The premise of AI is that the body cannot hold
sodium. That is the that cause of a crisis - in most,
sodium crashes
and potassium spikes (in some, like me, both crash) so craving salt or low sodium is a hallmark of Addison's or AI. After activity or sweating, I usually have tomato juice or pickles to replace sodium.
It seems a lot of us have low iron, low D etc. - not sure why but I have the same.
Does he have a medic alert bracelet (or something) and an emergency kit?