New Study Looks at Effects of Chronic and Continuous BPA Exposure
A new study has found that our exposure to bisphenol-A (BPA) may be greater than previously thought. Theresa Boyle reported on the study in Toronto Star’s Healthzone and quoted the study’s lead researcher, Cheryl Rosenfeld, as saying “We might be taking in more and there is a greater concentration.”
This research, published in Environmental Health Perspectives, is expected to be a “better predictor of BPA concentrations in chronically exposed animals and humans.” Unlike previous studies, which simply tested the effects of a single dose of BPA, this study looked at the impact of dietary exposure to the chemical over time.
The mice in the study were tested after the first 23 hours of exposure and again after 7 days of exposure. Healthzone reports that “mice absorb 2.8 times more of the active form of BPA when continuously exposed to it through their diet compared to when given a single dose.”
Ultimately, if you are sipping from that water bottle containing BPA all day long or if your baby is drinking from a BPA baby bottle all the time, the exposure is going to be significantly higher than if you eat peas from a BPA lined can once per month. Our exposure to BPA is probably higher than we realize. As Healthzone reports, it is found in “hundreds of household items, including tin-can linings, plastic food covers, water bottles, CD liners and even sales receipts.”
Canada is the first country to have declared BPA a toxic substance. The Government of Canada’s current position is that dietary exposure to BPA via food packaging does not pose a risk to most Canadians. However, it also stated that there is sufficient uncertainty stemming from some animal studies to warrant limiting the exposure of infants (especially those who are fed primarily pre-packaged formula) to BPA. As a result, BPA in baby bottles is banned in Canada.
With BPA being considered a toxic substance already, the Government of Canada is in a position to further regulate the use of the substance if it feels that this new study or other research warrants greater restrictions or bans.
However, Canadians probably shouldn’t count on that being among the top priorities of the Harper government. As consumers, we need to demand better and protect ourselves.
SIGN THE CARE2 PETITION: Choose Kids, Not Chemicals: Ban BPA!
Annie blogs about the art and science of parenting at the PhD in Parenting blog.
Photo Credit: Kyle Leboeuf on flickr