eople with higher levels of vitamin K – found in broccoli and spinach among other foods – could have better lung function compared with those with lower levels, a preliminary study suggests.
Researchers found that people with higher levels of vitamin K – which the body needs for blood clotting, helping wounds to heal – were less likely to have asthma, chronic obstructive pulmonary disease (COPD) or have a wheeze.
They were also more likely to perform better on lung health checks.
Vitamin K is found in green leafy vegetables, such as broccoli and spinach, as well as vegetable oils and cereal grains.
The researchers said their study is not enough to recommend that people should use vitamin K supplements for lung health but they called for further research.
The study, published in the journal ERJ Open Research, saw a team of Danish researchers from Copenhagen University Hospital and the University of Copenhagen examine more than 4,000 people living in Copenhagen aged 24 to 77.
People involved in the study took part in lung function testing, called spirometry, gave blood samples and answered questionnaires on their health and lifestyle.
The blood tests showed whether or not people had low levels of vitamin K.
Meanwhile the spirometry test measured the amount of air a person can breathe out in one second and the total volume of air they can breathe in one forced breath.
Our results suggest that vitamin K could play a part in keeping our lungs healthy
Researchers found that people with low levels of vitamin K performed worse on these tests.
Meanwhile people with low levels of vitamin K were twice as likely to report that they had COPD, 81% more likely to report that they have a wheeze and 44% more likely to report having asthma.
Researcher Dr Torkil Jespersen said: “We already know that vitamin K has an important role in the blood and research is beginning to show that it’s also important in heart and bone health, but there’s been very little research looking at vitamin K and the lungs.
“To our knowledge, this is the first study on vitamin K and lung function in a large general population. Our results suggest that vitamin K could play a part in keeping our lungs healthy.
“On their own, our findings do not alter current recommendations for vitamin K intake, but they do suggest that we need more research on whether some people, such as those with lung disease, could benefit from vitamin K supplementation.”
Commenting on the study, Dr Apostolos Bossios, from the Karolinska Institutet in Sweden and secretary of the European Respiratory Society’s assembly on airway diseases, said: “This study suggests that people with low levels of vitamin K in their blood may have poorer lung function.
Research such as this is important, because lung conditions are the third biggest killer in the UK, but only 2% of public funding is spent on research into lung conditions that would help diagnose, treat and manage them much more effectively
“Further research will help us understand more about this link and see whether increasing vitamin K can improve lung function or not.”
Dr Samantha Walker, director of research and innovation at Asthma and Lung UK, said: “This interesting research looks at the link between vitamin K and having a lung condition, such as asthma or chronic obstructive pulmonary disease.
“We’d be interested to see further research in this area so we can better understand if levels of vitamin K are directly associated with lung function, which could help us better understand the impact of diet on people with lung conditions.
“Research such as this is important, because lung conditions are the third biggest killer in the UK, but only 2% of public funding is spent on research into lung conditions that would help diagnose, treat and manage them much more effectively.”
