Calcium and More

According to Frank, the human body tends to build bone until age 30.

"No one wants to think that at 30 they're 'mid-life,' but that's the way it is for bone," she says.

Healthy intakes of nutrients during childhood and young adulthood maximize bone-building potential, she says. But even in those over 30, high levels of dietary calcium and other nutrients slow the gradual loss of bone that comes with age.

"Bone needs what I like to call a 'matrix of nutrients,' " Frank explains.

Besides calcium, she lists phosphorous, magnesium, and zinc. This is "what I call a 'bone soup,' a kind of matrix that supports bone, allows for the creation of enzymes and different proteins needed to keep that bone healthy," she says.

Calcium remains the most important factor in bone-healthy diets, with current US Department of Agriculture guidelines recommending that children consume the equivalent of 2 cups of milk per day, and adults take in the equivalent of 3 cups daily.

"Foods are better than supplements for calcium," Frank adds, since calcium retains its integrity better in whole foods than in pill form.

Dr. Laura Tosi, an orthopedic surgeon and former chairwoman of the Women's Health Issues Committee at the American Academy of Orthopaedic Surgeons (AAOS), says, "The analogy I like to use is sandcastles."

"If you imagine calcium as being the grains of sand, you've got to build lots of those grains into your castle, or it'll disappear with the first wave," she says. "It's getting that calcium into the bone early on, and keeping it there, that makes it strong."

Then there is vitamin D, which your skin makes naturally whenever it is exposed to UV sunlight.

"Vitamin D is the key that unlocks the door - it lets your body absorb calcium into the bloodstream," Dr. Tosi says. She believes urban, indoor-oriented lifestyles are keeping too many Americans from getting the 15 to 20 minutes of noonday sun that bodies need to build and maintain bone.

Dr. Tosi says, "Vitamin D allows calcium to enter the bloodstream and the body as a whole." He says that without vitamin D a person can drink milk or take a calcium supplement, but these pass through the body.

Especially for individuals living in northern latitudes, Dr. Tosi suggests "going out and doing just a little walk in the sun for 15 to 20 minutes at lunchtime," to boost vitamin D activity.

And she stresses that walking - or any weight-bearing exercise - is also crucial to keeping bones strong.

"Bone is a use-it-or-lose-it substance," Dr. Tosi says. "If you aren't impact-loading - walking, et cetera - bone says 'Oh, I guess I'm not really needed,' and just melts away. So get out there and do a brisk walk for half an hour three or four times a week, or preferably every day. That tells bone to 'stay put.'"

Aging Challenges Bone Health

Both experts agree most younger Americans underestimate their risk for brittle bones in old age.

"They think 'Oh, it's never going to happen to me,' " Dr. Tosi said. But in fact, the Surgeon General's report found that 34 million Americans over 50 are already at high risk for bone fracture.

And bone fractures, even in youth or middle age, are nothing to take lightly, Dr. Tosi notes.

"If you have a fracture as a [young] adult, that's a really bad sign," she says. "Whether or not you have low bone density, it declares that you're someone at risk for having far more fractures than other people, becoming disabled, and losing your freedom as an older adult."

Current data from the AAOS suggest that "fragility fractures" in adults - fractures occurring from falls at standing height or less - are "red flags" that bones are not as strong as they should be, Dr. Tosi remarks.

And fractures in old age can be even more dangerous. According to the AAOS, one out of every four to five elderly women, will die within one year of a hip fracture.

Then there is the toll fragile bones take on overall quality of life.

"People need a walker or cane for the rest of their life," says Dr. Tosi. "They lose their ability to go to the bank, to the grocery store, meet friends for tea. It's tragic. Those are the things that give life meaning."

But brittle bones are preventable, she stresses. Even in middle age, it is not too late to put the brakes on bone loss.

"It's harder, of course, but luckily our bodies are very forgiving, so get on to it now," she says. "Whatever you've got in that sandcastle - hold on to it."

Always consult your physician for more information.

Tips For Bone Health

With proper nutrition, physical activity, and regular check-ups and screenings, Americans can have strong bones and live longer, healthier lives, according to experts at the US Department of Health and Human Services.

Here are some tips to follow: