Cans of Tuna for the Apocalypse

Food's still good for like ages after sort of apocalypse, you know, it's still fine. Some problems can be that if it's quite acidic in the can, it can etch the can and get poised. Like spam is probably like pretty sick. But also I mean, if it's like meat or poultry or something like that, I probably wouldn't really go for it if it was really, really old. If it's off, then it's going to be pretty bad for you.