While certain foods and medications increase the effectiveness of your blood thinner, vitamin K actually decreases its effectiveness. However, you only need to be concerned with vitamin K in your diet if you are taking either Coumadin or Warfarin. Vitamin K helps promote blood clotting, counteracting the medication. You do not need to avoid foods with vitamin K, but it is recommended that you eat the same amount every day. Consuming too much or too little vitamin K on any given day can cause your blood to become too thick or too thin.
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