Sure. That makes sense physiologically, if you think about membrane potential and hormonal control and kidney capacity. Just like with glucose, it's the spikes

Sure. That makes sense physiologically, if you think about membrane potential and hormonal control and kidney capacity. Just like with glucose, it's the spikes that cause the damage. But it's a lot easier to explain to a non-professional that eating overly salty food is bad for them (which is what the advice reduces to in practice) than try to explain osmolality to them.