钙是构成人体的重要元素之一,其在人体内的含量仅次于氧、碳、氢、氮,居第五位,约占体重的2％。钙不仅是构成骨骼的重要矿物质,以支持机体,保护重要脏器,而且对维持人体的循环、呼吸、神经、消化、内分泌、肌肉、骨骼、泌尿等系统的正常生理功能具有重要作用。人,从出生到20岁前处于正钙平衡期,骨骼生长旺盛,对钙质的吸收超过排泄。在这20年内,通过血液储藏在骨组织的钙可达1公斤。到了20岁,即进人负钙平衡期,人体对钙质的吸收与排泄,基本平衡。然而,根据最近的文献报告,女性骨 Calcium is one of the most important elements of the human body. Its content in the human body is second only to oxygen, carbon, hydrogen and nitrogen, occupying the fifth place, accounting for about 2% of body weight. Calcium is not only an important mineral constituting the skeleton to support the body and protect important organs, but also plays an important role in maintaining the normal physiological functions of the circulatory, respiratory, nervous, digestive, endocrine, muscular, skeletal and urinary systems of the human body. People, from birth to 20 years ago in a positive calcium balance, strong bone growth, more than the absorption of calcium excretion. During these 20 years, up to 1 kg of calcium can be stored in bone tissue through the bloodstream. To 20 years old, that is, into negative balance of calcium, the body’s absorption and excretion of calcium, the basic balance. However, according to a recent literature report, female bones