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Water Consumption during a School Day and Children’s Short-Term Cognitive Performance: The CogniDROP Randomized Intervention Trial

Research Department of Child Nutrition, University Children’s Hospital, Ruhr University Bochum, 44791 Bochum, Germany
Institute for Work, Learning and Ageing (ALA), 44805 Bochum, Germany
Department of Sports Medicine and Sports Nutrition, Ruhr University Bochum, 44801 Bochum, Germany
Author to whom correspondence should be addressed.
Nutrients 2020, 12(5), 1297;
Received: 16 April 2020 / Revised: 28 April 2020 / Accepted: 29 April 2020 / Published: 2 May 2020
There is still little research examining the relationship between water consumption in school and specific cognitive performance. The aim of this cluster-randomized intervention CogniDROP trial was to investigate the short-term effects of drinking water during the morning on executive functions. The participants were from the 5th and 6th grade of a comprehensive school in Germany (14 classes, n = 250, 61.6% boys). The classes were randomly divided into an intervention group (an education on healthy drinking behavior and a promotion of water consumption) and a control group. A battery of computerized tasks (Switch Task, 2-Back Task, Corsi Block-Tapping Task and Flanker Task) was used to test executive functions. Urine color and thirst were evaluated to check the hydration level. Physical activity over the past 24 h was measured using GT3X ActiGraph. A non-linear relationship was observed between the amount of drinking water and executive performance. Consuming water up to 1000 mL (or up to 50% of Total Water Intake) had benefits during memory tasks. Urine color and number of steps on the study day correlated with water consumed. The results suggest that a water-friendly environment supports school-aged children in adequate water intake resulting in better cognitive performance, especially short-term memory. View Full-Text
Keywords: cognition; executive function; hydration; school children cognition; executive function; hydration; school children
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Drozdowska, A.; Falkenstein, M.; Jendrusch, G.; Platen, P.; Luecke, T.; Kersting, M.; Jansen, K. Water Consumption during a School Day and Children’s Short-Term Cognitive Performance: The CogniDROP Randomized Intervention Trial. Nutrients 2020, 12, 1297.

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