From Reuters:

Four years ago, just after giving birth to her second child, the stay-at-home mom heard about BPA, a chemical inside some plastics that can leach into water or food slowly over time, potentially causing serious health problems like cancer. Unwilling to take any risks, she ran to Babies "R" Us, which had a program to exchange baby bottles containing BPA, and walked out with $100 in rebates.

If only life were so easy.

What Sprague didn't realize is that BPA, or bisphenol A, is ubiquitous. Simply put, just about anything you eat that comes out of a can -- from Campbell's Chicken Soup and SpaghettiOs to Diet Coke and BumbleBee Tuna -- contains the same exact chemical.

The exposure to BPA from canned food "is far more extensive" than from plastic bottles, said Shanna Swan, a professor and researcher at the University of Rochester in New York. "It's particularly concerning when it's lining infant formula cans."

BPA is the key compound in epoxy resin linings that keep food fresher longer and prevents it from interacting with metal and altering the taste. It has been linked in some studies of rats and mice to not only cancer but also obesity, diabetes and heart disease.

Trade groups for chemical and can manufacturers say they stand behind the chemical, and point to some studies from governmental health agencies that deem BPA safe and effective for food contact. They also note that its use has substantially reduced deaths from food poisoning.

But in January, the U.S. Food and Drug Administration for the first time expressed "some concern" about BPA. Propelled in part by recent independent scientific studies and also bowing to mounting concern from the public and consumer groups, the agency announced that it would tap $30 million in federal stimulus funds to study the chemical's potential effects on the human body.

Though it is not clear how economically stimulating the study will be, its results are anxiously awaited in industry and consumer circles. The report, due late in 2011, is being done in collaboration with the National Institutes of Health.