介绍： 版权归原作所有，仅供此学习，若有侵权请告知删除。
[12:26.44]The last reading.
[12:28.87]The Importance of Calcium
[12:32.67]Calcium is a mineral that helps build strong bones and teeth and regulates muscle contraction.
[12:42.06]Milk and dairy products have long been held as an important source of calcium.
[12...

介绍： 版权归原作所有，仅供此学习，若有侵权请告知删除。
[12:26.44]The last reading.
[12:28.87]The Importance of Calcium
[12:32.67]Calcium is a mineral that helps build strong bones and teeth and regulates muscle contraction.
[12:42.06]Milk and dairy products have long been held as an important source of calcium.
[12:49.47]In addition to calcium, Vitamin D is important
[12:53.89]because it helps the body absorb and retain calcium in the bones, making them strong.
[13:02.47]Similarly, sufficient exercise is now seen as another vital factor
[13:08.69]in maintaining healthy bone structure and density.
[13:13.30]Concerns have been voiced that a lack of exercise in growing children
[13:18.28]will have a detrimental effect on their bones.
[13:22.57]Calcium can continue strengthening your bones
[13:25.99]until the age of 20 to 25 when peak bone mass is reached.
[13:32.34]After this point, your bones can only maintain or lose their density
[13:38.25]and grow weaker as a natural part of the ageing process.
[13:43.10]Inadequate dietary calcium intake before this age
[13:47.65]can increase the risk of brittle bone disease,
[13:51.44]as calcium is drawn from the bones as a reserve.