BPA is a synthetic estrogen. It's widely known to be found in a lot of types of plastic water bottles, leading to the metal bottle fad. Now we know it's in most canned foods, thanks to the linings used. On BPA (from Scientific American): Just How Harmful Are Bisphenol-A Plastics?: Scientific American BPA in canned food: Consumer Reports Tests Why do we trust corporations again? Why do we allow them to get away with this sort of thing? (Don't bother - that's a rhetorical question and I already know the answer.) What's more, why don't we have regulations that prevent the use of chemicals in consumer products until they are known to be safe? (That's another rhetorical question.) Finally, all you conspiracy theorists can now formulate interesting approaches to understanding why American men are so sedate.