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> does exercise purge "extra" salt?

No. Your kidneys do this, assuming they work correctly.

When I first heard about that Kirin invention I heard about chopsticks also, so maybe it is in the works

> The researchers behind it first published their thesis in 2011, but have since made spoons, forks, and chopsticks that pass electric currents into food.

Not really. Of course you tend to drink and sweat more, which contributes.

> I was wondering, does exercise purge "extra" salt?

IIRC sweating is the only way for the body to get rid of salt, so on paper, yes. But it's probably not as simple as that.

I'm pretty sure you pee it out too.

No. Absolutely no. The kidneys take care of it pretty good.