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Beti din sticle de plastic? Mai ganditi-va…
Un studiu de ultima ora, efectuat de specialisti din cadrul prestigioasei Harvard School of Public Health, atrage atentia intr-un mod alarmant asupra depozitarii apei sau diverselor bauturi in recipiente de plastic. Cercetatorii sustin ca bautul din sticle de plastic creste riscul ingerarii de substante chimice care modifica sexualitatea viitorilor nou nascuti.
Pentru prima data in istorie, cercetatorii au demonstrat ca atat de popularele recipiente din policarbonati, elibereaza o cantitate variabila a substantei bisfenol A in lichidul depozitat in ele, fie el apa, sucuri carbo-gazoase, ulei sau diverse alimente. Bisfenolul de tip A este o substanta chimica despre care se stie ca interfereaza cu dezvoltarea sistemului reproducator al fetusilor de mamifere si are legatura cu bolile cardiovasculare si diabetul la oameni.
Expertii avertizeaza ca in special copii mici sunt in pericol, deoarece incalzirea sticlelor si biberoanelor de plastic creste cantitatea de bisfenoli eliberata in laptele din care urmeaza sa bea copiii. “Am descoperit cu stupoare ca ingerarea de bauturi reci din sticle de plastic pe parcursul unei singure saptamani, a dus la cresterea cantitatii de bisfenoli din urina cu mai mult de doua treimi. Daca incalzim laptele pe care-l vom administra copiilor in sticle de plastic, cantitatea de toxine va fi cu atat mai mare. Situatia este alarmanta pentru sugari deoarece organismul lor este foarte sensibil la efectul distructiv al bisfenolilor asupra dezvoltarii endocrine”, declara Karin B. Michaels, profesor asociat de epidemiologie in cadrul Harvard School of Public Health.
Canada a interzis deja vanzarea de sticle si biberoane de plastic inca din anul 2008, iar unele firme producatoare de recipienti din mase plastice au eliminat deja bisfenolii din produsele lor. Autoritatea Europeana pentru Siguranta Alimentara se situeaza de celalata parte a baricadei, reprezentantii sai considerand ca organismul uman prelucreaza in mod natural substanele chimice periculoase intr-unele mai putin daunatoare pentru sanatatea sa.
Drinking from plastic bottles 'increases exposure to gender-bending chemical'
Scientists have demonstrated for the first time that polycarbonate containers release the chemical bisphenol A (BPA) into liquid stored in them.
BPA has been shown to interfere with reproductive development in animals and has been linked with cardiovascular disease and diabetes in humans
New research by Harvard School of Public Health found that participants who drank for a week from polycarbonate bottles showed a two-thirds increase of BPA in their urine.
Experts warned that babies are at greater risk, because heating baby bottles increases the amount of BPA released, and the chemical is potentially more harmful to infants.
Study author Karin B. Michels, associate professor of epidemiology at HSPH and Harvard Medical School, said: "We found that drinking cold liquids from polycarbonate bottles for just one week increased urinary BPA levels by more than two-thirds.
"If you heat those bottles, as is the case with baby bottles, we would expect the levels to be considerably higher.
"This would be of concern since infants may be particularly susceptible to BPA's endocrine-disrupting potential."
Altogether 77 students took part in the study after a seven-day "washout" phase in which they drank all cold beverages from stainless steel bottles in order to minimise BPA exposure.
They were then given two polycarbonate bottles and asked to drink all cold beverages from the bottles during the next week.
The results showed the volunteers' urinary BPA concentrations increased 69 per cent after drinking from the polycarbonate bottles.
Previous studies had found that BPA can be transferred from polycarbonate bottles into their contents, but this study is the first to show a corresponding increase in urinary BPA concentrations in humans.
One of the study's strengths, said the research published in Environmental Health Perspectives, is that the students drank from the bottles in a normal way.
Additionally, the students did not wash their bottles in dishwashers or put hot liquids in them, as heating has already been shown to increase the leaching of BPA from polycarbonate.
Canada banned the use of BPA in polycarbonate baby bottles in 2008 and some manufacturers have voluntarily eliminated BPA from their products.
With increasing evidence of the potential harmful effects of BPA in humans, the study's authors believe further research is needed into BPA's impact on babies, and on reproductive disorders and breast cancer in adults.
Most adults carry BPA in their bodies, but expert opinion on the risks is divided.
The European Food Safety Authority believes that people naturally convert the chemical into less harmful substances into the body.
Harvard researcher Jenny Carwile said: "While previous studies have demonstrated that BPA is linked to adverse health effects, this study fills in a missing piece of the puzzle – whether or not polycarbonate plastic bottles are an important contributor to the amount of BPA in the body."
BPA is also found in dentistry composites and sealants and in the lining of aluminium food and beverage cans.
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