Abrams S A, Stuff J E
US Department of Agriculture, Children's Nutrition Research Center.
Am J Clin Nutr. 1994 Nov;60(5):739-43. doi: 10.1093/ajcn/60.5.739.
We evaluated the effects of self-selected diets on calcium absorption and calculated retention in girls during pre-, early, and late puberty. Dietary calcium absorption was measured in 51 girls aged 4.9-16.7 y by using a dual-tracer stable-isotope technique. We found that calcium intake was similar among girls of all ages and all degrees of pubertal development and was below the recommended dietary allowance (1200 mg/d) for 21 of 25 girls aged > or = 11 y. The early pubertal period was associated with a higher percent of dietary calcium absorption (34.4 +/- 11.9%) than was the prepubertal (27.7 +/- 8.2%) or late pubertal periods (25.9 +/- 7.8%). Calculated calcium retention averaged 132 +/- 83 mg/d in prepubertal girls, 161 +/- 88 mg/d in early pubertal girls, and 44 +/- 91 mg/d in late pubertal girls. Peak calcium retention during early puberty was far below that previously reported after higher calcium intakes. We conclude that peak periods for calcium retention for girls are in the pre- and early pubertal periods. The current calcium intake of American girls during the pubertal growth period may not enable maximal mineral retention; therefore, increased calcium intakes should be considered.
我们评估了自选饮食对青春期前、青春期早期和晚期女孩钙吸收及钙保留量的影响。采用双示踪稳定同位素技术，对51名年龄在4.9 - 16.7岁的女孩进行了膳食钙吸收量测定。我们发现，所有年龄段及不同青春期发育程度的女孩钙摄入量相似，25名年龄大于或等于11岁的女孩中有21人的钙摄入量低于推荐膳食摄入量（1200毫克/天）。与青春期前（27.7% ± 8.2%）和青春期晚期（25.9% ± 7.8%）相比，青春期早期膳食钙吸收率更高（34.4% ± 11.9%）。青春期前女孩的钙保留量平均为132 ± 83毫克/天，青春期早期女孩为161 ± 88毫克/天，青春期晚期女孩为44 ± 91毫克/天。青春期早期的钙保留峰值远低于先前报道的较高钙摄入量后的峰值。我们得出结论，女孩钙保留的高峰期在青春期前和青春期早期。美国女孩在青春期生长阶段目前的钙摄入量可能无法实现最大矿物质保留；因此，应考虑增加钙摄入量。
