Ever wonder what's the best thing to do with expired canned food? It happens to even the most organized of us, but expired food can be dangerous if consumed. It can also be dangerous to even open the can. While it may be greener to open the canned food, toss the expired food and recycle the can, you risk exposing yourself to dangerous bacteria. If a can is more than two months past the expiration date, bacteria and fungus can grow inside. Open the can and those spores can be released into your kitchen. Instead, throw away the can intact.