Question

gabes grandfather has a history of heart disease and is on anticoagulant drug therapy. his prescription drugs include coumadin (warfarin). what dietary precaution should his grandfather be taking?
multiple choice
avoid any large increases in fortified grain intake because b vitamins can reduce effectiveness of anticoagulants and promote blood clots.
avoid any large increases in fortified milk intake because vitamin d can reduce effectiveness of anticoagulants and promote blood clots.
avoid any large increases in dark green, leafy, vegetable intake because vitamin k can reduce effectiveness of anticoagulants and promote blood clots.
avoid any large increases in orange juice or citrus intake because vitamin c can reduce effectiveness of anticoagulants and promote blood clots.

Explanation:

Warfarin (Coumadin) is an anticoagulant that works by inhibiting the action of vitamin K. Vitamin K is involved in the synthesis of clotting factors. If there is a large increase in vitamin K intake (which is abundant in dark green, leafy vegetables), it can counteract the effect of warfarin, reducing its anticoagulant effectiveness and potentially promoting blood clots. B vitamins, vitamin D, and vitamin C do not have this specific interaction with warfarin in terms of reducing its anticoagulant effect related to clot - promoting in the way described for vitamin K.

Answer:

Avoid any large increases in dark green, leafy vegetable intake because vitamin K can reduce effectiveness of anticoagulants and promote blood clots.