Word from the Mayo Clinic is that people whose diets provide higher levels of vitamin K have an approximately 45 percent lower risk of developing non-Hodgkin's lymphoma, an immune system cancer, than those whose "K" intake is lowest.
The investigators compared food questionnaires from 603 newly diagnosed patients with the disease as well as from 1,007 cancer-free controls. The questionnaire asked about the intake of 120 food items two years prior to the cancer diagnosis or enrollment in the study. The researchers also asked about a variety of supplements in order to estimate overall vitamin K intake.
The team leader described the findings as "fairly strong" but cautioned that they need to be confirmed by further studies. The data showed that increasing intake of "K" via supplements was protective, but that the highest intake from supplements provided no extra advantage, suggesting that taking high doses isn’t likely to be helpful. Good dietary sources of "K" include leaf lettuce and spinach.
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