Can lack of exercise affect my risk of osteoporosis?

For years, a lack of exercise has been known to increase the risk of fractures and osteoporosis. Bones become thinner and weaker without activity, even in young patients who must stay in bed for a long time. Researchers found that patients who wore a cast on their wrist for three weeks lost about 6% of the bone mass in that area.

Consider this: Because of the lack of weight-bearing exercise on space flights, astronauts can commonly lose 1% of bone mass each month they are in space. Fortunately, this is a risk factor that can be changed.

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