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Diet for Healthy Bones
By Laird Harrison

How can my diet help me stave off osteoporosis?

The foods you eat can work to keep your bones strong as you age, and some can even help you replace lost bone mass. If you're a woman, you're at particularly high risk for osteoporosis, the brittle-bones disease. After menopause, declining estrogen stores cause women to start losing bone at a rate of 3 percent a year.

Eighty-nine percent of women older than 75 have some degree of serious bone loss, which contributes to 1.5 million fractures annually. Hormone replacement therapy can help, but even if you choose to take estrogen, you can still benefit from the following changes in diet.

Get plenty of calcium!

Your body uses this mineral to build bone, and the typical American woman gets only half the daily amount of calcium she needs. All adults under 50 should be getting 1,000 milligrams a day; after 50, that amount goes up to 1,200 mg.

The easiest way to add more calcium to your diet is to eat more dairy products. Eight ounces of milk, 1.5 ounces of cheddar cheese, 2 cups of cottage cheese, or 1 cup of yogurt provides about 300 mg of calcium, or nearly one-third of the daily requirement.

Fortified orange juice and cereal are also good sources. If you aren't able to get enough calcium from your diet, consider taking a calcium supplement that has 300 mg per tablet.

Get your vitamin D

Your body needs it to shepherd calcium to your bones -- and unless you're elderly, homebound, or religious about using sunscreen, you probably get plenty from sunlight. Ten to fifteen minutes of sunshine three times a week should enable your body to make all the vitamin D it needs.

Just in case, the recommended dietary allowance is that all adults under age 50 get 200 mg a day (those over 50 need 400 mg). To make this easy for you, the government requires that milk be fortified with the nutrient.

Many cereals also contain some vitamin D. If you suspect that you're not getting enough vitamin D from these sources, or if you're over 65, consider taking a multivitamin or a calcium supplement that contains it.

Don't overdo it on the meat

Too much animal protein can interfere with the way your body absorbs calcium. When federal researchers set the daily requirement for this mineral, they assumed that you'd be eating the recommended two servings of animal protein (6 ounces total, or two pieces about the size of a deck of cards) each day.

For every additional serving you eat, it's a good idea to drink an extra glass of milk in order to make sure you're still getting enough calcium.

Cut back on booze

Drinking more than two alcoholic beverages per day can harm bone cells and disrupt their absorption of calcium and vitamin D.

Eat more soy

Foods rich in soy protein may help prevent bone loss and even aid you in building bone after menopause. Although some tofu provides calcium, researchers think that it may be the phytoestrogens, particularly one called genistein, that really protect your bones. These chemicals appear to work somewhat like estrogen, functioning as a sort of natural hormone-replacement therapy.

In one study, postmenopausal women who ate 40 grams of soy protein every day for six months increased bone mass in their spines by 2 percent, while those who didn't eat any continued to lose bone.

One note of caution -- some studies suggest that genistein may stimulate the growth of estrogen-receptive breast cancers and might interfere with the cancer-fighting drug tamoxifen. So if you have had estrogen-receptive tumors, it would be wise to limit soy unless your doctor instructs you otherwise.

You can get more soy into your diet by snacking on roasted soy nuts, tossing some tofu into a vegetable stir-fry, and using soy milk on your cereal or in smoothies.


A former senior editor at WebMD, Laird Harrison is a freelance writer and editor in Oakland, California.

His stories on health issues have appeared in Time, Health, The New Physician, Thrive, BabyCenter, HealthScout, and many other magazines, newspapers, and web sites.

He has also won awards from the Columbia Scholastic Press Association, and has taught journalism at San Francisco State University.


Further Resources

Roberta Larson Duyuff, MS, RD, CFCS, The American Dietetic Association's Complete Food & Nutrition Guide. Chronimed Publishing, 1996, 1998.


References

Potter SM, et al. Soy protein and isoflavones: their effects on blood lipids and bone density in postmenopausal women. Am J Clin Nutr 1998 Dec;68(6 Suppl):1375S-1379S.

Tyler S. Lucas, MD, Thomas A. Einhorn, MD. Osteoporosis: the role of the orthopaedist. J Am Acad Orth Surg 1993;1:48-56.

National Institute of Arthritis and Musculoskeletal and Skin Diseases, Consensus Statement on Optimal Calcium Intake Published in JAMA.

Duffy c, Cyr M. Phytoestrogens: potential benefits and implications for breast cancer survivors. J Womens Health (Larchmt). 2003 Sep;12(7):617-31.

Reviewed by Linda Tsai, M.D., a staff attending physician at Rochester General Hospital (affiliated with University of Rochester School of Medicine), in Rochester, New York.




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