Dietary magnesium intake and the concentration of magnesium in plasma and erythrocytes of postpartum women.

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Abstract
Dietary magnesium intakes and concentrations of magnesium in plasma and erythrocytes were determined in 23 lactating and 13 nonlactating healthy pregnant women from 37 wk of gestation through 6 mo postpartum. Food composites, collected for 3 days, were analyzed for magnesium, and energy intake was calculated from 3-day dietary records. The lactating women consumed significantly greater (P less than .05) amounts of magnesium and energy than the nonlactating women. Mean postpartum intake of magnesium was 55% of the recommended dietary allowance (RDA) for lactating women and 48% of the RDA for nonlactating women. Neither lactation nor length of lactation significantly affected plasma magnesium concentration or erythrocyte magnesium concentration. Dietary magnesium intake was not significantly correlated with the level of magnesium in either the plasma or erythrocytes.