Tuesday, March 27, 2012

The Real Cause of the Global Obesity Epidemic


World Wide Obesity Epidemic

Some 68% of all Americans are overweight, and obesity has almost doubled in the last couple of decades worldwide. As International Business Tribune reports:
Studies conducted jointly by researchers at Imperial College London and Harvard University, published in the medical journal The Lancet, show that obesity worldwide almost doubled in the decades between 1980 and 2008.
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68 per cent of Americans were found to be overweight while close to 34 percent were obese.
Sure, people are eating too much and exercising too little. And additives like high fructose corn syrup – which are added to many processed foods – are stuffing us with empty calories.
But given that there is an epidemic of obesity even in 6 month old infants (see below), there is clearly something else going on as well.

Are Toxic Chemicals Making Us Fat?

The toxins all around us might be making us fat.
As the Washington Post reported in 2007:
Several recent animal studies suggest that environmental exposure to widely used chemicals may also help make people fat.
The evidence is preliminary, but a number of researchers are pursuing indications that the chemicals, which have been shown to cause abnormal changes in animals’ sexual development, can also trigger fat-cell activity — a process scientists call adipogenesis.
The chemicals under scrutiny are used in products from marine paints and pesticides to food and beverage containers. A study by the Centers for Disease Control and Prevention found one chemical, bisphenol A, in 95 percent of the people tested, at levels at or above those that affected development in animals.
These findings were presented at last month’s annual meeting of the American Association for the Advancement of Science. A spokesman for the chemical industry later dismissed the concerns, but Jerry Heindel, a top official of the National Institute of Environmental Health Sciences (NIEHS), who chaired the AAAS session, said the suspected link between obesity and exposure to “endocrine disrupters,” as the chemicals are called because of their hormone-like effects, is “plausible and possible.”
Bruce Blumberg, a developmental and cell biologist at the University of California at Irvine, one of those presenting research at the meeting, called them “obesogens” — chemicals that promote obesity.
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Exposed mice became obese adults and remained obese even on reduced calorie and increased exercise regimes. Like tributyltin, DES appeared to permanently disrupt the hormonal mechanisms regulating body weight.
“Once these genetic changes happen in utero, they are irreversible and with the individual for life,” Newbold said.
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“Exposure to bisphenol A is continuous,” said Frederick vom Saal, professor of biological sciences at the University of Missouri at Columbia. Bisphenol A is an ingredient in polycarbonate plastics used in many products, including refillable water containers and baby bottles, and in epoxy resins that line the inside of food cans and are used as dental sealants. [It is also added to store receipts.] In 2003, U.S. industry consumed about 2 billion pounds of bisphenol A.
Researchers have studied bisphenol A’s effects on estrogen function for more than a decade. Vom Saal’s research indicates that developmental exposure to low doses of bisphenol A activates genetic mechanisms that promote fat-cell activity. “These in-utero effects are lifetime effects, and they occur at phenomenally small levels” of exposure, vom Saal said.
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Research into the impact of endocrine-disrupting chemicals on obesity has been done only in laboratory animals, but the genetic receptors that control fat cell activity are functionally identical across species. “They work virtually the same way in fish as they do in rodents and humans,” Blumberg said. “Fat cells are an endocrine organ.”
Ongoing studies are monitoring human levels of bisphenol A, but none have been done of tributyltin, which has been used since the 1960s and is persistent in the marine food web. “Tributyltin is the only endocrine disrupting chemical that has been shown without substantial argument to have an effect at levels at which it’s found in the environment,” Blumberg said.
Concern over tributyltin’s reproductive effects on marine animals has resulted in an international agreement discontinuing its use in anti-fouling paints used on ships. The EPA has said it plans next year to assess its other applications, including as an antimicrobial agent in livestock operations, fish hatcheries and hospitals.
Bisphenol A is approved by the Food and Drug Administration for use in consumer products, and the agency says the amount of bisphenol A or tributyltin that might leach from products is too low to be of concern. But the National Toxicology Program, part of the National Institutes of Health, is reviewing bisphenol A, and concerns about its estrogenic effects prompted California legislators to propose banning it from certain products sold in-state, a move industry has fought vigorously.
Read the rest  here 
http://beforeitsnews.com/story/1906/575/The_Real_Cause_of_the_Global_Obesity_Epidemic.html 

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