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Potassium
Most adults eat about two-thirds of the potassium their body wants. It's a quiet shortfall: you never feel it, but it nudges blood pressure up for decades and stacks the odds on a stroke and a first kidney stone. The fix is cheap and boring. Eat more whole-food potassium, and swap your table salt for a half-potassium blend. Across nearly 21,000 adults, that one swap cut strokes by 14% and deaths by 12% over five years Neal et al. 2021.
Do ยท Daily Evidence Moderate Chapter Food

The salt swap is the strongest single move. Rural-Chinese adults at high stroke risk who cooked with a 75% salt, 25% potassium-chloride blend instead of ordinary salt had 14% fewer strokes and 12% lower overall mortality over five years 1. Other populations show the same direction 2. It's one product on one shelf.

Blood pressure is the lever underneath it. Raising potassium to guideline levels drops systolic pressure about 3 points in healthy adults and closer to 7 in people already running high 3. Seven points is what a starter blood-pressure pill buys, except the source is your plate.

It's also the best-studied thing for kidney stones. In two large Harvard cohorts, the people eating the most potassium had 35% to 51% fewer first stones 4 5. Potassium pulls citrate into the urine, where it grabs calcium before calcium can find oxalate and start a stone.

Add one potassium food to most plates, then fix the shaker. Food closes most of the gap; the salt swap covers the rest.

Do the food first, the shaker second. Together they clear the 3,400 mg target without anyone counting milligrams 6.

The cuff moves first, then the odds.

  • Two to four weeks: systolic pressure starts drifting down, 5 to 10 points if you were high, 2 or 3 if you weren't 3. You won't feel it; a home monitor shows it.
  • Several years: the stroke and heart-event curves bend, and the gap widens the longer you keep it up 1.
  • Decades: fewer strokes, fewer stones. It arrives as the absence of bad news rather than any feeling of change.
The fine print โ€” when to skip it, and what people get wrong

Healthy kidneys dump extra potassium easily; whole food is essentially risk-free. The concentrated salt substitute is the part to check on.

The banana is a middling source (420 mg); potatoes, beans, spinach, and avocado all carry more. Muscle cramps are mostly not a potassium problem; sweat is sodium-heavy, and cramps trace to tired misfiring muscle, not diet 7. Pills aren't food potassium; capped at 99 mg a dose, they skip the citrate and fibre that come packaged with a potato.

References
  1. 1Neal B, Wu Y, Feng X, et al. (2021). Effect of Salt Substitution on Cardiovascular Events and Death (SSaSS). New England Journal of Medicine. link
  2. 2Yin X, Rodgers A, Perkovic A, et al. (2022). Effects of salt substitutes on clinical outcomes: a systematic review and meta-analysis. Heart. link
  3. 3Filippini T, Naska A, Kasdagli MI, et al. (2020). Potassium Intake and Blood Pressure: A Dose-Response Meta-Analysis of Randomized Controlled Trials. Journal of the American Heart Association. link
  4. 4Curhan GC, Willett WC, Rimm EB, Stampfer MJ (1993). A prospective study of dietary calcium and other nutrients and the risk of symptomatic kidney stones. New England Journal of Medicine. link
  5. 5Curhan GC, Willett WC, Speizer FE, Spiegelman D, Stampfer MJ (1997). Comparison of dietary calcium with supplemental calcium and other nutrients as factors affecting the risk for kidney stones in women. Annals of Internal Medicine. link
  6. 6Whelton PK, Carey RM, Aronow WS, et al. (2018). 2017 ACC/AHA Guideline for the Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults. Hypertension. link
  7. 7Maughan RJ, Shirreffs SM (2007). Muscle cramping during exercise: causes, solutions, and questions remaining. Sports Medicine. link
Related in the handbook (7)
Helps
  • โ€” More potassium and less sodium nudges blood pressure down โ€” a quiet lever in any hypertension plan.
Works well with
  • โ€” You won't feel potassium working โ€” your blood pressure will. A home cuff is how you actually see the payoff.
Related
  • โ€” As kidney function drops, potassium piles up instead of clearing โ€” go easy on potassium salts and high-potassium loading.
  • โ€” The electrolyte most diets run short on is potassium; its ratio to sodium is the whole game.
  • โ€” If potassium stays low despite a good diet, low magnesium is often the hidden reason; fixing one helps the other stick.
  • โ€” These substitutes work by swapping sodium for potassium chloride โ€” it's really a way of eating more potassium without thinking about it.
  • โ€” Swapping to a potassium-blend salt is the easy win โ€” just check it's still iodized, or you trade one gap for another.
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