Even canned foods bears will try and get into. That said, when we had our food stolen by the bears (first and last time) The only thing we had left was canned food, but even some of the cans had teeth punctured. We figured the bears left the cans alone because they had so many other easily eaten goodies to work with. Also untouched: baby carrots. I would say hang your cans, and put other food in a bear container. Better safe then sorry.
-percious