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 language | English |
|---|---|
| Pages (from-to) | 707-709 |
| Number of pages | 3 |
| Journal | American Journal of Clinical Nutrition |
| Volume | 47 |
| Issue number | 4 |
| State | Published - 1988 |
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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 journal › Article
}
TY - JOUR
T1 - Calcium absorbability from spinach
AU - Heaney, R. P.
AU - Weaver, C. M.
AU - Recker, Robert R.
PY - 1988
Y1 - 1988
N2 - 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.
AB - 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.
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M3 - Article
C2 - 3354496
AN - SCOPUS:0023916316
VL - 47
SP - 707
EP - 709
JO - American Journal of Clinical Nutrition
JF - American Journal of Clinical Nutrition
SN - 0002-9165
IS - 4
ER -