钙是构成骨骼和牙齿的重要营养素。食物中钙是否充足,对儿童、青少年的生长发育影响很大。钙在许多食物中都有,我们的饮食习惯和条件,钙的摄取经常来源于蔬菜。冬春季节蔬菜品种少,钙质容易缺乏,因此,要注意充分利用肉骨头、鱼刺中的钙 Calcium is an important nutrient that makes up bones and teeth. The adequacy of calcium in food, children, adolescents, a great influence on the growth and development. Calcium is found in many foods, our diet and conditions, and calcium intake often comes from vegetables. Winter and spring less vegetable varieties, calcium is easy to lack, therefore, we should pay attention to make full use of meat bones, fishbone in the calcium