Risk factors you can control

Risk factors you can control
Diet. Getting too little calcium can increase your chances of getting osteoporosis. Not getting enough vitamin D can also increase your risk for the disease. Vitamin D is important because it helps the body use the calcium in your diet.

Physical activity. Not exercising and not being active for long periods of time can increase your chances of getting osteoporosis. Like muscles, bones become stronger – and stay stronger – with regular exercise.

Body weight. Being too thin makes you more likely to get osteoporosis.

Smoking. Smoking cigarettes can keep your body from using the calcium in your diet. Also, women who smoke go through menopause earlier than those who don’t smoke. These things can increase your risk for osteoporosis.

Alcohol. People who drink a lot are more likely to get osteoporosis.

Medicines. Certain medicines can cause bone loss. These include a type of medicine called glucocorticoids (gloo-ko-KOR-ti-koids). Glucocortiocoids are given to people who have arthritis, asthma, and many other diseases. Some other medicines that prevent seizures and that treat endometriosis (en-do-me-tree-O-sis), a disease of the uterus, and cancer can cause bone loss, too.
 
Source   http://www.niams.nih.gov/