Drinking from plastic bottles increases the exposure to harmful chemicals.
Scientists have long been concerned about the possible effects of bisphenol A (BPA) on people’s health and this chemical is every day used in numerous plastic packaging of different food products and beverages.
Also, the BPA chemical is used in production of tin cans, and in some countries BPA is officially declared as toxic.
The survey revealed that participants who drank from polycarbonate bottles for a weak had up to 69 % higher concentration of the BPA chemical in the urine samples, compared to those who didn’t used plastic bottles. Scientists didn’t discover how much did the respondents drink during the day.
The survey was conducted at Harvard University and 77 students were examined.
The students had previously undergone a phase of flushing (cleaning) in which all cold beverages they had were packed in bottles made of stainless steel in order to reduce the exposure to BPA.
After this phase, each of the students got two polycarbonate bottles which they were supposed to use over the next week.
This research has shown that drinking cold beverages from polycarbonate bottles within a week increases the presence of the chemical BPA in the urine for more than two thirds. If these bottles are heated, as is the case with children’s bottles, then the level of BPA in urine is significantly higher.
This fact is concerning experts, because BPA impact on glands function in babies is much stronger, says an epidemiology professor at “Harvard Medical School”, Prof.Dr. Karin B. Michels.
Previous studies have shown that high values of consumed BPA chemical is closely related to congenital defects, growth and development problems and increased risk of heart disease and diabetes.
Last year Canada banned the use of BPA chemical in polycarbonates used in production of baby bottles, and some producers voluntarily stopped the use of this harmful chemical.