Why? Several factors limit the shelf-life of canned foods. Cans or metal lids on glass jars can rust. When rust is deep enough, tiny holes open in the can or lid that may let spoilage agents in.

This staple canned good is a great thing to keep on hand, and since those soft red fruits are easy to crush or cut at home, a can of whole tomatoes is a much more versatile choice than one that's ...