Potassium intake and the calcium economy

Karen Rafferty, K. Michael Davies, Robert P. Heaney

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Background: Dietary potassium intake (K) lowers urinary calcium (Ca) excretion and, in short-term studies, may improve Ca balance. Purpose: Our objective was to assess K effects on the Ca economy under steady-state conditions. Design: 8-day, inpatient metabolic studies of nitrogen, phosphorus, and Ca balance, combined with dual isotopic Ca tracer kinetics studies. Study diet matched to prestudy nutrient intakes. Subjects: 191 single women studied from 1-5 times at ∼5-year intervals, for a total of 644 inpatient studies. Median age at time of study: 50.2 yrs; 301 studies were performed postmenopausally without hormone replacement; 343 were either premenopausal or postmenopausal but on estrogen replacement therapy. Results: Dietary K was highly significantly associated with urinary Ca excretion, with a coefficient of -0.0109 mmol urine Ca/mmol diet K. However, dietary K was negatively correlated with dual-tracer Ca absorption (coefficient for Ca absorption fraction: -0.00094/mmol dietary K), and was not associated with urine Ca after adjustment for Ca absorption. Conclusion: While a high K diet (i.e., one rich in fruits, vegetables, and dairy products) has multiple health benefits and clearly lowers urine Ca, it does not seem to exert any appreciable net influence on the Ca economy, largely because the reduced calciuria is offset by reduction of intestinal absorption. We note, however, that since the high K intakes in our studies come more from milk and meat than from fruits and vegetables, we cannot exclude a possible balance effect for different food sources of K.

Original languageEnglish
Pages (from-to)99-106
Number of pages8
JournalJournal of the American College of Nutrition
Volume24
Issue number2
StatePublished - Apr 2005

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Potassium
potassium
Calcium
calcium
urine
Urine
Diet
tracer techniques
Inpatients
Fruit
estrogen replacement therapy
excretion
Dietary Potassium
vegetable products
Food
Estrogen Replacement Therapy
metabolic studies
Time and Motion Studies
Dairy Products
intestinal absorption

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Food Science

Cite this

Rafferty, K., Davies, K. M., & Heaney, R. P. (2005). Potassium intake and the calcium economy. Journal of the American College of Nutrition, 24(2), 99-106.

Potassium intake and the calcium economy. / Rafferty, Karen; Davies, K. Michael; Heaney, Robert P.

In: Journal of the American College of Nutrition, Vol. 24, No. 2, 04.2005, p. 99-106.

Research output: Contribution to journalArticle

Rafferty, K, Davies, KM & Heaney, RP 2005, 'Potassium intake and the calcium economy', Journal of the American College of Nutrition, vol. 24, no. 2, pp. 99-106.
Rafferty K, Davies KM, Heaney RP. Potassium intake and the calcium economy. Journal of the American College of Nutrition. 2005 Apr;24(2):99-106.
Rafferty, Karen ; Davies, K. Michael ; Heaney, Robert P. / Potassium intake and the calcium economy. In: Journal of the American College of Nutrition. 2005 ; Vol. 24, No. 2. pp. 99-106.
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