Vitamin K is found in several forms in our food: Vitamin K1 (phylloquinone), is found in green leafy vegetables. Vitamin K2 (menaquinone) is found predominantly in cheese and meat. This study looked at the role of these different forms of vitamin K in the incidence and mortality risk of cancer and included more than 24,000 participants enrolled in the European Prospective Investigation into Cancer and Nutrition–Heidelberg cohort study. Participants were free of cancer at enrollment and were followed for at least ten years. The amount of dietary vitamin K that participants ate was determined through dietary questionnaires. Results showed:
The study authors comment that “the findings of our study imply that the consumption of cheese may have a beneficial effect with respect to cancer, particularly prostate and lung cancer in men.” They state, however, that research on vitamin K and cancer is just beginning and that more studies are needed before dietary recommendations for cancer prevention can be made.
It is important to note that people taking certain medications, like the blood thinner warfarin (Coumadin), should talk with their doctor about the amount of vitamin K they eat because it can interfere with the effects of their medicine and lead to serious side effects.
Experts suggest that we may cut our risk of cancer nearly in half by choosing to live a healthy lifestyle. That means we need to be wise about food choices, get plenty of exercise, and put bad habits down for good. Read on for more tips:
(Am J Clin Nutr doi: 10.3945/ajcn.2009.28691)
Jane Hart, MD, board-certified in internal medicine, serves in a variety of professional roles including consultant, journalist, and educator. Dr. Hart, a Clinical Instructor at Case Medical School in Cleveland, Ohio, writes extensively about health and wellness and a variety of other topics for nationally recognized organizations, websites, and print publications. Sought out for her expertise in the areas of integrative and preventive medicine, she is frequently quoted by national and local media. Dr. Hart is a professional lecturer for healthcare professionals, consumers, and youth and is a regular corporate speaker.