Something to curb the usage of large amounts of salt in a short time would improve the way salt is treated in general, from trades to mass eating of salt. Had a few ideas for this:
-Stamina Debuff: Decrease the maximum amount of stamina by 5-10%. Debuff could last a day or so, but I lean to having it last longer.
-Some sort of HHP wound due to eating more than one salt a day.
-A flat time gate between eating salt. A day at least, maybe more.
-Decrease the efficiency of salt as you eat more. Basically giving it a satiation that decreases over time rather than with any drinks.