08/24/2026
In 1957, a Danish doctor named Jens Christian Skou was studying anesthesia at the University of Aarhus when he got sidetracked by crab nerves.
He was dissecting the nerve membranes of shore crabs, trying to understand how anesthetics work at the cellular level. And while poking around in there, he found something that had nothing to do with anesthesia at all.
An enzyme. Sitting inside the cell membrane. Doing something that shouldn't have been possible.
It was pumping sodium out of the cell and pulling potassium in. Three sodium ions out, two potassium in. Millions of times per second, in every cell.
Skou knew this was important. But he was so cautious about the finding that he left the word "pump" out of his paper title entirely. He later said he thought it was too provocative.
Forty years later, Stockholm called. He won the Nobel Prize in Chemistry in 1997 for discovering what turned out to be one of the most important mechanisms in human biology.
That pump runs in every cell in your body right now. It uses roughly a quarter of all the energy you burn in a day. In your brain, closer to 70%.
And it does something directly relevant to a question that about one in three American adults are living with today.
Blood pressure.
The pump's whole job is balance. Sodium on one side, potassium on the other. When that ratio tilts too far toward sodium, your blood vessels tighten and your blood pressure climbs.
For the last 50 years, nearly every piece of public health advice about blood pressure has focused on one half of that equation.
Cut the salt. Read the label.
That advice is sound. But it only covers half of what Skou's pump is actually doing.
The other half of the equation is potassium. And almost nobody gets told about it.
The recommended daily intake for adults is around 4,700 milligrams. The average American gets about 2,640. That's barely more than half.
So most people aren't just eating too much sodium. They're not getting nearly enough of the mineral that's supposed to counterbalance it. The ratio is off on both sides, and only one side gets mentioned at the doctor's office.
Potassium helps relax the smooth muscle lining your artery walls. It also helps your kidneys push excess sodium and fluid out of your body. Both of those things support healthier blood pressure, quietly, without you having to think about it, as long as there's enough potassium coming in.
And then there's magnesium.
Magnesium works alongside potassium, and most people don't get enough of that either. It acts as a natural regulator of calcium activity in your blood vessel walls. Too much calcium activity in those walls is part of what causes them to tighten.
That mechanism, by the way, is very similar to what a common category of blood pressure medication, calcium channel blockers, is designed to do. Your body already has a version of that system. Magnesium helps keep it running.
But before anyone reaches for a supplement bottle, a necessary word.
Potassium in large amounts can be dangerous for people with kidney disease or anyone on certain blood pressure medications, including some diuretics and ACE inhibitors. Those conditions and medications already affect how your body handles potassium, and adding more can push levels into unsafe territory.
The safest path to more potassium and magnesium for most people is food. Leafy greens and bananas, beans and nuts. Not high-dose pills. And never a decision made without your doctor if you're already on blood pressure medication.
Nobody should stop a prescribed medication or change their diet based on a Facebook post. Including this one.
But here's the quiet part.
Skou found that pump in 1957 by dissecting crab nerves in a small university lab in Denmark. He wasn't looking for anything to do with blood pressure. He was trying to understand anesthesia. The pump found him.
And the pump's message has always been the same thing Skou saw in those crab cells nearly 70 years ago. Sodium and potassium aren't opponents. They're partners. The system only works when both sides are present.
For 50 years, we've been told to push one side down. Almost nobody mentions pulling the other side up.
Has your doctor ever talked to you specifically about potassium or magnesium, or has it always just been about the salt?
Tell us below.