Your kidneys have a built-in system to adjust salt and water levels to keep blood pressure stable.

“The kidneys respond to that pressurize by activating the renal angotensin aldoststerone system, which is essentially your body's emergency pressure regulating network. When blood pressure climbs, the kidneys sense it and start excreting more sodium and water to bring the volume back down. When your pressure drops, the kidneys hold on to sodium to prevent the system from collapsing. This is a tightly controlled feedback loop and in a healthy metabolic state, it works beautifully.”