You must have pretty good blood pressure then!
Yeah. Don't you need salt to live?
Does the speaker mean that she never eats salt or that she isn't eating it right now?
It could mean either, but I would assume she meant the former (in an "I never add salt when I cook" or "I avoid salt as best I can" sort of way, rather than literally).
How can I say "I am not eating salt"? Like I'm not eating salt right now?
The same way.