The People’s Pharmacy
About that plastic in food
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It’s invisible, tasteless and odorless, and yet it is found in many of the foods and beverages that we consume. It is BPA, short for bisphenol A.
BPA is a synthetic estrogen that has measurable biological effects. What is it doing in our food?
The December issue of Consumer Reports revealed that many common products, including some brands of canned green beans, vegetable soup and chicken noodle soup, contain surprising levels of BPA. Experts for CR calculated that an adult eating just one serving of canned green beans from the sample would get about 80 times more BPA than the recommended daily upper limit.
Vegetables don’t come with BPA in them naturally. The compound is presumably leaching out of the linings of metal cans. Cans are usually lined with an epoxy that uses BPA in its makeup. Although some soft-drink and beer cans also may have such linings, CR did not report testing the beverages.
Many people are aware of a controversy over BPA in hard-plastic (polycarbonate) water and baby bottles. Infants are more sensitive to environmental exposures, and there is concern that being exposed to synthetic estrogen at an early age could lead to developmental problems. Canada banned BPAcontaining baby bottles from the market, and many manufacturers in the United States now offer BPA-free alternatives.
In animals, even low-level exposure to BPA in utero or early infancy can lead to genital abnormalities. It makes female animals more likely to develop breast cancer (Reproductive Toxicology, November/ December 2008) and male animals more susceptible to prostate cancer (Basic and Clinical Pharmacology and Toxicology, February 2008). Exposed animals also may have higher cholesterol levels and are more likely to be fat and to develop diabetes (Journal of Atherosclerosis and Thrombosis, Vol. 14, No. 5, 2007).
Deliberately exposing human babies to this hormone disrupter to see what effects it has would be unethical. And yet we are all exposed. About 92 percent of Americans who have been tested have measurable amounts of BPA in their urine.
Although some skeptics have expressed doubt that this has relevance for health, a recent report from China demonstrates that adult men exposed to relatively high levels of BPA on the job were four times more likely than non-exposed workers to report sexual difficulties such as lowered libido, reduced satisfaction and erectile dysfunction (Human Reproduction online, Nov. 10, 2009).
The Chinese research is very recent, but we have been tracking reports of trouble with BPA for some time. Anyone who would like to hear some of the country’s leading experts on estrogen discuss their concerns and recommendations about BPA may be interested in our hourlong interview on Sex Hormone Disruption. The CD is available for $9.99 plus $2 shipping and handling from Graedon Enterprises (Dept CD-670), P. O. Box 52027, Durham, NC 27717-2027. It can be downloaded as an MP3 at www.peoplespharmacy.com . It is possible to reduce levels of BPA in food packaging. The Japanese removed it from cans several years ago and found that BPA levels in people dropped dramatically. Choosing foods and beverages carefully may reduce our exposure as well.
In their column, Joe and Teresa Graedon answer letters from readers. E-mail them via their Web site: www.PeoplesPharmacy.com .
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