HI agian Ethan! Osteoporosis is a disease of the bones in our bodies. It is when they become weak by losing some of the protiens that hold them together, so they break more easily. It is most common in people over 75, but can affect young people too. It can be caused by things like malnutrition (not eating enough), immobilisation (not moving enough) and as a side effect of some medications. Hope this helps!
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