Are you taking warfarin regularly but still suffering from clot formation? One of the main reasons for not getting the desired results is your diet. Make sure you’re not eating any of the 7 foods to avoid while taking warfarin.

While taking warfarin, it is essential to be mindful of your diet. Certain foods can interact with the medication, leading to drug-nutrient interaction and reducing warfarin’s effectiveness.

See Also Best Fruits Containing Vitamin K and Best Vegetables Containing Vitamin K.

Knowing which foods to avoid can help ensure you get the most benefit from your medication. In this article, we’ll explore some foods to avoid on warfarin and why they should be avoided so that you can get the best results.

What is Warfarin?

Before we begin, let’s talk a little about warfarin, the drug, and why it is used. Warfarin is a blood-thinning medication known as an anticoagulant commonly prescribed to treat and prevent blood clots.

It works by inhibiting the production of vitamin K, a fat-soluble vitamin that is necessary for blood clotting. By reducing the production of vitamin K, Warfarin helps prevent the formation of blood clots, which can lead to severe health problems such as stroke or pulmonary embolism.

Doctors often give warfarin to patients with cardiovascular diseases to avoid complexities. Warfarin is typically taken orally in pill form and requires careful monitoring to ensure that the dosage is correct.

Foods to Avoid While Taking Warfarin

Now let’s talk about some kinds of food items that are almost a staple in most people’s diet but should be avoided when taking warfarin. And, of course, we talk about the reasons why you should skip these foods, too, so let’s get into it.

1.    Leafy Greens

assorted leafy green vegetables close up, foods to avoid while taking warfarin

Leafy greens like spinach, kale, & collard greens are high in vitamin K, which can interfere with the effectiveness of warfarin.

It is important to limit your intake of these foods while on warfarin. If you do eat them, it is important to maintain a consistent intake to avoid fluctuations in your vitamin K levels.

2.    Swiss Chard

Fresh raw chard leaves, mangold, swiss chard in a pan. dark wooden background. top view.

Swiss chard is a leafy ingredient that is high in vitamin K, which is necessary for blood clotting. However, when taking warfarin, it’s important to limit foods high in vitamin K, including Swiss chard.

Consuming large amounts of Swiss chard can interfere with warfarin’s ability to prevent blood clots, as it can increase vitamin K levels in the body.

3.    Cranberry Juice

Fresh made cranberry juice (with ice)

Cranberry juice is known for its health benefits but can also interact with warfarin.

It includes compounds called antioxidants that can increase the metabolism of warfarin, which means increased potency of the drug, and can thus increase the risk of bleeding.

If you’re craving cranberry juice, consult your nutritionist/physician beforehand so they can better guide you in terms of servings and side effects.

4.    Grapefruit Juice

Fresh grapefruit juice on rustic wooden background (close-up shot)

Grapefruit juice works as an excellent medication, including warfarin. It contains compounds that inhibit the enzyme responsible for metabolizing warfarin in the liver.

As a result, when grapefruit juice is consumed with warfarin, the medication stays in the body for longer periods, increasing the risk of bleeding. This effect can last for up to 24 hours after consuming grapefruit juice.

5.    Alcohol

silhouette of man drinking alcoholic beverage from a bottle (Foods to Avoid While Taking Warfarin)

Alcohol can interact with warfarin and increase the risk of bleeding by affecting your INR (International Normalized Ratio) value, which measures how long it takes to clot blood.

It is important to limit your alcohol consumption while taking warfarin. If you choose to drink, it is important to do so in moderation and monitor your symptoms closely.

6.    Garlic

garlic bulb and cloves (Foods to Avoid While Taking Warfarin)

Garlic is  used for its health benefits but can also interact with warfarin. It increases the effects of warfarin, which can increase the risk of bleeding because garlic has antiplatelet activity.

If you enjoy garlic, it is important to talk to your healthcare provider about whether it is safe to consume while on warfarin.

7.    Green Tea

green tea pouring from tea kettle into teacup

Green tea is praised for its health benefits, but unfortunately, it can also interact with warfarin. It contains compounds that can upsurge warfarin’s effects, leading to an increased risk of bleeding.

One must not also mix any other blood thinning medication like aspirin with green tea because both prevent platelet formation.

Related Articles:

  1. 13 Incredible Turmeric Ginger Tea Benefits

  2. 9 Best Herbal Supplements for Menopause

  3. Siberian Ginseng: Health Benefits, Uses, and Side Effects

  4. Fat Soluble vs. Water Soluble Vitamins


While taking warfarin, it is important to be mindful of your diet and to avoid foods that can interact with the medication. Leafy greens, cranberry juice, alcohol, garlic, and green tea are just a few examples of foods that can interfere with warfarin.

By being aware of these interactions and talking to your healthcare provider about your questions or concerns, you can help ensure that you get the most out of your medication and reduce the risk of complications. So, if you are on warfarin, remember to check with your healthcare provider before making any changes to your diet.

If you enjoyed this post about, “Watch What You Eat: 7 Foods to Avoid While Taking Warfarin”, and would love to see more, join me on YoutubeInstagramFacebook & Twitter!

Get discounted copies of my cookbook here.

Fortunately, because of the ads on our website, readers and subscribers of Healthier Steps are sponsoring many underprivileged families.