Gabe's grandfather has a history of heart disease and he takes the prescritption drug coumadin to prevent blood clots. gabe's grandfather should avoid large increases in his intake of:

The answer is Vitamin K

Explanation:

Coumadin is a medication that acts by inhibiting the action of vitamin K, whose main function is to help the blood to form clots with a higher risk of forming emboli and thrombi; Therefore, it is recommended that people who use this type of medication not eat large amounts of foods containing vitamin K such as: beet, lettuce, spinach, parsley, chives, among others.