there really aren't any foods you need to avoid while taking coumadin. since coumadin works on vitamin k foods that are high in vitamin k can affect your inr (the test to measure how well your coumadin is working). foods like kale spinach collard greens and brussels sprouts all have high amounts of vitamin k. while you shouldn't binge on them one day and avoid them the next if you have one or two servings a week consistently you should not notice a difference.
what foods should be avoided when taking coumadin (warfarin)?