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Purdue study finds dairy better for bones than calcium carbonate
Date:4/28/2009

WEST LAFAYETTE, Ind. - A Purdue University study shows dairy has an advantage over calcium carbonate in promoting bone growth and strength.

Connie Weaver, distinguished professor and head of the food and nutrition department, found that the bones of rats fed nonfat dry milk were longer, wider, more dense and stronger than those of rats fed a diet with calcium carbonate. Calcium carbonate is the most common form of calcium used in calcium-fortified foods and supplements.

Weaver said the study, funded by the National Dairy Council, is the first direct comparison of bone properties between calcium from supplements and milk. It will be published in the August print issue of the Journal of Bone and Mineral Research and is online at http://www.jbmronline.org/

"A lot of companies say, 'If you don't drink milk, then take our calcium pills or calcium-fortified food,'" Weaver said. "There's been no study designed properly to compare bone growth from supplements and milk or dairy to see if it has the same effect."

Data from Purdue's Camp Calcium, a research effort that studies how calcium and other nutrients affect bone growth, show that between the ages of 9 and 18 people require 1,300 milligrams of calcium a day for optimal bone growth. This is the equivalent of about 4 cups of milk or yogurt or the equivalent from cheese or other sources, Weaver said. After the age of 9, due mostly to peer pressure, the gap between the calcium youths need and actually get widens, she said.

The study involved 300 rats that were divided into two groups. For 10 weeks, the rats were given all the nutrients they require, but one group was given dairy and the other was given calcium carbonate as the source of calcium.

After 10 weeks, the bones of 50 rats from each group were measured for strength, density, length and weight.

"We found those measurements were up to 8 percent higher for
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Contact: Greg McClure
gmcclure@purdue.edu
765-496-2296
Purdue University
Source:Eurekalert

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