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Adequate Zinc Eases Pneumonia in Elderly
Newswise, August 2010 — A high proportion of nursing facility residents were found to have low serum (blood) zinc concentrations during an observational study funded by the Agricultural Research Service (ARS) and the National Institute on Aging.
The scientists
found that those with normal blood zinc
concentrations were about 50 percent less
likely to develop pneumonia than those with
low concentrations.
The study was
led by Simin Nikbin Meydani, director of the
Nutritional Immunology Laboratory at the
Jean Mayer USDA Human Nutrition Research
Center on Aging (HNRCA) at Tufts University
in Boston, Mass. ARS is the chief intramural
scientific research agency of USDA. HNRCA researchers have been studying immune response and respiratory infections in about 600 elderly residents in 33 nursing facilities in the Boston area. Meydani and colleagues previously reported that among the facility residents, those who consumed 200 international units (IU) of vitamin E daily for one year were 20 percent less likely to get upper respiratory infections, such as colds, than those who took a placebo. The secondary analysis of data from the same clinical trial showed a high proportion of the residents had low serum (blood) zinc concentrations at baseline and after one year of follow-up. All participants had been supplemented with half of the recommended dietary allowance of essential vitamins and minerals, including zinc, during the trial. Those with normal zinc status were not only less likely to develop pneumonia, they also had fewer new prescriptions for antibiotics, a shorter duration of pneumonia, and fewer days of antibiotic use compared with residents who had low zinc levels. In addition, mortality was lower in those with adequate blood zinc levels. The study suggests that supplementation of zinc-deficient elderly may result in reduced risk of pneumonia. Still, the authors note that controlled clinical trials are needed to test efficacy of zinc supplementation as a low-cost intervention to reduce mortality due to pneumonia among vulnerable populations who already have low zinc levels. These study results were published in the American Journal of Clinical Nutrition.
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