The Harvard Health Letter describes several key nutrients that work in pairs:
Vitamin D and calcium: Like most nutrients, calcium is absorbed primarily in the small intestine. If large quantities are present, the body can easily absorb it. But in smaller amounts, the mineral gets absorbed with active assistance from vitamin D. Right now, official nutrition guidelines recommend that adults get 1,000 mg of calcium and 400 IU of vitamin D daily. And some experts say a much higher vitamin D intake—1,000 IU daily or more—is even better.
Sodium and potassium: Although sodium is an essential nutrient, the average American consumes far more of it each day than he or she needs. Too much sodium can boost blood pressure, and with it, the chances of having a stroke or heart attack. Potassium counters the harmful cardiovascular effects of a surplus of sodium by encouraging the kidneys to excrete sodium. Many studies have shown a connection between high potassium intake and lower blood pressure. In fact, the potassium-to-sodium ratio may be more important than potassium—or sodium—alone.
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