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Home / Health News / Breathing polluted air may increase your weight, says study

Breathing polluted air may increase your weight, says study

The study, published online in the journal Environment International, found that young adults exposed to higher levels of ozone showing less microbial diversity and more of certain species associated with obesity and disease.

By: ANI   | | Published: March 16, 2020 8:44 am
Tags: Air Pollution  Air pollution hazards  causes of air pollution  effects of air pollution  
Air Pollution
Poor air quality can harm your lungs, which in turn can increase the chances of developing complications like pneumonia during COVID-19.

A recent study suggests that breathing dirty air takes a heavy toll on gut bacteria, boosting risk of obesity, diabetes, gastrointestinal disorders and other chronic illnesses. Also Read - Why newborns are more susceptible to pollution and how to protect them?

The study, published online in the journal Environment International, found that young adults exposed to higher levels of ozone showing less microbial diversity and more of certain species associated with obesity and disease. Also Read - Parents, take note! Air pollution may impair your child’s thinking skills later in life



“We know from previous research that air pollutants can have a whole host of adverse health effects. The takeaway from this paper is that some of those effects might be due to changes in the gut,” said senior author Tanya Alderete, an assistant professor of integrative physiology, pointing to studies linking smog with Type 2 diabetes, weight gain and inflammatory bowel diseases. Also Read - Air pollution may up risk of cardiovascular diseases; lowering your BP may reduce the effect

The study comes at a time when air quality in many U.S. cities is worsening after decades of improvement. In December, the Environmental Protection Agency downgraded the Denver metro and North Front Range regions to “serious non-attainment” status for failing to meet national ozone standards.

Regions of eight other states, including some in California, Texas, Illinois, Connecticut, Indiana, New Jersey, New York and Wisconsin, were also penalized for high ozone. Worldwide, according to research published this month, air pollution kills 8.8 million people annually — more than smoking or war.

While much attention has been paid to respiratory health, Alderete’s previous studies have shown pollution can also impair the body’s ability to regulate blood sugar and influence risk for obesity. Other research has shown visits to emergency rooms for gastrointestinal problems spike on high pollution days, and youth with high exposure to traffic exhaust have greater risk of developing Crohn’s disease.

To investigate just what might be going on inside the gut, Alderete’s team used cutting-edge whole-genome sequencing to analyze faecal samples from 101 young adults in Southern California.

The researchers looked at data from air-monitoring stations near the subjects’ addresses to calculate their previous-year exposure to ozone (which forms when emissions from vehicles are exposed to sunlight), particulate matter (hazardous particles suspended in the air), and nitrous oxide, a toxic byproduct of burning fossil fuel.

Of all the pollutants measured, ozone had the greatest impact on the gut by far, accounting for about 11% of the variation seen between study subjects — more of an impact than gender, ethnicity or even diet. Those with higher exposure to ozone also had less variety of bacteria living in their gut.

“This is important since lower (bacteria) diversity has been linked with obesity and Type 2 diabetes,” noted Alderete.

Subjects with higher exposure to ozone also had a greater abundance of a specific species called Bacteroides caecimuris. That’s important, because some studies have associated high levels of Bacteroides with obesity.

In all, the researchers identified 128 bacterial species influenced by increased ozone exposure. Some may impact the release of insulin, the hormone responsible for ushering sugar into the muscles for energy. Other species can produce metabolites, including fatty acids, which help maintain gut barrier integrity and ward off inflammation.

“Ozone is likely changing the environment of your gut to favor some bacteria over others, and that can have health consequences,” said Alderete.

Published : March 16, 2020 8:44 am
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