polymathwannabe comments on Open thread, September 22-28, 2014 - Less Wrong Discussion
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Everything in balance.
Sure, but by default we suffer from mild hypokalemia and mild hypernatremia, not the other way round. Obviously you shouldn't cut out all sodium, and unless you do something stupid you're not really at risk of that.
Healthy kidneys will simply remove the excess potassium unless the intake is ridiculously high.
However the RDA could quickly get dangerous if you get kidney failure for any reason.
The fact that it's possible to have too much and it's possible to have too little does not tell you how much you need.