Bisphenol-A (BPA) is an estrogenic-like chemical used in many plastic products. BPA can can interfere with hormones and normal development in children and has been linked to everything from infertility to diabetes to heart disease. Some products—such as sippy cups for toddlers—advertise themselves as being "BPA-free".
The presence of BPA in the linings of many canned products has been less publicized. Several manufacturers, such as Eden Organics, have voluntarily stopped lining their cans with BPA. Weruva is one of the few pet food companies to have canned food with BPA-free linings.
Four Swedish reporters decided to do some informal research about BPA in canned foods. They ate nothing but canned food for two days and doctors found that their BPA levels rose between 2,800 and 4,600 percent. These levels are below what the Swedish government estimates to be safe, though what is a safe level of BPA is still being debated. Since April 2012, the Swedish government outlawed the use of BPA in food packaging for children under three, but adults are left to take their own precautions.
The Environmental Working Group (EWG) has some tips to help people avoid BPA. They have been urging legislation to phase out BPA from consumer products, but this has yet to happen.