While drinking green tea may be beneficial, there is less evidence to support taking green tea extract. Here's what you need to know. While delicious and nutritious, leafy green vegetables' vitamin K content means your intake of these vegetables must be controlled. These vegetables include arugula, collards, kale, mustard greens, parsley, spinach, Swiss chard, turnip greens and wheat grass. Atrial fibrillation (AFib) occurs when the normal rhythmic pumping of the upper chambers of the heart, called the atria, breaks down. Instead of a normal heartbeat, the atria pulse, or fibrillate. People often combine foods. For example, chocolate and peanut butter might be considered a tasty combination. But eating chocolate and taking certain drugs might carry risks. In fact, eating. 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 adequate intake level of vitamin K for adult men is 120 micrograms (mcg). Coumadin, also known as Warfarin, is an anti-coagulant prescribed to treat and prevent blood clots as well as stroke and heart attacks. Certain foods reduce the effectiveness of this blood-thinning medication, so pay attention to what you’re eating. Taking Coumadin does not mean you must limit alcohol entirely -- only that you must drink it in moderation. While you should always speak to your physician to establish an appropriate range, drinking between 1 and 2 alcohol servings should be permissible while taking Coumadin. Warfarin (Coumadin ®) and Your Diet How does what I eat affect warfarin? Foods that are high in vitamin K can affect the way warfarin works in your body. Wheat Belly (2011) is a an anti-wheat book that also recommends a low-carb diet and avoiding bad fats and cured meats. Gluten-Free. Eat unprocessed, real foods including vegetables, meats, raw nuts and seeds. Blood thinner used for people suffering from thrombosis is called Coumadin, a person taking blood thinners should avoid the consumption of alcoholic beverages.