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Assessing Calcium Status and Metabolism^1,2,

Department of Foods and Nutrition, Purdue University, West Lafayette, IN 47907

Currently, there is no commonly practiced tool for assessing calcium status of individuals or populations. Few biochemical markers reflect calcium status. Fasting urinary calcium:creatinine ratios may hold promise as an easy, inexpensive method to indicate recent calcium status. Calcium status may best be assessed by integrated measures of calcium assimilation, such as total-body calcium. Although bone-mass measurements do not correlate well with recent dietary intakes of calcium, long-term adequacy of calcium intake influences bone mass. Whether low calcium intakes lead to calcium deficiencies depends on one's ability to adapt and conserve calcium. The relationship between calcium status and a particular disease state, such as osteoporosis, hypertension, or colon cancer, cannot be established until a reliable indicator of calcium status is found.

KEY WORDS: • calcium • calcium status

¹ Presented as part of a conference, "Nutrition Monitoring and Nutrition Status Assessment", at the first fall meeting of the American Institute of Nutrition, Charleston, South Carolina, December 8–10, 1989. The conference was supported in part by cooperative agreement HPU880004-02-1 with the DHHS Office of Disease Prevention and Health Promotion, the USDA Human Nutrition Information Service, the DHHS National Center for Health Statistics, and the International Life Sciences Institute-Nutrition Foundation.

² The Planning Committee for the meeting consisted of Drs. Helen A. Guthrie, Roy J. Martin, Linda D. Meyers, James A. Olson, Catherine E. Woteki, and Richard G. Allison (ex officio). The symposium papers were edited by a committee consisting of Dr. James Allen Olson (coordinator), Dept. of Biochemistry & Biophysics, Iowa State University, Ames, IA; Dr. Cathy C. Campbell, Division of Nutritional Sciences, Cornell University, Ithaca, NY; Dr. Roy J. Martin, Dept. of Foods & Nutrition, University of Georgia, Athens, GA; and Dr. Catherine E. Woteki, Food & Nutrition Board, National Academy of Sciences, Washington, DC.

Manuscript received 10 December 1989. Revision accepted 11 July 1990.