It turns out that strengthening bone to avoid fractures starts at a very young age.
Bones become more porous and brittle with age, because the cells responsible for building bone become less active and can no longer keep up with the cells that destroy and remove old bone cells. Physical activity can shift this balance toward maintaining a healthy amount of bone growth,
Physical activity, such as the exercise children get in school gym classes, is important for fighting obesity, but the latest research suggests it may help to keep bones strong as well.
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