Skip to content

Asthma Health Center

Low Vitamin D Levels Linked to Asthma

Study Shows Asthmatic Kids With Vitamin D Insufficiency Have Poorer Lung Function
Font Size
A
A
A
By
WebMD Health News
Reviewed by Louise Chang, MD

March 3, 2010 (New Orleans) -- Many children with asthma have low blood levels of vitamin D, and the insufficiency seems to place them at risk for more severe disease.

In a study of 99 kids with asthma, 47% had vitamin D insufficiency. Compared with children with normal levels of vitamin D levels, those with vitamin D insufficiency:

  • Had poorer lung function
  • Had higher levels of immunoglobulin E (IgE), an immune system protein the body makes in response to allergens that tells you the likelihood that you're allergic
  • Were more likely to need inhaled and oral steroid medications to reduce airway inflammation and mucus production
  • Were more likely to need long-acting beta-agonist drugs that relax muscles in the lung's airways, improving a patient's ability to breathe freely and reducing asthma symptoms.

Further studies in the lab showed that vitamin D has an anti-inflammatory effect on cells and enhances the activity of inhaled steroids.

About 21 million Americans suffer from asthma, which is caused by inflammation and swelling of the airways. The inflammation, in turn, can cause excessive mucus production and narrowing of the airways, resulting in asthma symptoms such as shortness of breath, coughing, and wheezing.

The findings were presented at the American Academy of Allergy, Asthma & Immunology annual meeting.

The study doesn't prove cause and effect. And it's not clear whether low vitamin D causes more severe asthma that requires treatment or whether more severe asthma lowers vitamin D levels, says study researcher Daniel A. Searing, MD, of National Jewish Health in Denver.

Also still unknown is whether vitamin D supplements would improve asthma control and lower the need for medication, he tells WebMD.

Still, a number of studies now suggest that low vitamin D levels are associated with allergies and asthma, says James Gern, MD, vice chair of the committee that chose which studies to highlight at the meeting and professor of pediatrics at the University of Wisconsin in Madison.

If a person has vitamin D insufficiency, "we need to correct it anyway. So it will be interesting to see if the supplements help improve asthma symptoms," he tells WebMD. Gern was not involved with the work.

In the study, vitamin D insufficiency was defined as levels below 30 nanograms per milliliter of blood.

When Is Your Asthma Worse?

When Is Your Asthma Worse?

Take the WebMD Asthma assessment to get Personalized Action Plan

Start Now

Today on WebMD

Lung and bronchial tube graphic
5 common triggers.
group jogging in park
Should you avoid fitness activities?
 
asthma inhaler
Learn about your options.
man feeling faint
What’s the difference?
 
Los Angeles skyline in smog
Slideshow
man in a field with allergies
Slideshow
 
Woman holding inhaler
VIDEO
Slideshow Allergy Myths and Facts
Slideshow
 

Pollen counts, treatment tips, and more.

It's nothing to sneeze at.

Loading ...

Sending your email...

This feature is temporarily unavailable. Please try again later.

Thanks!

Now check your email account on your mobile phone to download your new app.

Man outdoors coughing
Article
Lung and bronchial tube graphic
Article
 
10 Worst Asthma Cities
Slideshow
runner
Article