lower your INR to cause dangerous clotting in your blood. Because your body uses vitamin K to help your blood clot, you need to watch how much and how often you eat foods high in vitamin K. Changing the amount of vitamin K you eat will change how well the medicine works. A warfarin diet doesn't have to be difficult. In this article we break down the diet in easy-to-understand terms. Check it out! When taking warfarin, people may need to limit foods high in vitamin K and avoid certain foods or drinks, such as grapefruit juice and certain herbal preparations. People taking warfarin should. The most important thing to remember is to eat what you normally eat and be consistent in your diet. Coumadin®(warfarin) helps keep your blood from clotting, which increases your risk of bleeding. People on warfarin need consistent amounts of vitamin K. These foods are more likely to affect your medication results when eaten inconsistently or in larger portion sizes.