Spencer H, Kramer L, Lesniak M, De Bartolo M, Norris C, Osis D
Clin Orthop Relat Res. 1984 Apr(184):270-80.
Presently submitted and previously available data indicate that the recommended calcium requirement of 800 mg/day is inadequate for a large segment of the population, particularly the elderly. With an intake of 800 mg of calcium/day, calcium balance was only slightly positive, without consideration of dermal losses or other risk factors that may play a role in calcium bioavailability and calcium retention. A calcium intake of 1000-1200 mg/day is preferable, as calcium balance increased significantly when calcium intake was increased from 800 to 1200 mg/day; there was no further improvement in calcium balance on higher calcium intakes, up to 2300 mg/day.
目前提交的数据以及先前可得的数据表明，推荐的每日800毫克钙需求量对于很大一部分人群，尤其是老年人来说是不足的。每日摄入800毫克钙时，钙平衡仅呈微弱正值，未考虑皮肤流失或其他可能影响钙生物利用度和钙潴留的风险因素。每日摄入1000 - 1200毫克钙更为适宜，因为当钙摄入量从800毫克/天增加到1200毫克/天时，钙平衡显著增加；钙摄入量进一步提高至2300毫克/天，钙平衡并未进一步改善。
