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Research Shows Air Pollution May Cause Vitamin D Deficiency

Morgan Chamberlain
Author: Expert reviewer:
December 15, 2021
Morgan Chamberlain
Former mbg Supplement Editor
By Morgan Chamberlain
Former mbg Supplement Editor
Morgan Chamberlain is mindbodygreen's former supplement editor. She graduated from Syracuse University with a Bachelor of Science degree in magazine journalism and a minor in nutrition.
Ashley Jordan Ferira, Ph.D., RDN
Expert review by
Ashley Jordan Ferira, Ph.D., RDN
mbg Vice President of Scientific Affairs
Ashley Jordan Ferira, Ph.D., RDN is Vice President of Scientific Affairs at mindbodygreen. She received her bachelor's degree in Biological Basis of Behavior from the University of Pennsylvania and Ph.D. in Foods and Nutrition from the University of Georgia.
grey sky with dark black/grey smoke or air pollution in the center
Image by Zoran Milich / Stocksy
December 15, 2021

Substances in the atmosphere that contribute to air pollution are not only bad for our lungs but may also affect vitamin D levels, a new study1 published in the journal Scientific Reports reveals.

Vitamin D is an essential fat-soluble micronutrient responsible for the maintenance of bone and immune health, among many other bodily functions.* Vitamin D deficiency is a growing issue that affects an estimated one billion people globally2—including 29% of American adults—which means air pollution could have profound long-term effects on our health and well-being in more ways than one.*

Converting sunshine to vitamin D.

Before we dive into the study and why it's so important, let's review the science. Though the process of receiving essential nutrients from the sun's rays may seem better suited for plants than humans, we've been using the sun to produce vitamin D for millions of years. If this sounds like a magical human version of photosynthesis to you, you're not entirely wrong!

During exposure to sunlight, a chemical in the skin called 7-dehydrocholesterol absorbs ultraviolet B (UVB) rays. This compound is then quickly converted to previtamin D3 and finally, through a process called thermal isomerization (i.e., a heat-driven reaction), previtamin D3 is further converted into bioavailable vitamin D3. Vitamin D3 is the body's preferred form of the vitamin because it is the most bioactive and stable version of the nutrient.*

The link between air pollution and vitamin D synthesis.

Researchers have been studying the correlation between vitamin D levels and exposure to chemicals and pollutants for some time now. A 2018 review3 published in Environment International investigated how vitamin D synthesis, metabolism, and the entire vitamin D endocrine system (VDES) may be affected by exposure to environmental chemicals, air pollution, and smoking. It found there was significant evidence suggesting that exposure to these compounds can interfere with the VDES and directly contribute to vitamin D deficiency.

While the latest study published in Scientific Reports isn't the first of its kind, it does provide additional information on how specific pollutants may affect vitamin D absorption in a particular geography and population (in this case, Kuwait). In the study, researchers reviewed four years of weather data in Kuwait to investigate the association of various pollutants with UVB intensity on the ground. They found a distinct correlation between increased air pollutants and decreased UVB intensity—particularly ozone, sulfur dioxide, nitric oxide, benzene, and ethyl-benzene. 

Benzene and nitric oxide levels were found to be higher in the morning and evening hours, which is when sun exposure is highest in the region due to high midday temperatures. The decreased UVB levels (i.e., less sunshine hitting the skin) during these times could be a key factor explaining why vitamin D deficiencies are so prevalent in Kuwait, where only 20% of adults4 and 4% of adolescents5 have sufficient levels of vitamin D despite the use of fortified foods (which contain very modest vitamin D content, in Kuwait and the U.S., mind you). 

The bottom line.

While research to more intimately understand the link between air pollutants and vitamin D deficiency is ongoing, the results of this study show that air pollution may have a profound effect on vitamin D levels and sufficiency throughout a population.

If you live in a city in the U.S. with poor air quality—such as Los Angeles, San Diego, or Phoenix—you may want to consider a sustainable vitamin D3 supplement with built-in absorption technology (like mindbodygreen's vitamin D3 potency+) to ensure you're maintaining healthy levels of vitamin D throughout life.* Between the sun, a few select foods, and smart supplementation, you should be meeting your vitamin D needs in no time.*

If you are pregnant, breastfeeding, or taking medications, consult with your doctor before starting a supplement routine. It is always optimal to consult with a health care provider when considering what supplements are right for you.

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