The best way to start is to establish a healthy pattern of living. This sounds a little vague, like motherhood and apple pie, but there are specific things to do. First, avoid anything that is known to cause an increased rate of bone loss. Second, do things that will increase the amount of bone present.
Exercise really works.
Now they take exercise equipment on the space shuttle to allow them to exercise enough to prevent bone loss. In postmenopausal women, it is necessary to ingest 1500 mg of calcium daily to keep the body in calcium balance. This is the equivalent of six glasses of milk per day. An additional 500 mg of calcium usually is present in a normal diet from dairy products, including milk. These steps will be sufficient for many women to prevent enough bone loss so that they will have a lower risk of bone fractures.