Because can linings are often plastic resins that use bisphenol A as the precursor chemical to make them.
To add to Mr. Gibson’s remark, plastic can linings are designed to keep the can from flavoring the food. Foods stored in unlined metal cans (especially acidic foods like tomato sauce) pick up metallic flavors from the can. The longer they’re stored, the more metallic taste they pick up. There are some can linings that don’t use Bisphenol A, but they probably use some nefarious chemical cousin that may be just as bad.
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