Every Sunday, my grandfather filled half his plate with vegetables.
Spinach.
Broccoli.
Kale.
One day, a neighbor warned him,
“Be careful! Those vegetables cause blood clots!”
My grandfather didn’t throw them away.
Instead, he asked his doctor.
The doctor smiled and explained,
“Vegetables don’t ‘form’ blood clots. However, some leafy green vegetables are high in vitamin K, which can affect the way the blood-thinning medication warfarin works. For most people, these vegetables are incredibly healthy and should be part of a balanced diet.”
That conversation cleared up a myth our family had heard for years.
The Truth About Vitamin K
Vitamin K is an essential nutrient that helps your body with normal blood clotting and bone health.
For most people, eating vitamin K-rich vegetables is healthy and encouraged.
The important exception is for people taking warfarin (Coumadin®), who should keep their vitamin K intake consistent rather than suddenly increasing or eliminating these foods.
5 Vegetables Often Misunderstood
1. Spinach
Rich in vitamin K, folate, iron, and antioxidants.
2. Kale
Packed with vitamins A, C, and K, along with fiber.
3. Broccoli
Provides fiber, vitamin C, and beneficial plant compounds.
4. Brussels Sprouts
A nutritious source of vitamin K, vitamin C, and fiber.
5. Swiss Chard
Loaded with minerals, vitamins, and colorful antioxidants.
Who Should Be Careful?
If you take warfarin, don’t suddenly stop eating these vegetables—or suddenly eat much more of them.
Instead:
- Eat a similar amount each week.
- Tell your healthcare provider if your diet changes significantly.
- Follow your prescribed medication plan.
- Attend regular INR blood tests as recommended.
For people taking newer blood thinners such as apixaban (Eliquis), rivaroxaban (Xarelto), dabigatran (Pradaxa), or edoxaban (Savaysa), vitamin K generally does not have the same interaction, but it’s still wise to discuss your diet with your healthcare provider.
Grandpa’s Heart-Healthy Vegetable Bowl
Ingredients
- Fresh spinach
- Broccoli florets
- Cherry tomatoes
- Olive oil
- Lemon juice
- Walnuts
- Grilled salmon or beans
How to Prepare
Steam the broccoli until tender-crisp.
Combine with the spinach and tomatoes.
Top with walnuts and your choice of protein.
Dress with olive oil and lemon juice.
Healthy Habits That Help Reduce Blood Clot Risk
- Stay physically active.
- Avoid smoking.
- Maintain a healthy weight.
- Stay hydrated.
- Follow your prescribed medications.
- Eat a balanced diet rich in fruits, vegetables, whole grains, and healthy fats.
One Final Thought
Leafy green vegetables do not cause blood clots in healthy people.
In fact, they’re among the most nutritious foods you can eat. If you’re taking warfarin, the key is consistency, not avoidance. For everyone else, colorful vegetables remain an important part of a heart-healthy diet that supports overall wellness for years to come.
For more tips on healthy aging, check out these 6 things you can still do in your 70s and 80s that mean you’re doing better than most, or try this 5-minute semolina and yogurt recipe that’s perfect for any day, and discover what happens when you eat this fruit tonight.
