Patients taking warfarin need to be educated about the vitamin K content of foods to avoid therapeutic failure. Foods high in vitamin K that should be limited to no more than one serving per day include:

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Spinach is high in vitamin K, which can interfere with the effectiveness of warfarin, a blood thinner. Patients are advised to limit their intake of foods high in vitamin K to maintain consistent blood levels.

Patients Taking Warfarin Need to Be Educated About the Vitamin