I've eaten lunch with people that take a bite out of a hamburger, and then sprinkle on a 1/2 tsp of salt, take another bite, and repeat. The ketchup on the burger had 500mg of sodium alone. That's scared me, but they weren't people that wanted advice so my mouth was zipped shut.
I've noticed when I occasionally eat at a fast food joint I get thirsty about 2 hours later. That's the sodium causing water absorption.
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