By Amy Norton, Reuters August 17, 2011

People with relatively high levels of certain pesticides in their blood may have an increased risk of Type 2 diabetes -- particularly if they are overweight, a new study suggests.

The study, reported in the journal Diabetes Care, is not the first to link chemical pollutants to diabetes.

A number of studies have found a connection between diabetes risk and exposure to older pesticides known as organochlorines, PCBs and other chemicals that fall into the category of "persistent organic pollutants."

Organochlorines are now banned or restricted in the U.S. and other developed countries, after research linked them to cancer and other potential health risks. PCBs, which were once used in everything from appliances to fluorescent lighting to insecticides, were banned in the 1970s.

However, as the name suggests, persistent organic pollutants remain in the environment for years and build up in animal and human body fat.

In the U.S., diet is the main potential source of exposure, according to the Centers for Disease Control and Prevention (CDC) -- with fatty foods, like dairy products and oily fish, topping the list.

Lab research has suggested that some persistent organic pollutants impair the body's ability to regulate blood sugar, which could help explain the link to Type 2 diabetes.


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