Many people believe these types of bottles are the safest choice to avoid microplastics.
But new research shows that they can actually contain far more microplastic particles than both plastic bottles and cans – and the explanation lies in the cap.
50 times more microplastics than plastic bottles
A French study found that soda, iced tea, lemonade, and beer in glass bottles had significantly higher concentrations of microplastics compared to the same drinks in plastic bottles or cans.
The least contaminated
Although water in glass bottles contained slightly more microplastics than in plastic bottles, water overall was the drink with the lowest number of particles.
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The paint on caps may be the main culprit
Many glass bottles have metal or plastic-coated caps with paint that releases polyester-based microplastic particles, especially when the caps are scratched or worn.
Microplastics from caps matched the paint
Researchers found that the microplastics’ color, shape, and chemical composition matched the paint used on the caps, strongly suggesting the source.
Cleaning the caps reduced contamination significantly
When researchers blew air onto the caps, microplastic content dropped from 287 to 106 particles per liter.
After rinsing with water and alcohol, the number fell further to 87 particles per liter.
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Wine was less affected
Although wine is usually sold in glass bottles, the use of corks instead of caps likely explains the much lower microplastic levels found in the tests.
Microplastics can also come from other sources
Beyond the caps, microplastics can come from airborne particles, ingredients, water, or plastic parts in manufacturing equipment.
Microplastics have been found throughout the human body
They have been detected in blood, breast milk, the digestive system, lungs, and other organs. Food and drink are considered the main entry routes into the body.
Potential health risks of microplastics
Microplastics have been linked to inflammation, oxidative stress, hormone disruption, fertility problems, and possibly cancer.
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The impact depends on particle size, shape, and chemical composition.
No packaging is completely risk-free
Experts recommend varying your choice of packaging, using glass or steel cups at home, and reducing your intake of processed drinks to limit exposure.
This article is based on information from Health.com.
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