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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Mediterranean style diet is associated with low risk of new-onset diabetes after renal transplantation
Osté, Maryse C.J. ; Corpeleijn, Eva ; Navis, Gerjan J. ; Keyzer, Charlotte A. ; Soedamah-Muthu, Sabita S. ; Berg, Else Van Den; Postmus, Douwe ; Borst, Martin H. De; Kromhout, Daan ; Bakker, Stephan J.L. - \ 2017
BMJ Open Diabetes Research and Care 5 (2017)1. - ISSN 2052-4897
Objective: The incidence of new-onset diabetes after transplantation (NODAT) and premature mortality is high in renal transplant recipients (RTR). We hypothesized that a Mediterranean Style diet protects against NODAT and premature mortality in RTR. Research design and methods: A prospective cohort study of adult RTR with a functioning graft for >1 year. Dietary intake was assessed with a 177- item validated food frequency questionnaire. Patients were divided based on a 9-point Mediterranean Style Diet Score (MDS): low MDS (0-4 points) versus high MDS (5-9 points). A total of 468 RTR were eligible for analyses. Logistic multivariable regression analyses were used to study the association of MDS with NODAT and Cox multivariable regression models for the association with all-cause mortality. Results: Mean±SD age was 51.3±13.2 years and 56.6% were men. About 50% of the patients had a high MDS. During median follow-up of 4.0 (IQR, 0.4-5.4) years, 22 (5%) RTR developed NODAT and 50 (11%) died. High MDS was significantly associated with both a lower risk of NODAT (HR=0.23; 95% CI 0.09 to 0.64; p=0.004) and allcause mortality (HR=0.51; 95% CI 0.29 to 0.89, p=0.02) compared to low MDS, independent of age and sex. Adjustment for other potential confounders, including total energy intake, physical activity and smoking status, did not materially change the results of the analyses. Conclusions: Dietary habits leading to high MDS were associated with lower risk of NODAT. These results suggest that healthy dietary habits are of paramount importance for RTR.
Prevalence and effects of functional vitamin K insufficiency : The PREVEND study
Riphagen, Ineke J. ; Keyzer, Charlotte A. ; Drummen, Nadja E.A. ; Borst, Martin H. de; Beulens, Joline W.J. ; Gansevoort, Ron T. ; Geleijnse, Johanna M. ; Muskiet, Frits A.J. ; Navis, Gerjan ; Visser, Sipke T. ; Vermeer, Cees ; Kema, Ido P. ; Bakker, Stephan J.L. - \ 2017
Nutrients 9 (2017)12. - ISSN 2072-6643
All-cause mortality - Cardiovascular mortality - Matrix Gla protein - Vitamin K
Matrix Gla Protein (MGP) is a strong vitamin K-dependent inhibitor of soft tissue calcification. We assessed the prevalence of functional vitamin K insufficiency, as derived from plasma desphospho-uncarboxylated MGP (dp-ucMGP), and investigated whether plasma dp-ucMGP is associated with all-cause and cardiovascular mortality in a large general population-based cohort. We included 4275 subjects (aged 53 ± 12 years, 46.0% male) participating in the prospective general population-based Prevention of Renal and Vascular End-Stage Disease (PREVEND) study. The prevalence of functional vitamin K insufficiency (i.e., dp-ucMGP > 500 pmol/L) was 31% in the total study population. This prevalence was significantly higher among elderly and subjects with comorbidities like hypertension, type 2 diabetes, chronic kidney disease, and cardiovascular disease (~50%). After 10 years of follow-up, 279 subjects had died, with 74 deaths attributable to cardiovascular causes. We found significant J-shaped associations of plasma dp-ucMGP with all-cause (linear term: hazard ratio (HR) (95% confidence interval (CI)) = 0.20 (0.12–0.33), p < 0.001; squared term: 1.14 (1.10–1.17), p < 0.001) and cardiovascular mortality (linear term: 0.12 (0.05–0.27), p < 0.001; squared term: 1.17 (1.11–1.23), p < 0.001). These associations remained significant after adjustment for potential confounders. Whether the correction of vitamin K insufficiency improves health outcomes needs to be addressed in future prospective intervention studies.
Mediterranean Type Diet is Associated with Low Risk of New-Onset Diabetes and Mortality after Renal Transplantation
Osté, M. ; Corpeleijn, E. ; Navis, G. ; Keyzer, C.A. ; Soedamah-Muthu, S.S. ; Berg, Else van den; Kromhout, D. ; Bakker, Stephan L.J. - \ 2015
Clinical Journal of the American Society of Nephrology 26 (2015). - ISSN 1555-9041 - p. 624A - 624A.
Background: The incidence of new-onset diabetes after transplantation (NODAT) and cardiovascular events leading to premature mortality is high in renal transplant recipients (RTR). We hypothesized that a Mediterranean type diet protects against development of NODAT and premature mortality in RTR. Methods: In a prospective cohort study consisting of 707 adult stable RTR with a functioning graft for > 1 year, dietary intake at baseline was assessed with a 177 item validated food frequency questionnaire. Patients were divided into two categories, low resemblance (0-4 points) and high resemblance (5-9 points), based on a 9-point score according to the degree that their dietary pattern resembles that of a Mediterranean type diet. RTR with missing dietary data, diabetes mellitus at baseline or who underwent combined pancreas-kidney transplantation were excluded from analyses, leaving 474 RTR. Cox multivariable regression analyses were used to study the association of the Mediterranean diet with the development of NODAT and mortality. Results: In total 474 RTR (56,8% men) were included with a mean ± SD age of 51.5 ± 13.2 years. At baseline, 256 (54%) had a high resemblance to that of a Mediterranean type diet. During median follow-up of 3.8 (interquartile range [IQR], 3.0-4.6) years from baseline, 28 (6%) developed NODAT and 52 (11%) patients died. RTR with ≥ 5 points were both significantly associated with a lower risk of developing NODAT (hazard ratio [HR], 0.43; 95% confidence interval [CI], 0.20-0.94; P=0.04) and mortality (HR, 0.54; 95% CI, 0.31-0.95, P=0.03), both adjusted for age and sex. The results of multivariable analyses, in which we adjusted for potential confounders including total energy intake, physical activity and smoking status, did not materially change the results of the analyses adjusted for age and sex. Conclusions: Dietary habits that resemble the Mediterranean type diet may protect against NODAT and mortality after kidney transplantation. More attention should be directed to the nutritional habits of renal transplant recipients.
Reporting accuracy of population dietary sodium intake using duplicate 24 h dietary recalls and a salt questionnaire
Keyzer, W. de; Dofkova, M. ; Lillegaard, I.T.L. ; Maeyer, M. de; Frost Andersen, L. ; Ruprich, J. ; Rehurkova, I. ; Geelen, Anouk ; Veer, P. van 't; Henauw, S. de; Crispim, S.P. ; Boer, Evelien de; Ocke, M.C. ; Slimani, N. ; Huybrechts, I. - \ 2015
The British journal of nutrition 113 (2015). - ISSN 0007-1145 - p. 488 - 497.
Diet surveys - Self-reports - Biological markers/urine - Dietary sodium - European Food Consumption Validation
High dietary Na intake is associated with multiple health risks, making accurate assessment of population dietary Na intake critical. In the
present study, reporting accuracy of dietary Na intake was evaluated by 24 h urinary Na excretion using the EPIC-Soft 24 h dietary recall
(24-HDR). Participants from a subsample of the European Food Consumption Validation study (n 365; countries: Belgium, Norway and
Czech Republic), aged 45–65 years, completed two 24 h urine collections and two 24-HDR. Reporting accuracy was calculated as the
ratio of reported Na intake to that estimated from the urinary biomarker. A questionnaire on salt use was completed in order to assess
the discretionary use of table and cooking salt. The reporting accuracy of dietary Na intake was assessed using two scenarios: (1) a salt
adjustment procedure using data from the salt questionnaire; (2) without salt adjustment. Overall, reporting accuracy improved when
data from the salt questionnaire were included. The mean reporting accuracy was 0·67 (95% CI 0·62, 0·72), 0·73 (95% CI 0·68, 0·79)
and 0·79 (95% CI 0·74, 0·85) for Belgium, Norway and Czech Republic, respectively. Reporting accuracy decreased with increasing BMI among male subjects in all the three countries. For women from Belgium and Norway, reporting accuracy was highest among those classified as obese (BMI $30 kg/m2: 0·73, 95% CI 0·67, 0·81 and 0·81, 95% CI 0·77, 0·86, respectively). The findings from the present study showed considerable underestimation of dietary Na intake assessed using two 24-HDR. The questionnaire-based salt adjustment procedure improved reporting accuracy by 7–13%. Further development of both the questionnaire and EPIC-Soft databases (e.g. inclusion of a facet to describe salt content) is necessary to estimate population dietary Na intakes accurately.
Cross-Continental Comparison of National Food Consumption Survey Methods—A Narrative Review
Keyzer, W. de; Bracke, T. ; McNaughton, S.A. ; Parnell, W. ; Moshfegh, A.J. ; Pereira, R.A. ; Lee, H.S. ; Veer, P. van 't; Henauw, S. de; Huybrechts, I. - \ 2015
Nutrients 7 (2015)5. - ISSN 2072-6643 - p. 3587 - 3620.
Food consumption surveys are performed in many countries. Comparison of results from those surveys across nations is difficult because of differences in methodological approaches. While consensus about the preferred methodology associated with national food consumption surveys is increasing, no inventory of methodological aspects across continents is available. The aims of the present review are (1) to develop a framework of key methodological elements related to national food consumption surveys, (2) to create an inventory of these properties of surveys performed in the continents North-America, South-America, Asia and Australasia, and (3) to discuss and compare these methodological properties cross-continentally. A literature search was performed using a fixed set of search terms in different databases. The inventory was completed with all accessible information from all retrieved publications and corresponding authors were requested to provide additional information where missing. Surveys from ten individual countries, originating from four continents are listed in the inventory. The results are presented according to six major aspects of food consumption surveys. The most common dietary intake assessment method used in food consumption surveys worldwide is the 24-HDR (24 h dietary recall), occasionally administered repeatedly, mostly using interview software. Only three countries have incorporated their national food consumption surveys into continuous national health and nutrition examination surveys.
Capacity strengthening in food policy research: what works?
Kuyvenhoven, A. - \ 2014
In: Real and Integer. Thirty Essays on Economics, Development and Michiel Keyzer / Merbis, M., van Wesenbeeck, L., Amsterdam : VU Amsterdam, SOW - p. 71 - 76.
Erratum to: Bias in protein and potassium intake collected with 24-h recalls (EPIC-Soft) is rather comparable across European populations
Crispim, Sandra P. ; Geelen, Anouk ; Vries, Jeanne H.M. De; Freisling, Heinz ; Souverein, Olga W. ; Hulshof, Paul J.M. ; Ocke, Marga C. ; Boshuizen, Hendriek ; Andersen, Lene F. ; Ruprich, Jiri ; Keyzer, Willem De; Huybrechts, Inge ; Lafay, Lionel ; Magistris, Maria S. De; Ricceri, Fulvio ; Tumino, Rosario ; Krogh, Vittorio ; Bueno-De-Mesquita, H.B. ; Beulens, Joline W.J. ; Boutron-Ruault, Marie Christine ; Naska, Androniki ; Crowe, Francesca L. ; Boeing, Heiner ; McTaggart, Alison ; Kaaks, Rudolf ; Veer, Pieter van 't; Slimani, Nadia - \ 2013
European Journal of Nutrition 52 (2013)2. - ISSN 1436-6207 - p. 857 - 858.
Validation of the Diet Quality Index for Adolescents by comparison with biomarkers, nutrient and food intakes: the HELENA study
Vyncke, K. ; Cruz Fernandez, E. ; Fajo-Pascual, M. ; Cuenca-Garcia, M. ; Keyzer, W. de; Gonzalez-Gross, M. ; Moreno, L.A. ; Beghin, L. ; Geelen, A. - \ 2013
The British journal of nutrition 109 (2013). - ISSN 0007-1145 - p. 2067 - 2078.
healthy eating index - fatty-acid-composition - life-style - european adolescents - adipose-tissue - great fat - vitamin-d - nutrition - plasma - blood
Food-based dietary guidelines (FBDG) aim to address the nutritional requirements at population level in order to prevent diseases and promote a healthy lifestyle. Diet quality indices can be used to assess the compliance with these FBDG. The present study aimed to investigate whether the newly developed Diet Quality Index for Adolescents (DQI-A) is a good surrogate measure for adherence to FBDG, and whether adherence to these FBDG effectively leads to better nutrient intakes and nutritional biomarkers in adolescents. Participants included 1804 European adolescents who were recruited in the Healthy Lifestyle in Europe by Nutrition in Adolescence (HELENA) Study. Dietary intake was assessed by two, non-consecutive 24 h recalls. A DQI-A score, considering the components' dietary quality, diversity and equilibrium, was calculated. Associations between the DQI-A and food and nutrient intakes and blood concentration biomarkers were investigated using multilevel regression analysis corrected for centre, age and sex. DQI-A scores were associated with food intake in the expected direction: positive associations with nutrient-dense food items, such as fruits and vegetables, and inverse associations with energy-dense and low-nutritious foods. On the nutrient level, the DQI-A was positively related to the intake of water, fibre and most minerals and vitamins. No association was found between the DQI-A and total fat intake. Furthermore, a positive association was observed with 25-hydroxyvitamin D, holo-transcobalamin and n-3 fatty acid serum levels. The present study has shown good validity of the DQI-A by confirming the expected associations with food and nutrient intakes and some biomarkers in blood
Predicting urinary creatinine excretion and its usefulness to identify incomplete 24h urine collections
Keyzer, W. de; Huybrechts, I. ; Dekkers, A.L.M. ; Geelen, A. ; Crispim, S.P. ; Hulshof, P.J.M. ; Andersen, L.F. ; Rehurkova, I. ; Ruprich, J. ; Volatier, J.L. ; Maele, G. van; Slimani, N. ; Veer, P. van 't; Boer, E. de; Henauw, S. de - \ 2012
The British journal of nutrition 108 (2012)6. - ISSN 0007-1145 - p. 1118 - 1125.
4-aminobenzoic acid - european centers - completeness - potassium - diet - validation - stability - recalls - protein - sodium
Studies using 24 h urine collections need to incorporate ways to validate the completeness of the urine samples. Models to predict urinary creatinine excretion (UCE) have been developed for this purpose; however, information on their usefulness to identify incomplete urine collections is limited. We aimed to develop a model for predicting UCE and to assess the performance of a creatinine index using para-aminobenzoic acid (PABA) as a reference. Data were taken from the European Food Consumption Validation study comprising two non-consecutive 24 h urine collections from 600 subjects in five European countries. Data from one collection were used to build a multiple linear regression model to predict UCE, and data from the other collection were used for performance testing of a creatinine index-based strategy to identify incomplete collections. Multiple linear regression (n 458) of UCE showed a significant positive association for body weight (ß = 0·07), the interaction term sex × weight (ß = 0·09, reference women) and protein intake (ß = 0·02). A significant negative association was found for age (ß = - 0·09) and sex (ß = - 3·14, reference women). An index of observed-to-predicted creatinine resulted in a sensitivity to identify incomplete collections of 0·06 (95 % CI 0·01, 0·20) and 0·11 (95 % CI 0·03, 0·22) in men and women, respectively. Specificity was 0·97 (95 % CI 0·97, 0·98) in men and 0·98 (95 % CI 0·98, 0·99) in women. The present study shows that UCE can be predicted from weight, age and sex. However, the results revealed that a creatinine index based on these predictions is not sufficiently sensitive to exclude incomplete 24 h urine collections.
Biomarker-based evaluation of two 24-h recalls for comparing usual fish, fruit and vegetable intakes across European centers in the EFCOVAL Study
Vries, J.H.M. de; Crispim, S.P. ; Souverein, O.W. ; Hulshof, P.J.M. ; Ruprich, J. ; Dofkova, M. ; Huybrechts, I. ; Keyzer, W. de; Lillegaard, I.T.L. ; Lafay, L. ; Rousseau, A.S. ; Ocke, M.C. ; Slimani, N. ; Veer, P. van 't - \ 2011
European Journal of Clinical Nutrition 65 (2011). - ISSN 0954-3007 - p. S38 - S47.
serum cholesteryl esters - life-style factors - n-3 fatty-acids - food-consumption - plasma carotenoids - alcohol-consumption - level correlations - adipose-tissue - lipid classes - dietary
Background/Objectives: A standardized methodology is important to enable consistent monitoring of dietary intake across European countries. For this reason, we evaluated the comparability of the assessment of usual food intake collected with two non-consecutive computerized 24-h dietary recalls (24-HDRs) and a food propensity questionnaire (FPQ) among five European centers. Subjects/Methods: Two 24-HDRs using EPIC-Soft (the software developed to conduct 24-HDRs in the European Prospective Investigation into Cancer and Nutrition (EPIC) Study) were performed to determine fish, fruit and vegetable (FV) consumed by 600 adults in Belgium (BE), the Czech Republic (CZ), France (FR), the Netherlands (NL) and Norway (NO) in a validation study. An FPQ was used to identify non-consumers. Information from the 24-HDRs and FPQ were used to estimate individual usual food intake by the Multiple Source Method (MSM). Blood samples were drawn to determine fatty acids in phospholipids and serum carotenoids as biomarkers of fish, and FV intake, respectively. Results: The pooled correlation between usual fish intake and eicosapentaenoic acid plus docosahexaenoic acid in phospholipids was 0.19 in men and 0.31 in women (P for heterogeneity >0.50) and center-specific correlations ranged between 0.08 (CZ) and 0.28 (BE and NO) in men, and between 0.19 (BE) and 0.55 (FR) in women. For usual FV intake, the pooled correlation with serum carotenoids was 0.31 in men and 0.40 in women (P for heterogeneity >0.10); the center-specific correlations varied between 0.07 (NO) and 0.52 (FR) in men, and between 0.25 (NL) and 0.45 (NO) in women. Conclusion: Two standardized 24-HDRs using EPIC-Soft and an FPQ appeared to be appropriate to rank individuals according to their fish and FV intake in a comparable way among five European centers.
Respondents' evaluation of the 24-h dietary recall method (EPIC-Soft) in the EFCOVAL Project
Huybrechts, I. ; Geelen, A. ; Vries, J.H.M. de; Casagrande, C. ; Nicolas, G. ; Keyzer, W. de; Lillegaard, I.T.L. ; Ruprich, J. ; Lafay, L. ; Wilson-van den Hooven, E.C. ; Niekerk, E.M. ; Margaritis, I. ; Rehurkova, I. ; Crispim, S.P. ; Freisling, H. ; Henauw, S. de; Slimani, N. - \ 2011
European Journal of Clinical Nutrition 65 (2011). - ISSN 0954-3007 - p. S29 - S37.
multiple-pass method - validation - children - accuracy - centers
Background: To improve participation rate, accuracy and respondents’ compliance, it is important to know the respondents’ viewpoint. Objective: To evaluate respondents’ preferences and perception about the EPIC-Soft (the software developed to conduct 24-h dietary recalls (24-HDRs) in the European Prospective Investigation into Cancer and Nutrition (EPIC) Study) 24-HDR interviews and to compare these preferences and perception between population groups (for example, between genders). Design: Data were collected in Belgium, Czech Republic, France, the Netherlands and Norway in 2007. Two 24-HDRs (face-to-face and telephone administered) were conducted using EPIC-Soft. An evaluation questionnaire on different study aspects was completed by the respondents. Setting: Data were collected in the European Food Consumption Validation Study. Subjects: A convenience sample of 600 apparently healthy men and women, 45–65 years old and including all educational levels, were recruited (120 subjects per country). Differences among population groups were compared by means of the ¿ 2-test. Results: A total of 585 respondents completed the evaluation questionnaire. In all, 88% experienced problems only to a low degree when answering face-to-face and telephone-administered 24-HDR using EPIC-Soft. A total of 15% would have preferred help of another person during the face-to-face interview in the study center (mainly men: P
Inventory of experiences from national/regional dietary monitoring surveys using EPIC-Soft
Huybrechts, I. ; Casagrande, C. ; Nicolas, G. ; Geelen, A. ; Crispim, S.P. ; Keyzer, W. de; Freisling, H. ; Henauw, S. de; Maeyer, M. de; Krems, C. ; Amiano, P. ; Boer, E.J. de; Ocke, M.C. ; Vries, J.H.M. de; Slimani, N. - \ 2011
European Journal of Clinical Nutrition 65 (2011). - ISSN 0954-3007 - p. S16 - S28.
recall - calibration - program - cancer
Background/Objectives: The EPIC-Soft 24-h recall (the software developed to conduct 24-h dietary recalls (24-HDRs) in the European Prospective Investigation into Cancer and Nutrition (EPIC) Study) has been used in several regional/national dietary monitoring surveys. The main objective of the study was to present and discuss design, settings, logistics, data management and quality controls of dietary monitoring surveys that used EPIC-Soft for the collection of food consumption data. Subjects/Methods: Within European Food Consumption Validation (EFCOVAL), a questionnaire including questions on current/past EPIC-Soft experiences and requirements for the future was developed and sent to all institutes that used EPIC-Soft in their food consumption survey(s) (five surveys in four different countries). Results: EPIC-Soft was used in the national food consumption survey in Belgium (greater than or equal to15–97 years), Germany (14–80 years), the Netherlands (19–30 years and 2–6 years) and Spain (regional only; 4–18 years). Participation rates in these surveys were 46% (Belgium), 42% (Germany), 42% (Dutch survey in adults), 79% (Dutch survey in children) and 77% (Basque survey). Two 24-HDRs were collected by conducting face-to-face interviews in Belgium and Spain, and through telephone interviews in Germany and the Netherlands. Except the Netherlands (19–30 years), where the study was conducted only in autumn, in all other countries the study was conducted throughout the four seasons, including all days of the week. Interviews were conducted by dietitians, except in Germany and Spain. Mean EPIC-Soft interview time was 20–34¿min. The dropout rate between the first and second interviews was low (
Potential and requirements for a standarized pan-European food consumption survey using the EPIC-Soft software
Ocke, M.C. ; Slimani, N. ; Brants, H.A.M. ; Buurma-Rethans, E. ; Casagrande, C. ; Nicolas, G. ; Dofkova, M. ; Donne, C. le; Freisling, H. ; Geelen, A. ; Huybrechts, I. ; Keyzer, W. de; Laan, J.D. van der; Lafay, L. ; Lillegaard, I.T.L. ; Niekerk, E.M. ; Vries, J.H.M. de; Wilson-van den Hooven, E.C. ; Boer, E.J. de - \ 2011
European Journal of Clinical Nutrition 65 (2011). - ISSN 0954-3007 - p. S48 - S57.
24-hour diet recall - plasma carotenoids - level correlations - nutrient intake - nutrition - cancer - recommendations - questionnaires - calibration - validation
Background/Objectives: To describe the strengths, limitations and requirements of using EPIC-Soft software (the software developed to conduct 24-h dietary recalls in the European Prospective Investigation into Cancer and Nutrition (EPIC) Study) in pan-European food consumption surveys, and to discuss potentials and barriers for a harmonized pan-European food consumption survey. Subjects/Methods: The paper is based on the experiences in the ‘European Food Consumption and Validation’ Project, which included updating six existing and preparing one new country-specific EPIC-Soft version, applying EPIC-Soft in validation and feasibility studies, and estimating the intake of nutrients and flavoring substances. The experiences were discussed in the September 2009 workshop ‘Pan-European Food Consumption Surveys—for Standardized and Comparable Transnational Data Collection’. Results: EPIC-Soft is suitable for detailed and standardized food consumption data collection in pan-European food consumption surveys. A thorough preparation of all aspects of the food consumption survey is important for the quality and efficiency during data collection and processing. The preparation and data-handling phase of working with EPIC-Soft is labor intensive and requires trained, motivated and qualified personnel. Conclusions: Given the suitability of EPIC-Soft as standardized dietary assessment tool in European dietary monitoring, the proposed strategy toward a pan-European food consumption survey is to prepare well, to allow flexibility in national extensions and to start with a limited number of countries that are interested
Evaluating quantitative and qualitative models: an application for nationwide water erosion assessment in Ethiopia
Sonneveld, B.G.J.S. ; Keyzer, M.A. ; Stroosnijder, L. - \ 2011
Environmental Modelling & Software 26 (2011)10. - ISSN 1364-8152 - p. 1161 - 1170.
soil loss equation - northern ethiopia - information - highlands - degradation - environment - prediction - scale
This paper tests the candidacy of one qualitative response model and two quantitative models for a nationwide water erosion hazard assessment in Ethiopia. After a descriptive comparison of model characteristics the study conducts a statistical comparison to evaluate the explanatory power of the models, using an Ethiopian soil erosion data set as reference. The study, therefore, introduces a generic transformation procedure, whereby qualitative models reproduce quantitative results, while the outcomes of quantitative models are mapped on an ordered (qualitative) classification. The evaluation yields the following results. Application of the USLE model in Ethiopia is restricted by data paucity, while it ranks lowest in the statistical evaluation. However, it provides reliable results in areas where water erosion incidence is low. The Expert model, based on easily available data and expert judgements, covers a wide variability of the explanatory variables, which makes it suitable for a nationwide assessment. It is the second-best model in the statistical evaluation. Yet, its qualitative output complicates the assessment of the dynamic changes in soil productivity characteristics, while the postulated additive form of the logit model is not appropriate to assess erosion hazard. The quantitative AccDat model has the highest predictive power and is based on easily available data, but has a frail empirical basis and its application at a nationwide scale requires a careful interpretation. The varying performances in the different areas of the data domain justify the selection of a combination of models for a nationwide erosion assessment, rather than a single ‘best’ model.
Food photographs in nutritional surveillance: errors in portion size estimation using drawings of bread and photographs of margarine and beverages consumption
Keyzer, W. de; Huybrechts, I. ; Maeyer, M. de; Ocke, M.C. ; Slimani, N. ; Veer, P. van 't; Henauw, S. de - \ 2011
The British journal of nutrition 105 (2011)7. - ISSN 0007-1145 - p. 1073 - 1083.
atlas - validity
Food photographs are widely used as instruments to estimate portion sizes of consumed foods. Several food atlases are available, all developed to be used in a specific context and for a given study population. Frequently, food photographs are adopted for use in other studies with a different context or another study population. In the present study, errors in portion size estimation of bread, margarine on bread and beverages by two-dimensional models used in the context of a Belgian food consumption survey are investigated. A sample of 111 men and women (age 45–65 years) were invited for breakfast; two test groups were created. One group was asked to estimate portion sizes of consumed foods using photographs 1–2 d after consumption, and a second group was asked the same after 4 d. Also, real-time assessment of portion sizes using photographs was performed. At the group level, large overestimation of margarine, acceptable underestimation of bread and only small estimation errors for beverages were found. Women tended to have smaller estimation errors for bread and margarine compared with men, while the opposite was found for beverages. Surprisingly, no major difference in estimation error was found after 4 d compared with 1–2 d. Individual estimation errors were large for all foods. The results from the present study suggest that the use of food photographs for portion size estimation of bread and beverages is acceptable for use in nutrition surveys. For photographs of margarine on bread, further validation using smaller amounts corresponding to actual consumption is recommended.
Two non-consecutive 24 h recalls using EPIC-Soft software are sufficiently valid for comparing protein and potassium intake between five European centres – results from the European Food Consumption Validation (EFCOVAL) study
Crispim, S.P. ; Vries, J.H.M. de; Geelen, A. ; Souverein, O.W. ; Hulshof, P.J.M. ; Lafay, L. ; Rousseau, A.S. ; Lillegaard, I.T.L. ; Andersen, L.F. ; Huybrechts, I. ; Keyzer, W. de; Ruprich, J. ; Dofkova, M. ; Ocké, M.C. ; Boer, E. de; Slimani, N. ; Veer, P. van 't - \ 2011
The British journal of nutrition 105 (2011)3. - ISSN 0007-1145 - p. 447 - 458.
dietary-survey methodology - 24-hour urinary nitrogen - intake distributions - biochemical markers - composite foods - biomarkers - nutrition - cancer - energy - adults
The use of two non-consecutive 24 h recalls using EPIC-Soft for standardised dietary monitoring in European countries has previously been proposed in the European Food Consumption Survey Method consortium. Whether this methodology is sufficiently valid to assess nutrient intake in a comparable way, among populations with different food patterns in Europe, is the subject of study in the European Food Consumption Validation consortium. The objective of the study was to compare the validity of usual protein and K intake estimated from two non-consecutive standardised 24 h recalls using EPIC-Soft between five selected centres in Europe. A total of 600 adults, aged 45–65 years, were recruited in Belgium, the Czech Republic, France, The Netherlands and Norway. From each participant, two 24 h recalls and two 24 h urines were collected. The mean and distribution of usual protein and K intake, as well as the ranking of intake, were compared with protein and K excretions within and between centres. Underestimation of protein (range 2–13 %) and K (range 4–17 %) intake was seen in all centres, except in the Czech Republic. We found a fair agreement between prevalences estimated based on the intake and excretion data at the lower end of the usual intake distribution ( <10 % difference), but larger differences at other points. Protein and K intake was moderately correlated with excretion within the centres (ranges = 0·39–0·67 and 0·37–0·69, respectively). These were comparable across centres. In conclusion, two standardised 24 h recalls (EPIC-Soft) appear to be sufficiently valid for assessing and comparing the mean and distribution of protein and K intake across five centres in Europe as well as for ranking individuals.
Estimate of total salt intake in two regions of Belgium through analysis of sodium in 24-h urine samples
Vandevijvere, S. ; Keyzer, W. de; Chapelle, J.P. ; Jeanne, D. ; Mouillet, G. ; Huybrechts, I. ; Hulshof, P.J.M. ; Oyen, H. van - \ 2010
European Journal of Clinical Nutrition 64 (2010). - ISSN 0954-3007 - p. 1260 - 1265.
cardiovascular-disease - risk - completeness - creatinine - excretion - diet
Objectives: To evaluate total salt intake in the adult population through an analysis of sodium in 24-h urine samples in two regions of Belgium. Methods: Urine samples were collected over 24¿h from participants and they had to complete a specific questionnaire about salt intake afterwards. Sodium and creatinine concentrations were analysed in these samples. Subjects: The target population comprised adults aged 45–65 years in the region of Ghent and Liege. A total of 123 and 157 volunteers from Ghent and Liege, respectively, were included in the study. Results: The mean creatinine level in Flanders (n=114) amounted to 0.173±0.035¿mmol/kg/day, whereas in the Walloon region (n=135) it amounted to 0.161±0.036¿mmol/kg/day, after the exclusion of subjects with incomplete urine collection. Intake of sodium in Flanders (n=114) was 4.29±1.29¿g/day, whereas in the Walloon region (n=135) it was 3.94±1.44¿g/day. In both regions, sodium intake in men was higher than in women. Conclusion: Salt intake was more or less twice as high as the recommended intake. Salt intake as estimated from 24-h urine collections is substantially higher than that previously calculated on the basis of food consumption data. A salt reduction programme for Belgium is primordial
Photoacoustic and photothermal methods as a tool to aid authenticity tests and quality assessment of foods
Bicanic, D. ; Dóka, O. ; Gibkes, J. ; Offermann, S. ; Dadarlat, D. ; Keyzer, C. ; Long, G. ; Fink, T. ; Gerkema, E. ; Bein, B. ; Boekel, T. van; Jalink, H. - \ 1996
Progress in Natural Science 6 (1996). - ISSN 1002-0071 - p. 573 - 576.
Inhibition of glutathione S-transferase activity in human melanoma cells by _,ß-unsaturated carbonyl derivatives. Effects of acrolein, cinnamaldehyde, citral, crotonadehyde, curcumin, ethacrynic acid, and trans-2-hexenal.
Iersel, M.L.P.S. van; Ploemen, J.P.H.T.M. ; Struik, I. ; Amersfoort, C. van; Keyzer, A.E. ; Schefferlie, J.G. ; Bladeren, P.J. van - \ 1996
Chemico-Biological Interactions 102 (1996). - ISSN 0009-2797 - p. 117 - 132.
Toekomst van het Europees landbouwbeleid; Inleidingen van de studiedag
Keyzer, M.A. ; Stolwijk, H.J.J. ; Veenendaal, P.J.J. - \ 1995
Den Haag : LEI-DLO (Mededeling / Landbouw-Economisch Instituut (LEI-DLO) 544) - ISBN 9789052423098 - 50
overheidsbeleid - landbouwbeleid - agrarisch recht - groene revolutie - economie - landen van de europese unie - gemeenschappelijk landbouwbeleid - Nederland - cap - government policy - agricultural policy - agricultural law - green revolution - economics - european union countries - Netherlands
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