you bring up a lot of good points. salt above us. hhmmmmm. i know salt is very therapeutic. breathing it in is said to be very good for you.
as for the age of people - i believe many things transpired to decrease lifespan, but none so egregious as what man chooses to do himself. if all food is toxic, then there came a time when man ate very little and drank very little - everything he needed was in the air. this does not seem likely to me under todays conditions. i believe true breatharians could only exist before the firmament fell and exposed us to more cosmic radiation.