By drinking pray blood. It is still common in some yakut regions which people practice old ways and deer breeding.
Some animals like deer and mountain goats are really cunning in finding salt and thus their blood and meet full of sodium.
In ocian coast it was common to filtrate eater through sand to get some ocian salt.
Some greek islands practiced to gather salt from roofs after storms.
You know who else needs, and thus has salt? The bodies of virtually any other animal on planet Earth.
Actually, what’s even my point? Plenty of edible plants have salt in them. There’s salt in soil. There’s salt in ocean water. There’s salt in… grass. There’s salt friggin everywhere, and we are evolved to detect it quite easily. You sprinkle a tiiiny bit of this stuff on something and WHAM, changes the whole flavor profile. Sufficient salt intake was probably the least of our ancestor’s worries.
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