Yep, some folks traditionally use Monosodium Glutamate to flavor their food, some Sodium Chloride, and others use Nitrates. Different strokes for different folks.
I don't know how common it is for people to become allergic to salt, though it seems like such an allergy would constitute a death sentence.
I am beginning to believe that we will have to be the death of about 50 turkeys a year, after all. I don't think I want to try barbequing a fungal turkey.