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Supplemented zinc does not alter mood in healthy older European adults--a randomised placebo-controlled trial: the
Barbara J Stewart-Knox1, Gordon Rae, Ellen E A Simpson
1Northern Ireland Centre for Food and Health, University of Ulster, Coleraine, BT521SA, Northern Ireland, UK. b.knox@ulster.ac.uk
Objective:
Older people are vulnerable to zinc deficiency, which may impact upon their mood. This randomised, placebo-controlled, double-blind intervention study aimed to investigate the effect of oral zinc gluconate supplementation (15 mg/d; 30 mg/d; and placebo) on subjective mood (affect) in older Europeans.
Subjects:
Healthy volunteers (n 387) aged 55-87 years were recruited.
Setting:
Volunteers in Rome (Italy; n 108) and Grenoble (France; n 91) were aged 70-87 years and those in Coleraine (Northern Ireland; n 93) and Clermont-Ferrand (France; n 95) were aged 55-70 years.
Design:
Mood was measured using the Positive and Negative Affect Scale on four occasions per day over 4 d at baseline, 3 and 6 months post-intervention.
Results:
Mixed ANOVA indicated that neither positive nor negative affect altered in response to zinc (15 mg/d or 30 mg/d) compared to placebo in either the 55-70 years or the ≥70 years age group.
Conclusions:
These results suggest that zinc does not benefit mood in healthy older people.
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