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Examining techniques for measuring the effects of nutrients on mental performance and mood state

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journal contribution
posted on 21.01.2016, 15:46 by Mark Hamer, Louise Dye, Ellen S. Mitchell, Sophie Laye, Caroline Saunders, Neil Boyle, Jeroen Schuermans, John Sijben
PURPOSE: Intake of specific nutrients has been linked to mental states and various indices of cognitive performance although the effects are often subtle and difficult to interpret. Measurement of so-called objective variables (e.g. reaction times) is often considered to be the gold standard for assessing outcomes in this field of research. It can, however, be argued that data on subjective experience (e.g. mood) are also important and may enrich existing objective data. The aim of this review is to evaluate methods for measuring mental performance and mood, considering the definition of subjective mood and the validity of measures of subjective experience. METHODS: A multi-stakeholder expert group was invited by ILSI Europe to come to a consensus around the utility of objective and subjective measurement in this field, which forms the basis of the paper. Therefore, the present review reflects a succinct overview of the science but is not intended to be a systematic review. RESULTS: The proposed approach extends the traditional methodology using standard 'objective' measurements to also include the consumers' subjective experiences in relation to food. Specific recommendations include 1) using contemporary methods to capture transient mood states; 2) using sufficiently sensitive measures to capture effects of nutritional intervention; 3) considering the possibility that subjective and objective responses will occur over different time frames; and 4) recognition of the importance of expectancy and placebo effects for subjective measures. CONCLUSIONS: The consensus reached was that the most informative approach should involve collection and consideration of both objective and subjective data.


The expert group received funding from the ILSI Europe Nutrition and Mental Performance Task Force.



  • Sport, Exercise and Health Sciences

Published in

European Journal of Nutrition


HAMER, M. ... et al., 2016. Examining techniques for measuring the effects of nutrients on mental performance and mood state. European Journal of Nutrition, 55(6), pp.1991-2000.


© The Authors. Published by Springer Verlag


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This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

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The final publication is available at Springer via http://dx.doi.org/10.1007/s00394-015-1143-3. This is an Open Access Article. It is published by Springer under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/