Thursday, August 16, 2007

Magnesium intake increases bone mineral density and may reduce the risk of osteoporosis

Image: U.S. Department of Health and Human Services

A study published in the Journal of the American Geriatric Society has shown that dietary intake of magnesium is associated with an increase in bone mineral density in older men and women.

The study included 2,038 men and women aged 70-79 that were enrolled in the Health, Aging and Body Composition Study. Food frequency questionnaires were used to assess magnesium intakes and document any medications. The data also accounted for variations in age, body mass index (BMI), smoking status, alcohol use, physical activity, estrogen use, and supplemental calcium and vitamin D. Higher magnesium intake through diet and supplements was positively associated with total - body bone mineral density (BMD) in older white men and women. For every 100 mg per day increase in magnesium, there was an approximate 2 per cent increase in whole-body BMD.

The results have important implications since osteoporosis currently affects over 10 million adults in the U.S. alone, with another 34 million suspected to have low bone mass. In addition, earlier dietary surveys have consistently shown that a large portion of adults do not meet the RDA for magnesium.

Source: Magnesium Intake from Food and Supplements Is Associated with Bone Mineral Density in Healthy Older White Subjects , Kathryn M. Ryder MD, MS, Ronald I. Shorr MD, MS, Andrew J. Bush PhD, Stephen B. Kritchevsky PhD, Tamara Harris MD, MPH, Katie Stone PhD, Jane Cauley DrPH, Frances A. Tylavsky DrPH (2005), Journal of the American Geriatrics Society November 2005, Vol 53, No 11, pp 1875-1880