Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Improving dietary intake during lunch through the provision of a healthy school lunch at Dutch primary schools : Design of a pretest-posttest effectiveness study
    Kleef, Ellen Van; Rongen, Frédérique C. ; Vingerhoeds, Monique H. ; Dijkstra, Coosje ; Seidell, Jaap C. - \ 2020
    BMC Public Health 20 (2020)1. - ISSN 1471-2458
    Primary school - School lunch - School-based intervention - Vegetables

    Background: Since there is a shift from eating lunch at home to eating lunch at primary schools in the Netherlands, providing a school lunch may be an important opportunity to improve the diet quality of Dutch children. Therefore, the aim of this Healthy School Lunch project is to encourage healthy eating behavior of children at primary schools by offering a healthy school lunch, based on the guidelines for a healthy diet. In this study, two research questions will be addressed. The first research question is: What and how much do children consume from a self-served school lunch and how do they evaluate the lunch? The second research question is: Do children compensate healthier school lunches by eating less healthy outside school hours? The purpose of this paper is to report the rationale and study design of this study. Methods: In the Healthy School Lunch project children in grades 5-8 (aged 8-12 years) of three primary schools in the Netherlands will receive a healthy school lunch for a 6-month period. To answer research question 1, lunch consumption data will be collected at baseline and again at 3- A nd 6-months. This will be measured with lunch photos and questionnaires among children. To answer the second research question, a quasi-experimental, pre-test post-test intervention-comparison group design (3 intervention schools and 3 comparison schools) will be carried out. Potential compensation effects will be measured with a single brief questionnaire among parents at the three intervention and three comparison schools at month 6 of the lunch period. The school lunch will also be evaluated by parents (discussion groups) and teachers and support staff (brief questionnaires). Discussion: Results of this study will provide valuable information to influence future school lunch interventions and policies. Trial registration: This study is registered at the Netherlands trial register (NTR): Trialregister.nl, Trial NL7402 (NTR7618), registered retrospectively at 2018-11-13.

    Can unhealthy food purchases at checkout counters be discouraged by introducing healthier snacks? A real-life experiment in supermarkets in deprived urban areas in the Netherlands
    Huitink, Marlijn ; Poelman, Maartje P. ; Seidell, Jacob C. ; Pleus, Milan ; Hofkamp, Tom ; Kuin, Carlijn ; Dijkstra, S.C. - \ 2020
    BMC Public Health 20 (2020)1. - ISSN 1471-2458
    Checkout counter - Food environment - Food purchases - Impulsive behavior - Purchase behavior - Snacks - Supermarkets

    Background: The checkout area in supermarkets is an unavoidable point of purchase where impulsive food purchases are likely to be made. However, the product assortment at the checkout counters is predominantly unhealthy. The aim of this real life experiment was to investigate if unhealthy food purchases at checkout counters in supermarkets in deprived urban areas in the Netherlands can be discouraged by the introduction of the Healthy Checkout Counter (HCC). In addition, we examined customers' perceptions towards the HCC. Methods: The HCC was an initiative of a leading supermarket chain in the Netherlands that consisted of displays with a selection of healthier snacks that were placed at the checkouts. We used a real life quasi-experimental design with 15 intervention and 9 control supermarkets. We also performed a cross-sectional customer evaluation in 3 intervention supermarkets using oral surveys to investigate customers' perceptions towards the HCC (n=134). The purchases of unhealthy and healthier snacks at checkouts were measured with sales data. Results: During the intervention period, customers purchased on average 1.7 (SD: 0.08) unhealthy snacks per 100 customers in the intervention supermarket and 1.4 (SD: 0.10) in the control supermarket. Linear regression analyses revealed no statistically significant difference in the change during the control and intervention period of sales of unhealthy snacks between the control and intervention supermarkets (B = - 0.008, 95% CI = - 0.15 to 0.14). The average number of healthier snacks purchased was 0.2 (SD: 0.3) items per 100 customers in the intervention supermarkets during the intervention period. Of the intervention customers, 41% noticed the HCC and 80% of them were satisfied or very satisfied with the intervention. Conclusions: This real life experiment in supermarkets showed that the placement of healthier snacks at checkouts did not lead to the substitution of unhealthy snack purchases with healthier alternatives. Although supermarket customers positively evaluated the HCC, future studies are needed to investigate other strategies to encourage healthier food purchases in supermarkets.

    Social norm nudges in shopping trolleys to promote vegetable purchases : A quasi-experimental study in a supermarket in a deprived urban area in the Netherlands
    Huitink, Marlijn ; Poelman, Maartje P. ; Eynde, Emma van den; Seidell, Jacob C. ; Dijkstra, S.C. - \ 2020
    Appetite 151 (2020). - ISSN 0195-6663
    Deprived urban area - Nudging - Purchase behaviour - Shopping trolleys - Social norm - Supermarkets - Vegetables

    Background: Supermarkets are a key point of purchase for groceries and can therefore have a considerable influence on eating behaviours. Evidence suggests that descriptive social norm nudges in shopping trolleys can be effective in stimulating vegetable purchases in supermarkets. Objective: We investigated the effect of a combination of two nudging strategies in shopping trolleys – a social norm about vegetable purchases and a designated place to put vegetables – on the amount of vegetables purchased in a supermarket in a deprived urban area in the Netherlands. Design: A quasi-experimental study was conducted with two conditions: 1) intervention days on which the shopping trolleys in the supermarket had a green nudge inlay indicating a place for vegetables and a social norm message and 2) control days on which the regular shopping trolleys (no inlay or social norm) were used in the supermarket. During both the intervention and control days, vegetable purchases were measured by means of the cash receipts collected from customers at the checkouts. In addition, individual and purchase characteristics were assessed by means of short surveys. Results: In total, 244 customers participated in the study. Ordinal logistic regression analyses showed that customers on the intervention days (n = 123) were in a higher tertile for grams of vegetables purchased compared to the customers on the control days (OR: 1.66, 95% CI: 1.03–2.69, p = 0.03), especially those who bought groceries for less than three days (OR: 3.24, 95% CI: 1.43–7.35, p = 0.003). Sensitivity analyses also showed that intervention customers who noticed the green inlay were even more likely to purchase more vegetables (OR: 1.86, 95% CI: 1.06–3.25, p = 0.02). Conclusions: This quasi-experimental study showed that a nudge inlay in shopping trolleys communicating a social norm on vegetable purchases and indicating a distinct place to put vegetables in the trolley increased vegetable purchases among supermarket customers.

    The impact of providing a healthy school lunch at Dutch primary schools on dietary intake and appreciation
    Rongen, Frédérique C. ; Vingerhoeds, M.H. ; Dijkstra, C. ; Kleef, E. van; Seidell, Jacob C. - \ 2019
    The impact of providing a healthy school lunch at Dutch primary schools on dietary intake and appreciation
    Rongen, Frédérique ; Vingerhoeds, M.H. ; Dijkstra, S.C. ; Kleef, E. van; Ummels, Meeke ; Seidell, J.C. - \ 2019
    - 1 p.
    Transitioning to a healthy school lunch at primary schools in the Netherlands: which school lunch concepts have most support from children and parents?
    Rongen, Frédérique ; Dijkstra, Coosje ; Kleef, E. van; Seidell, Jacob C. ; Vingerhoeds, M.H. - \ 2019
    The impact of providing a healthy school lunch at Dutch primary schools on dietary intake and appreciation
    Rongen, Frédérique ; Vingerhoeds, M.H. ; Kleef, E. van; Ummels, Meeke ; Dijkstra, Coosje ; Seidell, Jacob C. - \ 2019
    The impact of providing a healthy school lunch at Dutch primary schools on dietary intake and appreciation
    Rongen, Frédérique ; Vingerhoeds, Monique ; Dijkstra, Coosje ; Kleef, Ellen van; Ummels, Meeke ; Seidell, Jacob C. - \ 2019
    De Gezonde schoollunch – voorlopige resultaten
    Vingerhoeds, Monique ; Dijkstra, Coosje ; Kleef, Ellen van; Rongen, Frédérique ; Ummels, Meeke ; Seidell, Jacob C. - \ 2019
    Preferences of Dutch parents for a school lunch program on primary schools and their willingness to pay
    Dijkstra, Coosje ; Rongen, Frédérique ; Vingerhoeds, Monique ; Seidell, Jacob C. ; Kleef, Ellen van - \ 2019
    The impact of providing a healthy school lunch at Dutch primary schools on dietary intake and appreciation
    Rongen, Frédérique ; Vingerhoeds, Monique ; Dijkstra, Coosje ; Kleef, Ellen van; Seidell, Jacob C. - \ 2019
    Vlees is ongezond: hoe kan dat?
    Feskens, Edith ; Seidell, Jaap C. ; Roodenburg, A. ; Kampman, Ellen ; Witkamp, Renger ; Boekel, Tiny van - \ 2019

    Canadese onderzoekers zorgden eind september voor een shock. In het gerenommeerde blad Annals of Internal Medicine noemden zij het eten van rood vlees géén risico voor de volksgezondheid. Net nu we allemaal gewend zijn aan de gedachte dat minder vlees beter voor je is, was dat een tegenintuïtieve bevinding. Dick Veerman vroeg wetenschappers in Nederland en België om een reactie.

    What’s for lunch? The content and quality of lunches consumed by Dutch primary schoolchildren and the differences between lunches consumed at home and at school
    Rongen, Frédérique C. ; Kleef, E. van; Sanjaya, S. ; Vingerhoeds, M.H. ; Buurma-Rethans, E. ; Bogaard, C. van den; Rossum, Caroline van; Seidell, Jacob C. ; Dijkstra, Coosje - \ 2019
    BMC Public Health 19 (2019). - ISSN 1471-2458
    Background: Lunch is an important part of a healthy diet, which is essential for the development, growth and academic performance of school-aged children. Currently there is an increasing number of Dutch primary schoolchildren who are transitioning from eating lunch at home to school. There is limited knowledge about the current quality of the lunches consumed by primary schoolchildren in the Netherlands and whether there are any differences between lunches consumed at home or at school. To investigate differences in content and quality of lunches consumed by Dutch primary schoolchildren at home and at school. Methods: Cross-sectional study among 363 Dutch primary schoolchildren aged 4–12 years based on the first two years of the 2012–2016 Dutch National Food Consumption Survey. Demographic characteristics were obtained through a questionnaire. Diet was assessed with two non-consecutive 24-h dietary recalls. Quality of lunches was assessed on their nutritional quality whether they fitted the nutritional guidelines. ‘Nonparametric tests were used to examine the content and quality of the lunches between place of consumption and parental educational position. Results: The most consumed lunch products among primary schoolchildren were bread, dairy products and sugar-sweetened beverages. Fruit and vegetable consumption was very low. Consumption of milk and other dairy products was higher among children who eat lunch at home than children who eat lunch at school (p < 0.01). Consumption of sugar-sweetened beverages was higher among children who eat lunch at school than children who eat lunch at home (p < 0.01), and at school a higher proportion of the drinks did not fit within the Dutch dietary recommendations (p < 0.01). Conclusions: The current content of the lunches consumed by Dutch primary schoolchildren leaves room for improvement, especially regarding fruit and vegetables. The statistically significantly higher consumption of sugar-sweetened beverages and lower consumption of milk and dairy products at school vs. home is worrisome, as currently more children in the Netherlands are transitioning to having lunch at school.
    What’s for lunch: content and preferences of Dutch primary school children
    Rongen, Frédérique ; Kleef, E. van; Vingerhoeds, M.H. ; Seidell, Jacob C. ; Dijkstra, Coosje - \ 2018
    Een verzorgde lunch op de basisschool: wat kost dat en wat mag dat volgens ouders kosten?
    Dijkstra, S.C. ; Rongen, Frédérique C. ; Kleef, Ellen Van; Seidell, Jaap C. ; Vingerhoeds, Monique H. - \ 2018
    Tijdschrift voor Gezondheidswetenschappen 96 (2018)6. - ISSN 1388-7491 - p. 234 - 237.
    Kinderen in de basisschoolleeftijd eten te weinig groente, fruit en volkorenproducten. Melk en yoghurt worden steeds vaker vervangen door alternatieven met veel suiker [1]. Dit zien we ook terug in de lunchtrommels op
    basisscholen: er zijn grote verschillen in de samenstelling en kwaliteit van broodtrommels tussen kinderen op school en tussen scholen onderling [2–4]. De invoering van het continurooster op steedsmeer basisscholen maakt de introductie van een verzorgde schoollunch mogelijk. Er zijn echter nog veel vragen over een verzorgde schoollunch in Nederland. Een daarvan is: wat
    is de voorkeur van ouders? En daaraan gekoppeld de vragen: wat kost dat en wat zijn ouders bereid ervoor te betalen? Dit artikel geeft een beeld van de voorkeuren van ouders met betrekking tot een verzorgde schoollunch
    en de kosten ervan, en van de betalingsbereidheid van ouders.
    The association of self-regulation with weight loss maintenance after an intensive combined lifestyle intervention for children and adolescents with severe obesity
    Halberstadt, Jutka ; Vet, Emely de; Nederkoorn, Chantal ; Jansen, Anita ; Weelden, Ottelien H. van; Eekhout, Iris ; Heymans, Martijn W. ; Seidell, Jacob C. - \ 2017
    Obesity 4 (2017)1. - ISSN 1930-7381
    Childhood obesity - Inhibition - Reward - Self-regulation - Weight loss maintenance

    Background: Knowledge is limited on the role the ability to self-regulate plays in the long-term outcome of obesity treatment in children and adolescents with severe obesity. The purpose of this study was to determine whether the ability to self-regulate after an one year intensive, partly inpatient, combined lifestyle intervention is associated with weight loss maintenance in children and adolescents with severe obesity. Methods: One hundred twenty participants (8-19 years) with an average SDS-BMI of 3.41 and their parents/caregivers were included in an intervention study. As primary determinant of weight loss maintenance, general self-regulation ability was evaluated using two behavioral computer tasks assessing inhibitory control and sensitivity to reward. Results: There was no association between inhibitory control at T12 and δSDS-BMI between T12 and T24 (ß = 0. 0002; CI 95% = -0.0010-0.0014; P = 0.761). There was also no relation between sensitivity to reward at T12 and δSDS-BMI between T12 and T24 (ß = -0.0028; CI 95% = -0.0075-0.0019; P = 0.244). None of the psychosocial factors that were examined as moderators, showed a statistically significant interaction, except for parental feeding style (P = 0.023). Conclusions: The ability to self-regulate after an intensive, partly inpatient, multidisciplinary one year intervention for severe obesity in children and adolescents was not associated with the ability to maintain the achieved weight loss during the following year. Factors that explain the large range of long term outcomes need to be elucidated.

    An exploration of needs and preferences for dietary support in colorectal cancer survivors : A mixed-methods study
    Hoedjes, Meeke ; Kruif, Anja De; Mols, Floortje ; Bours, Martijn ; Beijer, Sandra ; Winkels, Renate ; Westerman, Marjan J. ; Seidell, Jaap C. ; Kampman, Ellen - \ 2017
    PLoS ONE 12 (2017)12. - ISSN 1932-6203

    Purpose To describe the proportion of colorectal cancer (CRC) survivors who perceive a need for dietary support; to examine which socio-demographic, cancer-related, and health-related characteristics are associated with this need; to explore reasons for (not) needing support; and to explore CRC survivors’ specific needs and preferences with regard to lifestyle (i.e., dietary, exercise, and/or weight management) support. Methods This mixed-methods study comprised a cross-sectional survey among 1774 Dutch CRC survivors and three focus groups (n = 16). To examine associations, logistic regression analyses were conducted. Focus groups were audio-taped, transcribed verbatim, and analyzed using a thematic approach. Results Of 1458 respondents (82%), 1198 (67.5%) were included for analyses. 17.5% reported a need for dietary support. Characteristics associated with this need were: being younger, living without a partner, having a stoma, having diabetes, and being overweight or obese. The main reason for needing support was being unable to initiate and maintain lifestyle changes without support. CRC survivors preferred receiving information soon after diagnosis to make an autonomous, informed decision on improving their lifestyle. They preferred to receive individually-tailored lifestyle support in an autonomy-supportive environment, preferably with involvement of their family and fellow-sufferers. Conclusions This study has provided knowledge on appropriate support for CRC survivors in need for dietary support to improve health outcomes by promoting adherence to lifestyle and body weight recommendations. Findings can be used to better identify CRC survivors in need for dietary support, and to tailor lifestyle support to their needs and preferences in order to promote uptake, adherence, and effectiveness.

    Toward the optimal strategy for sustained weight loss in overweight cancer survivors : a systematic review of the literature
    Hoedjes, Meeke ; Stralen, Maartje M. van; Joe, Sheena Tjon A. ; Rookus, Matti ; Leeuwen, Flora van; Michie, Susan ; Seidell, Jacob C. ; Kampman, Ellen - \ 2017
    Journal of Cancer Survivorship 11 (2017)3. - ISSN 1932-2259 - p. 360 - 385.
    Behaviour change techniques - Cancer survivors - Lifestyle intervention components - Weight loss maintenance
    Purpose: To gain more insight into the optimal strategy to achieve weight loss and weight loss maintenance in overweight and obese cancer survivors after completion of initial treatment, this systematic review aimed to provide an overview of the literature on intervention effects on weight, to describe intervention components used in effective interventions, to identify and synthesize behaviour change techniques (BCTs) and to assess the frequency with which these BCTs were used in effective interventions. Methods: Six databases were searched for original research articles describing weight changes in adult overweight cancer survivors after participation in a lifestyle intervention initiated after completion of initial treatment. Two researchers independently screened the retrieved papers and extracted BCTs using the BCT Taxonomy version 1. Results: Thirty-two papers describing 27 interventions were included. Interventions that were evaluated with a robust study design (n = 8) generally showed
    The association of eating styles with weight change after an intensive combined lifestyle intervention for children and adolescents with severe obesity
    Halberstadt, Jutka ; Strien, Tatjana van; Vet, Emely de; Eekhout, Iris ; Braet, Caroline ; Seidell, Jacob C. - \ 2016
    Appetite 99 (2016). - ISSN 0195-6663 - p. 82 - 90.
    Childhood obesity - Eating behavior - Eating style - Weight change

    The main purpose of this prospective intervention study was to determine whether eating styles after an intensive, partly inpatient, one year combined lifestyle intervention are associated with weight change in the following year in severely obese children and adolescents.A total of 120 participants (8-19 years) with an average SDS-BMI of 3.41 (SD = 0.38) was included. Measurements were conducted at baseline (T0), at the end of treatment (T12) and at the end of follow up two years after baseline (T24). The primary outcome measurement was the δSDS-BMI between T12 and T24. As primary determinant of weight change after treatment, the participants eating styles were evaluated with the Dutch Eating Behavior Questionnaire - child report that measures external, emotional and restraint eating. The association between outcome and determinant was assessed in linear regression analyses. Complete data were available for 76 of the 120 participants.This study shows that for girls a higher score on restraint eating at T12 and a higher score on external eating at T12 were associated with more weight (re)gain in the year after treatment. No statistically significant association with emotional eating at T12 was found. In addition for girls a higher score on external eating at T0 was associated with more weight (re)gain in the year after treatment. Furthermore, the observed changes in eating styles suggest that on average it is possible to influence these with treatment, although the detected changes were different for girls and boys and for the different eating styles.More generally, this study indicates that for girls the levels of restraint and external eating after treatment were associated with the weight change during the following year. Trial registration: : Netherlands Trial Register (NTR1678, registered 20-Feb-2009).

    The 2015 Dutch food-based dietary guidelines
    Kromhout, D. ; Spaaij, C.J.K. ; Goede, J. de; Weggemans, R.M. ; Brug, Johannes ; Geleijnse, Johanna M. ; Goudoever, Johannes B. van; Hoes, Arno W. ; Hopman, Maria T.E. ; Iestra, Jolein A. ; Mensink, Ronald P. ; Pijl, Hanno ; Romijn, Johannes A. ; Schols, Annemie M.W.J. ; Seidell, Jaap C. ; Veer, Pieter van 't; Visser, Marjolein ; Zwietering, Marcel H. - \ 2016
    European Journal of Clinical Nutrition 70 (2016)8. - ISSN 0954-3007 - p. 869 - 878.

    The objective of this study was to derive food-based dietary guidelines for the Dutch population. The dietary guidelines are based on 29 systematic reviews of English language meta-analyses in PubMed summarizing randomized controlled trials and prospective cohort studies on nutrients, foods and food patterns and the risk of 10 major chronic diseases: coronary heart disease, stroke, heart failure, diabetes, breast cancer, colorectal cancer, lung cancer, chronic obstructive pulmonary disease, dementia and depression. The committee also selected three causal risk factors for cardiovascular diseases or diabetes: systolic blood pressure, low-density lipoprotein cholesterol and body weight. Findings were categorized as strong or weak evidence, inconsistent effects, too little evidence or effect unlikely for experimental and observational data separately. Next, the committee selected only findings with a strong level of evidence for deriving the guidelines. Convincing evidence was based on strong evidence from the experimental data either or not in combination with strong evidence from prospective cohort studies. Plausible evidence was based on strong evidence from prospective cohort studies only. A general guideline to eat a more plant food-based dietary pattern and limit consumption of animal-based food and 15 specific guidelines have been formulated. There are 10 new guidelines on legumes, nuts, meat, dairy produce, cereal products, fats and oils, tea, coffee and sugar-containing beverages. Three guidelines on vegetables, fruits, fish and alcoholic beverages have been sharpened, and the 2006 guideline on salt stayed the same. A separate guideline has been formulated on nutrient supplements. Completely food-based dietary guidelines can be derived in a systematic and transparent way.

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