Recently I've discovered that, if there is a little bit of salt on an item, say fish, and you need to increase that saltiness, lemon will bring it out.  If something has the wrong kind of sodium--sometimes it's MSG; sometimes it's a different sodium additive--I can feel its effect on my legs immediately.  It's not exactly direct pain; more a feeling of pressure, maybe a bit of crushing.  Elevation helps then.  If I drink enough water, fast enough, I can flush the bloatium from my system.