D I G T E K

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Vitamin K plays a crucial role in blood clotting and bone health. While essential for overall well-being, it’s particularly important to understand its interaction with certain medications, like warfarin. This guide explores which foods are high in vitamin K and provides valuable insights for maintaining a balanced diet.

Consuming consistent amounts of vitamin K is vital, especially if you’re on warfarin. This is because vitamin K can counteract the effects of warfarin, a blood thinner. Significant changes in your vitamin K intake can impact the effectiveness of this medication. This guide will delve into the importance of consistent vitamin K intake and highlight specific foods high in this nutrient.

Understanding Vitamin K and its Importance

Vitamin K is a fat-soluble vitamin that exists in two primary forms: vitamin K1 (phylloquinone) found in plants and vitamin K2 (menaquinone) produced by bacteria in the gut. Both forms are essential for blood coagulation, but vitamin K1 is the primary dietary source.

Consistent vitamin K intake is key to managing blood clotting. If you’re taking warfarin, a blood thinner, fluctuating vitamin K levels can interfere with the medication’s effectiveness. Too much vitamin K can reduce warfarin’s potency, while too little can increase bleeding risk.

Foods Packed with Vitamin K: A Detailed List

Green leafy vegetables are the most well-known sources of vitamin K. However, various other foods contain significant amounts. This comprehensive list categorizes foods by their vitamin K content:

Very High in Vitamin K (More Than 800 mcg per Serving)

Food Portion Size
Kale (cooked) 1 cup
Spinach (cooked) 1 cup
Collard Greens (cooked) 1 cup
Turnip Greens (cooked) 1 cup

High in Vitamin K (400 to 800 mcg per Serving)

Food Portion Size
Beet Greens 1 cup
Dandelion Greens 1 cup
Mustard Greens 1 cup

Medium in Vitamin K (80 to 400 mcg per Serving)

Food Portion Size
Spinach (raw) 1 cup
Brussels Sprouts 1 cup
Broccoli 1 cup
Spring Onions (bulb & top) 1 cup
Iceberg Lettuce 1 head
Green Leaf Lettuce 1 cup
Cabbage 1 cup
Asparagus 1 cup
Endive 1 cup
Parsley 10 sprigs
Okra 1 cup

Other foods that contain vitamin K include beef liver and certain nutritional supplements such as Boost®, Ensure®, Slim Fast®, some multivitamins, and Viactiv® calcium chews. Even tobacco products contain vitamin K.

Maintaining a Balanced Diet with Vitamin K

Understanding which foods are rich in vitamin K empowers you to manage your intake effectively. Whether you’re on warfarin or simply striving for a balanced diet, consistency is key. Consult with your healthcare provider or a registered dietitian for personalized guidance on incorporating vitamin K-rich foods into your diet. They can help you create a meal plan that ensures a safe and effective level of vitamin K consumption. Don’t hesitate to discuss any dietary changes, especially if you experience sudden shifts in your eating habits due to illness.

Tables were adapted from the USDA National Nutrient Database for Standard Reference.

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