Good-quality studies showed that men who are older than age 70 years, have low body weight or weight loss, and are not physically active are at risk for osteoporosis. Other factors that increase a man's risk for osteoporosis are previous fractures without substantial trauma, ongoing use of certain drugs (corticosteroids, such as prednisone, or drugs that are sometimes used to treat prostate cancer), diets low in calcium, cigarette smoking, and spinal cord injury.