钙是人体含量最多的矿质元素,是构成骨骼和牙齿的主要成分,参与人体许多生理活动,发挥着极其重要的作用。钙盐的种类很多,而且不同种类的钙盐,其吸收利用也不相同。钙的吸收利用还依据机体对钙的需要、食物种类和钙的摄入量而定。钙在体内的相对保留量根据年龄、膳食习惯和钙的供应水平而不同。在普通膳食中,摄 Calcium is the most abundant mineral element in the human body and constitutes the main component of the bones and teeth. It participates in many physiological activities of the human body and plays an extremely important role. Many types of calcium salts, and different types of calcium salts, their absorption and utilization are not the same. Calcium absorption and utilization is also based on the body’s needs for calcium, food types and calcium intake may be. The relative amount of calcium retained in the body varies according to age, dietary habits and level of calcium supply. In normal diet, photo