Being underweight for your height increases your risk of fractures and osteoporosis while being overweight lowers your risk. It is possible that having more fat tissue influences either the production of estrogen by fat cells or the effect of estrogen on the bones. In any event, lean women have the greatest risk of hip fractures, low bone mass, low levels of estrogen, and little fat to cushion their falls.
This is one risk factor that can be changed.
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