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Associations between iron and zinc nutriture in premenopausal women

Associations between iron and zinc nutriture in premenopausal women

FASEB Journal 17(4-5): Abstract No. 189-6

Iron (Fe) and zinc (Zn) are available from similar foods. To define associations of Fe and Zn nutriture, Fe and Zn indicators including Zn kinetics were measured in 50 healthy premenopausal women. In 30 subjects with plasma Zn > 700 mug/L, serum ferritin (SF), serum Fe, and percent saturation of Fe binding proteins were higher (p< 0.03) than in low Zn subjects. Food frequency correlated with SF and Zn kinetics in 33 subjects not on oral contraceptives. Beef was the positive predictor of SF (p = 0.002); bran cereal (p = 0.097) and bleeding through pads (BTP) (p = 0.021) were negative predictors (n = 32, R2 = 0.326, p = 0.010). Beef positively predicted (p = 0.003) and BTP negatively predicted (p = 0.010) the rapidly exchangeable Zn pool/fat free mass (FFM) (n = 31, R2 = 0.322, p = 0.004). SF correlated with the central Zn pool (Q1, the plasma)/FFM (n = 31, R2 = 0.394, p< 0.0001), the lesser peripheral Zn pool (Q2)/FFM (broken line equation, n = 27, R2 = 0.756, p < 0.0001), and the greater peripheral Zn pool (Q3)/FFM (n=32, R2 = 0.167, p = 0.020). In the broken line model, the breakpoint for Q2 was at SF 17.8 mug/L; below the breakpoint, Q2 tended not to decrease; above the breakpoint, Q2 increased proportionate to SF. In conclusion, 1) Fe and Zn status are highly related; 2) Food frequency correlated with Fe and Zn status; 3) Zn deficiency was associated with SF < 20 mug/L. Support: DAMD 17-95-C-5112 & USPHS M01-RR-00073.

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