Calcium absorbability from spinach

R. P. Heaney, C. M. Weaver, Robert R. Recker

Research output: Contribution to journalArticle

145 Citations (Scopus)

Abstract

The absorbability of calcium from spinach was compared with the absorbability of Ca from milk in 13 healthy adults in a randomized cross-over design in which the test meal of either milk or spinach had 200 mg of Ca labeled with 45Ca. Absorption was measured by the standard double-isotope method in which both the test food and the miscible Ca pool are labeled with different Ca tracers. Measurement of both Ca and oxalate in our test spinach revealed a very slight stoichiometric excess of oxalate; hence it is likely that all of the spinach Ca was effectively bound. Absorption was higher from milk in every case, with the mean absorption from milk averaging 27.6% and from spinach, 5.1%. The mean within-subject difference between Ca absorption from milk and from spinach was 22.5 ± 9.5% (P <0.0001). These results conclusively establish that spinach Ca is much less readily available than milk Ca.

Original languageEnglish
Pages (from-to)707-709
Number of pages3
JournalAmerican Journal of Clinical Nutrition
Volume47
Issue number4
StatePublished - 1988

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Spinacia oleracea
spinach
Milk
Calcium
calcium
milk
test meals
Oxalates
oxalates
Isotopes
Cross-Over Studies
Meals
tracer techniques
isotopes
Food

All Science Journal Classification (ASJC) codes

  • Food Science
  • Medicine (miscellaneous)

Cite this

Calcium absorbability from spinach. / Heaney, R. P.; Weaver, C. M.; Recker, Robert R.

In: American Journal of Clinical Nutrition, Vol. 47, No. 4, 1988, p. 707-709.

Research output: Contribution to journalArticle

Heaney, RP, Weaver, CM & Recker, RR 1988, 'Calcium absorbability from spinach', American Journal of Clinical Nutrition, vol. 47, no. 4, pp. 707-709.
Heaney, R. P. ; Weaver, C. M. ; Recker, Robert R. / Calcium absorbability from spinach. In: American Journal of Clinical Nutrition. 1988 ; Vol. 47, No. 4. pp. 707-709.
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