BackgroundUntil now, there is no clear overview of how fidelity is assessed in school-based obesity prevention programmes. In order to move the field of obesity prevention programmes forward, the current review aimed to 1) identify which fidelity components have been measured in school-based obesity prevention programmes; 2) identify how fidelity components have been measured; and 3) score the quality of these methods.MethodsStudies published between January 2001–October 2017 were selected from searches in PubMed, EMBASE, PsycINFO, CINAHL, Cochrane Library and ERIC. We included studies examining the fidelity of obesity prevention programmes (nutrition and/or physical activity and/or sitting) at school (children aged 4–18 year) measuring at least one component of implementation fidelity. A data extraction was performed to identify which and how fidelity components were measured. Thereafter, a quality assessment was performed to score the quality of these methods. We scored each fidelity component on 7 quality criteria. Each fidelity component was rated high (> 75% positive), moderate (50–75%) or low (< 50%).ResultsOf the 26,294 retrieved articles, 73 articles reporting on 63 different studies were included in this review. In 17 studies a process evaluation was based on a theoretical framework. In total, 120 fidelity components were measured across studies: dose was measured most often (N = 50), followed by responsiveness (N = 36), adherence (N = 26) and quality of delivery (N = 8). There was substantial variability in how fidelity components were defined as well as how they were measured. Most common methods were observations, logbooks and questionnaires targeting teachers. The quality assessment scores ranged from 0 to 86%; most fidelity components scored low quality (n = 77).ConclusionsThere is no consensus on the operationalisation of concepts and methods used for assessing fidelity in school-based obesity prevention programmes and the quality of methods used is weak. As a result, we call for more consensus on the concepts and clear reporting on the methods employed for measurements of fidelity to increase the quality of fidelity measurements. Moreover, researchers should focus on the relation between fidelity and programme outcomes and determine to what extent adaptations to programmes have been made, whilst still being effective.Electronic supplementary materialThe online version of this article (10.1186/s12966-018-0709-x) contains supplementary material, which is available to authorized users.

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Health promotion efforts should aim to stimulate breakfast consumption, particularly among vocational school students and adolescents of non-Dutch origin. Special attention should be given to breakfast quality. Future research should investigate whether better adherence to the recommendations of the NNC results in enhanced nutrient intake at breakfast.

BackgroundKrachtvoer is a school-based healthy diet programme, developed in 2001 and revised in 2007 to meet the needs of particular segments of the target population as well as a wider target group. The main aims of the present process evaluation of the revised programme were to examine student and teacher appreciation of the programme, completeness of and adherence to its implementation, and relations between appreciation and completeness of implementation.MethodsData were collected among 22 teachers and 1117 students of 13 schools, using student evaluation forms, teacher logbooks, telephone interviews, and classroom observations.ResultsResults indicate favourable levels of teacher and student appreciation for the programme in general and the revised elements. Girls, first-year students and students with more favourable dietary intakes particularly appreciated individual programme elements. Levels of completeness of implementation were high, but several teachers did not adhere to the intended implementation period. Some moderately strong relations were found between teacher appreciation and completeness of implementation scores.ConclusionWe conclude that the revisions have resulted in a programme that was appreciated well, also by the extended target group, and was implemented with a high degree of completeness. Teacher appreciation proved potentially important for completeness of implementation. We identified several aspects requiring improvement, indicating the importance of continued programme updates and repeated evaluation.

Background: Krachtvoer is a Dutch healthy diet programme for prevocational schools, developed in 2001 and revised for a broader target group in 2007, based on the findings of an evaluation of the first version. The goal of this study was to report on the short-and longer-term total and subgroup effects of the revised programme on students' fruit, fruit juice, breakfast, and snack consumption.

To enable improvements in school health promotion, this paper examines associations between the number of health-promotion issues addressed by primary school teachers in the Netherlands and factors thought to influence this behavior. The main factors studied are context characteristics and constructs of attitude, social influence, self-efficacy (SE) and perceived barriers. A total of 180 primary school teachers teaching 9- to 12-year olds (Grades 6, 7 and 8) participated in a cross-sectional survey. The results show that it is possible to differentiate between teachers addressing three or more health issues per year versus those who address fewer based on grade level (more health issues are addressed at higher grades), perceived disadvantages, SE and staff support. The latter seems to exert the greatest influence and may be one of the most promising focus points for improvements of school health promotion in the Netherlands.

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Objective: The goal of the current study was to examine if the completeness of programme implementation and the completeness of implementation of specific programme elements of the Dutch school-based healthy diet promotion programme Krachtvoer are related to short-and longer-term changes in students' fruit, sweets and breakfast intakes. Design: Data on students' dietary intakes were collected 1-4 weeks and 6 months after programme implementation. Teachers filled in a logbook on programme implementation after each lesson. The relationships between changes in students' dietary intakes and completeness of implementation of the programme and of specific programme elements were tested using mixed linear regression analyses. Setting: Thirteen Dutch prevocational schools. Subjects: Eight hundred and seventy-six of the 1117 participating students and eighteen of the twenty-two participating teachers. Results: Completeness of programme implementation was positively related to an increase in fruit consumption in the short term. Completeness of implementation of food exposure activities and a practical lesson on advertisements were related to an increase in fruit consumption in the short as well as the longer term. No such relationships were found for sweets and breakfast consumption. Conclusions: Our results indicate that efforts should be made to help teachers implement the programme as fully as possible.