Mechanism
Warfarin works by inhibiting vitamin K epoxide reductase → reduces active vitamin K → reduces clotting factors. Eating vitamin K-rich foods reduces warfarin's effectiveness.
Recommendation
The key is CONSISTENCY, not avoidance. If you eat kale regularly, keep it consistent week-to-week so warfarin dose can be adjusted. Sudden increase in vitamin K → reduced INR → clot risk. Sudden decrease → elevated INR → bleeding risk.
⚠️ Foods to Watch/Manage
kalespinachbroccolibrussels-sproutscollard-greensparsleygreen-tea (large amounts)natto (extremely high K2)