Should I worry about sodium?
Sodium matters, but don't drop the context. It is an electrolyte that supports fluid balance, nerve function, and muscle contraction. People who sweat heavily, train in heat, or eat mostly minimally processed foods may need more deliberate sodium than they expect.
For blood pressure and cardiovascular risk, some people need to moderate sodium, especially under medical guidance. For scale interpretation, sodium can cause water retention, so a salty restaurant meal can raise weight temporarily without fat gain.
The practical target is consistency. Large swings in sodium make body-weight trends more difficult to read.