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Background and aims: In many countries, the consumption of fruit, berries, and vegetables is about half the recommended. Berries contain bioactive compounds that may affect cognitive functions. School children are often hungry and thirsty during the lectures before lunch and this affects performance. Could a berry-smoothie decrease thirst and hunger, and thereby affect school performance? The aim was to investigate if a cross-over design can be used to study the effects of a smoothie on performance in a school setting. Methods: Methodological challenges included developing an appetizing berry-smoothie and choosing a suitable experimental design that could be adapted to school conditions. In the pilot study, 236 Swedish children aged 10–12 years participated in a cross-over design and were administered either a berry-smoothie or a fruit-based placebo after the midmorning break. Both beverages provided 5% of the daily energy intake. Performance was assessed using the d2 Test of Attention measuring attention span and concentration. Statistical analyses were performed using the Wilcoxon signed rank test in StatXact v 10.3. Results: The consumption of both the smoothie and the placebo increased the attention span and concentration significantly. Conclusion: The children's performance in the d2 Test of Attention was positively affected by beverage consumption. The effect was attributed to the supplementation of water and energy. In this design, the study did not permit any conclusive results regarding the effect of bioactive compounds on performance. In a coming study, a third group, receiving no beverage, should be included aiming to identify the cause of the effect.

Effect on attention of a vegetable smoothie, rich in berries, fruits and vegetables, served at the school mid-morning brake. Viktoria Ohlsson. Kristianstad University Purpose: The purpose of this pilot study was to investigate effect on attention of a vegetable smoothie, rich in berries, fruits and vegetables, served at the mid-morning brake. The smoothie was designed to provide only 5% of the daily energy. The effect was assessed by the D2-test of attention. Participants and setting: Pupils, aged 10 to 12 years, from twelve school classes in southern Sweden, were invited to participate in the study. In total 250 children participated. Children suffering from serious food allergies or food intolerance were excluded from the study. Data collection: The study was designed as a cross-over trial with two study periods of ten schooldays. The children were randomly divided into two groups and were administered either an active smoothie (smoothie 1; group A) or a fruit-based placebo with the same energy content (smoothie 2; group B). After a three week washout period, group A was administered smoothie 2 and group B, smoothie 1. Prior to the study, all children answered a questionnaire about their consumption of fruit, berries and vegetables, physical activity habit and and their perceived hunger during the school day. Age, height and weight was also recorded. Data analysis: Analysis of the data focused on concentration performance as assessed by the D2-test., Projektet "Skolskjutsen – Skånsk smart smoothie för skolbarn" har finansierats av Länsstyrelsen i Skåne inom den Skånska Dryckesstrategin 2013–2020 via Europeiska jordbruksfonden för landsbygdsutveckling., Skolskjutsen