BOSTON -- By 2020, half of all Americans in their 50s or older will have, or be at high risk for, osteoporosis -- thinning of the bones. Osteoporosis is responsible for more than 1.5 million fractures annually. Women are at greatest risk because of the hormonal changes due to menopause, but actual decreases in bone density start as early as one's 30s!

Osteoporosis doesn't have to be part of normal aging. It is treatable, and in some cases, it can be delayed or prevented. Pay attention to the following:

Nutrition -- a diet rich in calcium and vitamin D

Calcium supplements are often needed, as the recommendation is 1,000 milligrams per day under age 50, increasing to 1,200-1,500 after menopause, and 200 units of vitamin D. Also, depending on the diagnosis, bone-building drugs may be prescribed.

Exercise -- weight-bearing activities to improve strength and balance

Because of the increase in gravitational force upon bone, strength-training exercises performed in a standing position are most effective. Examples: Stair-climbing, walking, jogging, squats and lunges.

If you have a family history of osteoporosis, or have had even minor fractures over the age of 50, it may be a good idea to consult with your family physician to find the best course of action for dealing with this serious condition. For more information, click here.