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Osteoporosis has haunted my family for generations, as it has many other families.
My great-grandmother was bent nearly horizontal from collapsed vertebrae. My grandmother lost a foot in height as her spine deteriorated, and broke her hip just pushing a grocery cart. I made her a new backbone out of papier-mache when I was 4.
My mother did everything she could to avoid the family curse, but she also suffered painful collapsed vertebrae. All three women died, directly or indirectly, as a result of osteoporosis.
That was before the bone-building drugs called bisphosphonates became widely available in the mid-1990s. Thanks in part to them, the number of hip fractures has dropped significantly in the U.S. and Canada in recent years.
Osteoporosis remains a serious health problem for the 10 million Americans who have it and the 34 million who are at risk due to low bone mass; 80% of sufferers are women. It's estimated that one half of women and one-quarter of men over age 50 will suffer an osteoporosis-related fracture.
But reports of scary side effects from bisphosphonates -- including Fosamax, Actonel and Boniva -- are circulating on the Internet and in medical journals. Hundreds of lawsuits allege that the drugs cause a rare condition in which part of the jaw bone dies. The first case to be tried against Merck & Co.'s Fosamax ended in a hung jury last week in federal court in New York City. And some critics say the drugs -- with sales of $8.3 billion a year in the U.S. -- are being oversold to women who may never need them.
All that leaves women facing a difficult dilemma: Powerful osteoporosis drugs known to prevent future debilitating injuries are also suspected of increasing the risk for other terrible conditions. Balancing the risks and benefits is different for every woman, and depends on factors such as genetic history, diet and lifestyle. Figuring out how to proceed also requires having a very careful discussion with a qualified physician.
A good place to start is with your family tree. Having a parent with osteoporosis raises your own risk significantly. Caucasians, Asians and Hispanics also have higher rates of osteoporosis than African-Americans. So far, scientists have identified 15 related genes -- but there isn't likely to be a predictive genetic test anytime soon.
That's because environmental factors also play a big role. The more bone you build up during the peak building years before age 30, the more reserves you'll have when net bone loss sets in. For women, that happens very rapidly after menopause when estrogen levels decline. Men lose bone far more slowly, although hormone-deprivation drugs for prostate cancer can also set them up for osteoporosis, as can a very strong hereditary load.
A diet rich in calcium (from dairy products and vegetables), plenty of exposure to vitamin D and weight-bearing exercise all help to build strong bones. Too little of those can weaken them, as can smoking, drinking alcohol, and a taking a variety of medications, including corticosteroids, anticonvulsants and antidepressants. Excessive dieting and exercising and being very thin -- with a body-mass index of less than 20 -- can also leave your bones with little reserve. Being obese actually lowers your risk, though it can overstress your joints.
But some people can do everything right and still develop osteoporosis if they have a strong genetic predisposition.
Some clinics urge women to fight osteoporosis with lifestyle changes rather than pharmaceuticals. Many experts agree that sufficient calcium (at least 1,200 mg per day from food or supplements) and vitamin D (800 to 1,000 IUs per day) and weight-bearing exercise (at least 30 minutes, three times a week) are critical for building and maintaining strong bones, but they may not be sufficient for reversing serious bone loss once it's set in.
All camps agree that the very best way to strong bones is to build them well to begin with. Nearly 90% of bone mass in females is built by age 18, yet few adolescent girls are getting the recommended amounts of calcium and vitamin D. 2009-10-09
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