Vitamin E in canola and other oils hurts lungs

Vitamin E in canola and other oils hurts lungs

A large new Northwestern Medicine study upends our understanding of vitamin E and ties the increasing consumption of supposedly healthy vitamin E-rich oils—canola, soybean and corn – to the rising incidence of lung inflammation and, possibly, asthma.
The new study shows drastically different health effects of vitamin E depending on its form. The form of Vitamin E called gamma-tocopherol in the ubiquitous soybean, corn and canola oils is associated with decreased lung function in humans, the study reports. The other form of Vitamin E, alpha-tocopherol, which is found in olive and sunflower oils, does the opposite. It's associated with better lung function.
"Considering the rate of affected people we found in this study, there could be 4.5 million individuals in the U.S. with reduced lung function as a result of their high gamma-tocopherol consumption," said senior author Joan Cook-Mills, an associate professor of medicine in allergy/immunology at Northwestern University Feinberg School of Medicine.
This is the first study to show gamma-tocopherol is associated with worse lung function.
Cook-Mills presented her research in May at the Oxidants and Antioxidants in Biology World Congress. It was also published in the journal Respiratory Research.
Rates of asthma in the U.S. have been climbing in the last 40 years, coinciding with a switch in U.S. diets from lard and butter to soybean, canola and corn oils, which were thought to be healthier for the heart. Looking at other countries' rates of asthma, Cook-Mills said those with significantly lower rates of asthma have diets high in olive and sunflower oils.
In the U.S., asthma prevalence (the percentage of people who have been diagnosed with asthma and still have asthma) was 8.4 percent in 2010, as reported by the U.S. Department of Health and Human Services Centers for Disease Control and Prevention.
In the U.S., the average blood plasma level of gamma-tocopherol is four or more times higher than those of European and Scandinavian countries that consume sunflower and olive oil, Cook-Mills noted.
"People in countries that consume olive and sunflower oil have the lowest rate of asthma and those that consume soybean, corn and canola oil have the highest rate of asthma," Cook-Mills said. "When people consume alpha-tocopherol, which is rich in olive oil and sunflower oil, their lung function is better."

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