98% of American Diets Potassium Deficient

Less than 2% of Americans achieve even the recommended minimum adequate intake of potassium due, primarily, to inadequate plant food intake.

If you take any plant, burn it to ash, throw the ash in a pot of water, stir it around, skim it off and then let the water evaporate, you’ll be left with a white residue at the bottom known as pot ash. It has been used since the dawn of history for everything from making soap, glass, fertilizers, and bleach. It was not until 1807, though, when a new element was discovered in this so-called vegetable alkali. They called it pot ashium—potassium. True story, which I bring up only to emphasize the most concentrated source in our diet, plants.

Every cell in the body requires the element potassium to function. As I detail in my 2-min. video 98% of American Diets Potassium Deficient, for much of the last 3 million years or so, we ate so many plants that we probably got 10,000 mg of potassium in our daily diet. Today, we’d be lucky to get 3,000.

Less than 2% of Americans even get the recommended minimum adequate intake of 4,700 a day. To get even the adequate intake, the average American would have to eat like 5 more bananas worth of potassium a day. 98% of Americans eat potassium deficient diets, primarily because they don’t eat enough plants.

Why do we care? A review of all the best studies ever done on potassium intake and it’s relationship to two of our top killers, stroke and heart disease, was recently published in the Journal of the American College of Cardiology. A 1600 mg per day higher potassium intake was associated with a 21% lower risk of stroke. That still wouldn’t get the average American up to the minimum adequate intake, but it might be able to wipe out a fifth of their stroke risk. The paper concludes: “These results support recommendations for higher consumption of potassium-rich foods to prevent vascular diseases.”

What does “potassium-rich foods” mean? Find out in my NutritionFacts.org video pick above. Hint: bananas don’t even make it into the top 50 sources!

People eating plant-based diets are often asked where they get their protein (and have to explain that plants are the preferred source). Maybe they should then ask where people eating conventional diets get their potassium–or their fiber for that matter, see Relieving Yourself of Excess Estrogen. For more on what we evolved to eat, see Paleolithic Lessons.

The banana listing reminds me of a similarly humorous finding about the levels of eyesight-saving nutrients in eggs versus greens. See Egg Industry Blind Spot. Bananas are also kind of pitiful antioxidant-wise (see Best Berries). Is it worth going out of our way to eat plants with the most antioxidants? See Anti-Inflammatory Antioxidants to find out.

In health,
Michael Greger, M.D.

PS: If you haven’t yet, you can subscribe to my videos for free by clicking here and watch my full 2012 year-in-review presentation Uprooting the Leading Causes of Death.

Image credit: Public Domain Photos / Flickr

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Aldana W
Aldana W9 months ago


W. C
W. Cabout a year ago

Thank you.

William C
William Cabout a year ago


Jeanne Rogers
Jeanne R1 years ago

Thank you for sharing.

Elizabeth Brawn
Elizabeth B2 years ago

eating bananas makes me feel better

Robert Roesler
Robert Roesler4 years ago

I have the opposite problem- I was high in potassium on my last blood test a few months ago. I am 61 yo and was fine on everything else. I eat a vegetarian diet (high percentage home-grown) but sometimes cheat with seafood (once a month). My Doctor said it was no big deal but I had the feeling that he didn't know how to interpret it. Is this a concern?

Steve W.
Steve W.4 years ago

Hi Melinda K, you are right this would be better with a list of foods, I found one here though and the info goes really well with the info here: http://www.calories-in-foods.com/foods-high-potassium.php

Pat L.
Patricia L5 years ago

And I certainly do not believe that 98% of Americans are potassium deficient.

Pat L.
Patricia L5 years ago

This doctor speaks as if the average American knows absolutely nothing about diet and nutrition. Well, doctor we are not all 3rd grade intelligent when it comes to knowledge about a healthy diet. As a vegetarian and vegan I had to dig up this information back in the late 70's and figure out how to combine beans, rice and vegetables into healthy meals that included everything necessary for a healthy body. And I followed that old adage, an apple a day keeps the doctor away. For the past thirty or so years, I've eaten more than 370 apples a year, not counting apple compote, pie and the ones in my veggie stuffing at holidays. I have also taken a multivitamin since I was a child when my Dad would hand them out at breakfast. There are many people like me who don't eat junk and have more than a passing knowledge of health. I must say listening to him cavalierly misstate what was printed (as if the information behind his words were too difficult to comprehend) and the slight sarcasm in his voice did not attract me. I went on his website, and consider this video to be more of an infomercial than anything else. The fact that he didn't speak about the benefits of organic fruits and vegetables also turned me off. Oh, raspberries to you doctor.

Holly W.
Holly W5 years ago

"Greens, beans, and dates" high on the list? I thought for a moment of combining 'em with the 1st-ranking tomatoes in an exotic sort of casserole, but maybe that's not necessary.