Okay, no long words.
Through your life, you are constantly "remodeling" your bones. <s>Osteoblasts</s> Special cells take away bone, and <s>osteoclasts</s> other special cells lay down more bone. When you are young, these are balanced. If you put load on bones, like if you get a lot of exercise, you get a little more on the rebuilding and your bones get a little stronger. This is why they recommend weight training for people with <s>oteoporosis</s> the weakening bone disease.
When you get older <s>or postmenopausal</s>, there is an imbalance, with more bone being taken up than is being built. The nice drug helps get the bone remodeling into balance. Not having a bone break when you are old is very big for overall quality of life.
<font size = 1>edited to replace all big words with smaller ones</font>



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