Dietary phytate × calcium/zinc millimolar ratios and zinc nutriture in some Ontario preschool children

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Abstract
Millimolar ratios of phytate/Zn, Ca × phytate/Zn, and Ca × phytate/Zn per 4.2 MJ were calculated from 3-d weighed-food records collected from 62 male (M) (mean age: 58±7 mo [mean±SD]) and 44 female (F) (mean age: 58±6 mo) preschool children from Southern Ontario. Food-composition values for phytate were based on laboratory analysis and the literature. No gender differences existed for median millimolar ratios of phytate/Zn (median: M, 5.3; F, 5.3), and Ca × phytate/Zn per 4.2 MJ (M, 68.1; F, 59.5), but median intakes of phytate (M, 399; F, 333 mg/d) and median millimolar ratios of Ca × phytate/Zn (median: M, 102.1; F, 72. 3;pp=0.06) and Ca × phytate/Zn per 4.2 MJ (p=0.05) were higher in boys with hair zinc p=0.0007), when age and midparent height were treated as covariates. Results suggest that dietary Ca × phytate/Zn millimolar ratios, when expressed per 4.2 MJ, influenced the zinc nutriture of these Southern Ontario boys.