Selenium Concentrations and Mortality Among Community-Dwelling Older Adults: Results from ilSIRENTE Study

Abstract

Background

Selenium has a wide range of pleiotropic effects, influencing redox homeostasis, thyroid hormone metabolism, and protecting from oxidative stress and inflammation. Serum selenium levels are reduced in the older population.

Objectives

to investigate the association of serum selenium levels with all-cause mortality in a sample of community-dwelling older adults.

Design and Setting

Data are from the ‘Invecchiamento e Longevità nel Sirente’ (Aging and Longevity in the Sirente geographic area, ilSIRENTE) study, a prospective cohort study that collected information on individuals aged 80 years and older living in an Italian mountain community (n=347). The main outcome was risk of death after ten years of follow-up.

Participants and measurements

Participants were classified according to the median value of selenium (105.3 μg/L) in two groups: high selenium and low selenium.

Results

A total of 248 deaths occurred during a 10-year follow-up. In the unadjusted model, low levels of selenium was associated with increased mortality (HR, 0.66; 95% CI 0.51-0.85). After adjusting for potential confounders the relationship remained significant (HR, 0.71; 95% CI 0.54-0.92).

Conclusions

Low serum levels of selenium are associated with reduced survival in elderly, independently of age and other clinical and functional variables.

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Correspondence to Silvia Giovannini.

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Giovannini, S., Onder, G., Lattanzio, F. et al. Selenium Concentrations and Mortality Among Community-Dwelling Older Adults: Results from ilSIRENTE Study. J Nutr Health Aging 22, 608–612 (2018). https://doi.org/10.1007/s12603-018-1021-9

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Key words

  • Selenium
  • mortality
  • frail elderly