I have wondered for a while about eating stale cereal, crackers, chips, etc. I'm talking things that were crisp but now have that strange chewy texture. I know bread goes stale from losing moisture, so I assume cereal goes stale by picking up moisture?
Anyway I find myself often eating stale dry goods I find in the cupboards (things opened several weeks prior). Are stale foods like this safe to eat? I know they won't kill me or give me food poisoning, but on occasion they make me feel a bit nasty afterward, though not enough to stop doing it obviously.