J Clin Invest. 2019 Jun 24;129(8):3041-3044. doi: 10.1172/JCI130640.
Lactation is a unique period in which the maternal skeleton acts as a storehouse to provide substantial calcium to milk. Women who exclusively breastfeed lose an average of 210 mg of calcium per day, which doubles or triples with twins and triplets. Data from rodent and clinical studies are consistent with skeletal calcium being released to provide much of the calcium needed for milk production. This is programmed to occur independently of dietary calcium intake or intestinal calcium absorption, which remains at the prepregnant rate in breastfeeding women. After weaning, the skeleton is restored to its prior mineralization and strength, but the factors that regulate this remain to be elucidated.
哺乳期是母体骨骼作为钙库向乳汁大量提供钙的独特时期。纯母乳喂养的女性每天平均损失 210 毫克钙,双胎和三胎的损失量增加一倍或三倍。啮齿动物和临床研究的数据表明,骨骼钙被释放以提供大部分产奶所需的钙。这一过程独立于膳食钙摄入或肠道钙吸收而发生,哺乳期妇女的肠道钙吸收仍保持在怀孕前的水平。断奶后,骨骼恢复到先前的矿化和强度,但调节这一过程的因素仍有待阐明。