People with low levels of vitamin K in their blood are more likely to have poor lung function and to say they suffer with asthma, chronic obstructive pulmonary disease (COPD) and wheezing, according to a study. Vitamin K is found in leafy green vegetables, vegetable oils and cereal grains. It plays a role in blood clotting. Researchers say their new findings do not alter current advice on vitamin K intake, but they do support further research to see if some people could benefit from taking vitamin K supplements. The study involved a group of 4,092 people aged between 24 and...