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BMC Proceedings

Volume 6 Supplement 3

Metabolism, diet and disease

Open Access

Blood levels of the micronutrient zinc decrease with advancing age in normally nourished elderly persons

  • Michiyo Takahashi1,
  • Ayumi Takagi2,
  • Toshikazu Suzuki1, 2 and
  • Hikaru Matsumoto1, 2
BMC Proceedings20126(Suppl 3):P48

https://doi.org/10.1186/1753-6561-6-S3-P48

Published: 1 June 2012

Background

The prevalence of malnutrition in elderly populations has emerged as a social issue. Malnutrition can cause significant deterioration of health, impede individuals’ independence and quality of life, and increase morbidity and mortality rates. Early detection and prompt treatment are very important in preventing malnutrition. The Mini Nutritional Assessment (MNA®) is now widely used for nutrition screening and as an assessment tool for elderly persons aged over 65 years. In this study, we investigated which blood nutrients were liable to decrease with advancing age in healthy elderly persons who were classified as normally nourished.

Materials and methods

The participants comprised 13 elderly adults (7 men and 6 women, mean age 82.5±5.2 years), belonging to a senior citizens’ club in Ichikawa City, Japan. An individual’s physical composition was analyzed using anthropometric parameters. The Nutrition status Mini Nutritional Assessment comprising 18 questions (the full MNA®) and a brief-type self-administered diet history questionnaire (BDHQ) were used to evaluate the nutritional status and dietary intake of subjects, respectively. The levels of various nutrients in the blood were determined by laboratory biochemical blood tests. Measurements were performed in December 2011 and the data were compared with data obtained from the same participants two and half years ago (March 2009) [1].

Results

The average screening score of the full MNA® from March 2009 and December 2011 was 26.7 ± 1.3 and 27.5 ± 1.3, respectively. The estimated nutrient intake measured by BDHQ analysis revealed all participants were well nourished. The Body Mass Index score from December 2011 (23.0 ± 1.8) was slightly but significantly lower (p<0.01) than that from March 2009 (23.5 ± 2.0). Although the concentration of red blood cells, hematocrit, hemoglobin content, and serum levels of total protein, albumin, and iron were not significantly different compared with the original measurements (two years and nine months previously), these values appeared to be declining. However, the levels of serum zinc had decreased by 22% during the last 2 years 9 months (p<0.001), although levels were still within the normal range.

Conclusions

The results presented here suggest that elderly people might become susceptible to zinc insufficiency with increasing age, even if they are considered well-nourished. Zinc deficiency causes significant impairment of both the adaptive and innate immune responses, and is important for promoting systemic inflammation [2]. Therefore, it is important for nutritionists to monitor the consumption of micronutrients such as zinc more carefully, in order to maintain and enhance the quality of life in elderly people.

Authors’ Affiliations

(1)
Graduate School of Human Ecology, Wayo Women’s University
(2)
Department of Health and Nutrition, Wayo Women’s University

References

  1. Ito K, Uchida N, Hashizume N, Matsumoto H, Ihara H: Assessment of the nutritional status of elder people who spent self-reliant life and were hospitalized by means of dietary parameters and biochemical blood test. J Jpn Soc Clin Nutr. 2009, Japanese, 30: 167-Google Scholar
  2. Wong CP, Ho E: Zinc and its role in age-related inflammation and immune dysfunction. Mol Nutr Food Res. 2012, 56: 77-87.PubMedView ArticleGoogle Scholar

Copyright

© Takahashi et al; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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