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  • Intake of vitamin D...

Intake of vitamin D supplements fails to reduce asthma attacks

Written By : Dr. Kamal Kant Kohli Published On 2023-02-08T11:30:09+05:30  |  Updated On 8 Feb 2023 12:16 PM IST
Pregnancy vitamin D supplementation and offspring bone mineral density
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UK: Vitamin D supplements do not lower the risk of asthma attacks in adults or children, an updated Cochrane review has shown. However, the review found no harm in taking vitamin D and did not examine other possible health benefits.

These findings contrast a previous Cochrane review that indicated a reduction in asthma attacks in people taking vitamin D.

Researchers from the Queen Mary University of London and the University of Edinburgh carried out the review. Researcher Adrian Martineau, Clinical Professor of Respiratory Infection and Immunity at the Queen Mary University of London, said: “Vitamin D deficiency has been linked to an increased risk of severe asthma attacks and our previous Cochrane review, published in 2016, found that vitamin D reduced the risk of asthma attacks. However, more studies have been published since then, and when we included the extra data in our updated review, the overall results changed. We found that vitamin D supplements did not affect the risk of asthma attacks or control of asthma symptoms compared with a placebo.”

Professor Martineau and his colleagues analysed the results of 20 randomised controlled trials – the gold standard for medical research – including data on 1,155 children and 1,070 adults with asthma. This compares to nine trials involving 1,093 people whose data contributed to the previous review. The majority of patients in the trials had mild to moderate asthma.

When they compared patients assigned to take a vitamin D supplement with those assigned to take a placebo (dummy medication), the researchers found no statistically significant difference in the number of people who experienced an asthma attack requiring treatment with a course of steroid tablets.

The review did not find any effect of taking vitamin D on asthma control even when people were vitamin D-deficient when they joined the studies, or with different doses of the supplement, or in people of different ages.

Professor Martineau said: “In contrast to our previous Cochrane review on this topic, this updated review does not find that vitamin D offers protection against asthma attacks or improves control of asthma symptoms. However, the trials we looked at did not include many people with severe asthma or people with very low levels of vitamin D in their blood, so these are areas where more research is still needed.

Anne Williamson, the first author on the study who is also from Queen Mary University of London, commented: “We can’t be certain why this updated review has given a different result to our original study from 2016. It could be that people with asthma may be getting better treatment than previously. Or it could be that, in general, rates of vitamin D deficiency have decreased over time, due to increased intake of supplements or fortified foods. Either of these factors could obscure the potential benefits from taking vitamin D supplements. Regardless of the reason, these most recent findings are likely to be correct for people living with asthma today. This also highlights why updating reviews is vital when more research is published.”

Today’s review includes data from 20 clinical trials, compared with nine in the 2016 review, and children with asthma are better represented than previously. The review team say they have also applied stricter criteria on which studies would be included, compared to some other reviews. For example, they excluded studies that did not compare vitamin D with a placebo and those that did not monitor patients for at least 12 weeks.

Most of the trials included in the review involved patients taking cholecalciferol, a typical vitamin D supplement. One trial that used calcidiol, which is a compound that the body can make from vitamin D, reported an improvement in asthma control in patients taking this supplement. The reviewers say further research is needed to confirm whether this form of vitamin D benefits people with asthma.

Reference:

Anne Williamson, Adrian R Martineau, Aziz Sheikh, David Jolliffe, Chris J Griffiths published: 06 February 2023 https://doi.org/10.1002/14651858.

Cochrane Database of Systematic Reviewsvitamin Dasthma attacksasthmacholecalciferol
Source : Cochrane Database of Systematic Reviews
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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