If a nurse is caring for a patient receiving heparin therapy, and the nurse instructs the patient and the family that certain foods must be taken in limited quantity as they interfere with the effect of the therapy. The foods that must be taken in limited quantity are foods rich in vitamin K. Such foods include green leafy vegetable such as kale, fermented soy (Natto), Brussels sprouts, cabbage, broccoli, prunes, e.t.c