There does to be a high salt content in fil food (soy sauce is naturally high in it) but there tends to be a lot of MSG thrown in as well. Just wonder if that could have an effect? It is fairly nasty stuff.
There certainly is I don't use any salt when I cook at home, no need to, most of our food contains enough naturally occuring sodium. I'm sure that the Doc can give the medical reasons why salt dehydrates the body and causes water retention in hands and feet