If you are losing bone, your doctor may order certain blood and urine lab tests that provide more information. Osteopenia refers to the condition in which some bone has been lost, but probably not enough to be a threat to your bones. It means the bones have started losing mass but so far the risk of breaking is very small. Osteopenia is a warning that bone is being depleted. If you don't stop the bone loss, it will get worse, until actual osteoporosis results.
Proper nutrition is vital.
You must have enough calcium, which builds bones, and vitamin D, which helps absorption of calcium. As we get older, we need more of both of these. Calcium supplements can provide the levels you need, but continue to strive to get as many nutrients as you can from food sources. Calcium supplements are absorbed most efficiently when taken in individual doses of 500 mg or less, which means you need to take supplements more than once a day. Exercise should be part of your daily routine for osteoporosis prevention.