Within about 6 hours of exposure, our liver metabolizes about half the concentration. Most of that — about 80 to 90 percent — is converted into a metabolite called BPA-Glucuronide, which is eventually excreted.
Not all cells will accumulate lipids, said Thomas Zoeller, a University of Massachusetts Amherst professor who was not involved in the study. The liver is our body's filter, but it doesn't always neutralize harmful compounds. BPA already has been linked to obesity in both human and animal studies.
Health Canada researchers were only looking at this one possible health outcome. Industry representatives, however, argue the doses used were much higher than what would be found in people. Previous studies similar to this one have found associations between bisphenols and obesity , and toxicological studies in mice have suggested that these chemicals play a role by making fat cells bigger and decreasing adiponectin, a hormone that helps regulate blood sugar levels.
One thing that complicates the results is that people who eat more are not only more likely to be obese, but also more likely to be exposed to more food packaging that contains bisphenol chemicals.
However, when the researchers controlled for caloric intake, they did not have substantial differences in their findings. Many products are now labeled BPA-free, but not as many are labeled as BPS- or BPF-free, and it can be hard for consumers to tell if a product contains these chemicals. Some researchers recommend precautionary measures such as avoiding touching receipts , but since bisphenol chemicals are in so many everyday products, exposure can be hard to avoid.
Since bisphenol chemicals are so commonly used, their health effects need to continue to be researched and monitored, said the study's authors. As insects become more scarce, our world will slowly grind to a halt, for it cannot function without them. EHN talked to people with disabilities put in increased danger during last summer's Pacific Northwest heat waves. Activists say accessible cooling centers and air conditioning are key to combating this injustice.
By Lindsey Konkel. September 2, at am. Animal studies have linked obesity and other health problems with exposure to bisphenol A BPA. Concerns over BPA health impacts led manufacturers to start phasing out the chemical in products that make contact with foods and drinks.
Now a study in children and teens suggests that even some BPA substitutes may foster weight gain. The group described its findings on July 25 in the Journal of the Endocrine Society. At least in animals, BPA can mimic estrogens, a type of hormone. The new data suggest some BPA substitutes also may be hormone mimics. Phthalates are chemicals used to make plastics soft and flexible. Summary Phthalates are chemicals found in many plastic products.
Some studies show a link between phthalate exposure and obesity, type 2 diabetes and genital malformations in boys.
Atrazine is one of the most widely used herbicides in the US. Summary Atrazine is a commonly used herbicide. Several studies have associated atrazine exposure with an increased obesity risk, and high levels may promote weight gain in mice. Organotins are a class of artificial chemicals used for various industrial purposes. Summary Organotins, including tributyltin, are compounds that have been shown to cause weight gain and fatty liver disease in mice.
They may signal to stem cells to turn into fat cells. Perfluorooctanoic acid PFOA is a synthetic compound used for various purposes. However, whether PFOAs really contribute to obesity in humans remains to be seen. Summary Perfluorooctanoic acid is found in non-stick cookware and other products. It is also associated with various diseases in humans and one mouse study shows that prenatal exposure leads to weight gain in mid-life. How to Minimize Your Exposure to Obesogens.
It is downright impossible to avoid them completely, because they are literally everywhere. Avoid foods and beverages that have been stored in plastic containers. Use stainless steel or quality aluminum water bottles instead of plastic. Do not feed your babies from plastic bottles. Use glass bottles instead. Instead of non-stick cookware, use cast iron or stainless steel. Use organic, natural cosmetics. Summary Avoiding obesogens completely is impossible, but you can reduce your exposure by avoiding food or drinks stored in plastic containers.
Also consider using cookware made of stainless steel or cast iron. The Bottom Line. Most of the data is observational and based on studies in lab animals I do not know whether these chemicals will ever be proven to cause harm, but I am personally not going to wait around for that to happen. Read this next. Artificial Sweeteners: Good or Bad? Food Dyes: Harmless or Harmful?
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