I'm not a salt person so it has never been something I put in Jasper's food. Besides, I figure he'll get plenty of it when he's older and keeps begging for chips and the like. As for sweets, I try to steer clear of them as much as possible. He has a dairy allergy, which helps (no ice cream, chocolate, etc).
I was talking with my mom about this the other day, and she said that she had me convinced that a graham cracker was a "cookie" until I was almost four. I figure that until he gets one from a friend, there's no reason for him to even know that things like Oreos exist.