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Contrary to popular belief, bone isn't an inert substance. It's a dynamic tissue
that's always changing. New bone is constantly being added, and
old bone is constantly being dissolved and reabsorbed. Specialized
cells called osteoclasts break down old and weak areas of bone,
and osteoblasts replace it with new, strong bone.
Normally, the processes of bone breakdown and bone rebuilding are balanced.
But problems can arise when internal or environmental factors
speed mineral loss from bone or impede natural bone repair
and rebuilding. These factors include nutritional deficiencies,
inadequate exercise, hormonal and dietary factors, drugs (steroids,
antacids, anticonvulsants and thyroid drugs), and diseases
of the thyroid, kidney, liver or pancreas. Many of these factors
are directly within your control. And even those that are
not can be countered by taking measures to build and maintain
the strength of your bones.
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