Minerals

Potassium

The blood pressure mineral most diets lack.

~98% of Americans do not meet the adequate intake for potassium

Why it matters for longevity

Potassium is essential for maintaining normal blood pressure, fluid balance, and nerve-muscle communication. It counteracts the hypertensive effects of sodium. A meta-analysis in the BMJ found that increasing potassium intake to 3,500-4,700mg daily was associated with a 24% lower risk of stroke. Blue Zone populations consistently consume potassium-rich diets built around beans, greens, and fruit.

How much you need

RDA

2,600mg for women, 3,400mg for men (adequate intake)

Optimal

Longevity researchers recommend 3,500-4,700mg daily, prioritizing food sources over supplements.

Signs you might be low

  • Muscle cramps and weakness
  • High blood pressure
  • Fatigue and lethargy
  • Heart palpitations or irregular heartbeat

Best food sources

FoodPer serving
Sweet potato (1 medium)541mg
White beans, cooked (1 cup)1,004mg
Banana (1 medium)422mg
Spinach, cooked (1 cup)839mg
Salmon (3 oz)534mg

Key research

Aburto NJ et al. (2013). Effect of increased potassium intake on cardiovascular risk factors and disease. BMJ, 346, f1378.

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