Effect of Zinc Intake on Fetal and Infant Growth Among Chinese Pregnant and Lactating Women

Key words: 
• pregnant women /
• stepwise regression analysis /
• nutrient intake /
• cereal products /
• weight gain

Abstract: The relationship between maternal nutrient intake and fetal size or infant growth was studied in 1956 pregnant women, 599 parturients and 1043 lactating women, 318 non-pregnant women included as controls. The study was conducted in eight regions that were representative of all geographical areas of China. The diet was comprised primarily of cereal products with 70% to 85% of the zinc intake derived from plant sources. Women in the third trimester of pregnancy, parturients and lactating women consumed more food than non-pregnant women or women in the first two trimesters of pregnancy. Total energy, protein and iron intakes met the recommended allowances for each stage of reproduction. Calcium and zinc intakes, however, were 50% and 47% of the amount recommended, respectively. Only 7.2% of the women exceeded two-thirds of the recommended zinc intake. The mean intake of zinc was 6.5mg to 9.0 mg each day among all the subjects. Correlation and stepwise regression analysis showed that maternal zinc intake was a predictor factor for fetal dimensions and birthweight. The results of this study show that fetal growth and birthweight are directly related to maternal zinc intake among Chinese women, and that there is no relationship between maternal zinc intake during lactation and infant height, weight, or weight gain from birth.