Calcium and vitamin D intake before bone density test can reduce risk of osteoporosis

Published on May 3, 2011 at 6:04 AM · No Comments

Has a bone density scan placed you at risk for osteoporosis, leading your doctor to prescribe a widely advertised bone-building medication? Not so fast! A University of Illinois study finds that an effective first course of action is increasing dietary calcium and vitamin D or taking calcium and vitamin D supplements.

"For many people, prescription bone-building medicines should be a last resort," said Karen Chapman-Novakofski, a U of I professor of nutrition and co-author of a literature review published in a recent issue of Nutrients.

The study reported that adults who increase their intake of calcium and vitamin D usually increase bone mineral density and reduce the risk for hip fracture significantly. These results were often accomplished through supplements, but food is also a good source of these nutrients, she said.

"I suspect that many doctors reach for their prescription pads because they believe it's unlikely that people will change their diets," she noted.

The scientist said that prescription bone-building medications are expensive, and many have side effects, including ironically an increase in hip fractures and jaw necrosis. They should be used only if diet and supplements don't do the trick.

"Bisphosphonates, for instance, disrupt normal bone remodeling by shutting down the osteoclasts-the cells that break down old bone to make new bone. When that happens, new bone is built on top of old bone. Yes, your bone density is higher, but the bone's not always structurally sound," she said.

A bone density test measures quantity, not quality, of bone. "Although the test reports that you're fine or doing better, you may still be at risk for a fracture," said Chapman-Novakofski.

A woman in midlife can get enough calcium in her diet without gaining weight, said lead author Karen Plawecki, director of the U of I's dietetics program.

"Menopausal women should consume 1,200 milligrams of calcium a day. Three glasses of 1 percent to skim milk will get you up to 900 milligrams. The rest can easily be obtained through calcium-rich and calcium-fortified foods," Plawecki said.

According to Plawecki, the number of foods fortified with calcium and vitamin D is increasing exponentially. Examples are soy milk, orange juice, yogurt, crackers, cereal, bread, breakfast bars, and even pancakes.

The researchers also looked at the effects of dietary protein, vitamin K, soy, and sodium in their literature review. The new USDA food pyramid guidelines recommend that Americans decrease their sodium intake.

"Following a low-sodium diet does seem to have a positive effect on bone density. Some people have the habit of adding a generous sprinkle of salt to most foods before eating, but there's more involved here than learning not to do that. You have to choose different foods," Plawecki said.

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