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Relationship between self-reported dietary intake and physical activity levels among adolescents: The HELENA study



Evidence suggests possible synergetic effects of multiple lifestyle behaviors on health risks like obesity and other health outcomes. Therefore it is important to investigate associations between dietary and physical activity behavior, the two most important lifestyle behaviors influencing our energy balance and body composition. The objective of the present study is to describe the relationship between energy, nutrient and food intake and the physical activity level among a large group of European adolescents.


The study comprised a total of 2176 adolescents (46.2% male) from ten European cities participating in the HELENA (Healthy Lifestyle in Europe by Nutrition in Adolescence) study. Dietary intake and physical activity were assessed using validated 24-h dietary recalls and self-reported questionnaires respectively. Analyses of covariance (ANCOVA) were used to compare the energy and nutrient intake and the food consumption between groups of adolescents with different physical activity levels (1st to 3rd tertile).


In both sexes no differences were found in energy intake between the levels of physical activity. The most active males showed a higher intake of polysaccharides, protein, water and vitamin C and a lower intake of saccharides compared to less active males. Females with the highest physical activity level consumed more polysaccharides compared to their least active peers. Male and female adolescents with the highest physical activity levels, consumed more fruit and milk products and less cheese compared to the least active adolescents. The most active males showed higher intakes of vegetables and meat, fish, eggs, meat substitutes and vegetarian products compared to the least active ones. The least active males reported the highest consumption of grain products and potatoes. Within the female group, significantly lower intakes of bread and cereal products and spreads were found for those reporting to spend most time in moderate to vigorous physical activity. The consumption of foods from the remaining food groups, did not differ between the physical activity levels in both sexes.


It can be concluded that dietary habits diverge between adolescents with different self-reported physical activity levels. For some food groups a difference in intake could be found, which were reflected in differences in some nutrient intakes. It can also be concluded that physically active adolescents are not always inclined to eat healthier diets than their less active peers.


Physical activity (PA) and dietary habits might have a strong influence on health. These two lifestyle habits are considered as fundamental risk factors for several chronic diseases, such as type 2 diabetes, cardiovascular diseases, obesity, etc. [1, 2]. Also, the increasing prevalence of obesity in youth is considered a result of an imbalance between energy intake and energy expenditure [3]. Furthermore, obesity in young people is accompanied by a high risk to persist into adulthood [4]. This could be partly due to the fact that unhealthy lifestyle behaviours, such as poor diets and a lack of PA, have the tendency of tracking from childhood into adulthood [5, 6]. Previous research using subjective measures of PA [7] has shown that only 12% to 42% of 13 year olds and 8% to 37% of 15 year olds achieved the PA recommendation to participate in moderate to vigorous PA (MVPA) for at least 60 min per day [8]. Furthermore, according to objectively measured data [9], fewer 15 year olds achieved the current activity recommendation compared to 13 year olds, a trend particularly noticeable in girls. It has also been indicated by the HBSC (Health Behaviour in School-aged Children) study [7, 10] that adolescents have poor dietary habits, which are characterized by a high consumption of sweets and soft drinks, breakfast skipping, and a low consumption of fruits and vegetables. Changing those modifiable behaviors into healthy lifestyles, starting from childhood, has the potential to reverse the obesity epidemic and have important short and long term health protective effects. Therefore, the prevention of obesity and the promotion of healthy lifestyle habits in youth are high priorities.

According to Pronk et al. [11], there is also a possible synergetic effect of multiple health behaviors on the risk of chronic conditions and other health outcomes. Therefore, creating a better insight in the relationship between nutrition and PA and the co-occurrence of low physical activity and unhealthy dietary habits among adolescents are important before developing effective promotion and prevention strategies to enhance both health behaviors. Previous studies revealed associations between dietary habits and time spent in PA among adolescents. Kremers et al. [12] showed that a low frequency of fruit consumption clustered with spending little time in PA among Dutch adolescents. Others [13, 14] have indicated that a high percentage of adolescents fail to meet the recommendation for fruit and vegetable intake (5 or more servings per day) [15] together with those for PA. This would mean that healthy dietary and PA behaviors often do not occur in isolation and are correlated with each other. A study by Kelishadi et al. [16] also revealed that the most active adolescents consumed fruit and vegetables and dairy products more frequently compared to their peers spending less time in PA. Furthermore, Coulson et al. [17] reported that a greater consumption of fresh foods was associated with a higher PA participation among English adolescents. On the other hand, inconsistent results were found in adult studies examining the difference in energy and nutrient intake between active and inactive persons [18]. Until now, no studies have examined the relationship between dietary intake, with the attention on both the nutrient and food group level, and self-reported PA levels among adolescents. Therefore, the aim of the present study was to describe the relationship between energy, nutrient and food intake and the PA level among a large group of European adolescents.


Study design

Data was derived from the HELENA-CSS (Healthy Lifestyle in Europe by Nutrition in Adolescence-Cross Sectional Study), which is a multi-centre study on lifestyle and nutrition among adolescents conducted in 10 European cities (Athens in Greece, Dortmund in Germany, Ghent in Belgium, Heraklion in Crete, Lille in France, Pecs in Hungary, Rome in Italy, Stockholm in Sweden, Vienna in Austria, and Zaragoza in Spain) [19]. The main objective was to obtain reliable and comparable data of a sample of European adolescents (12.5 - 17.5 years) on a variety of nutrition and health related parameters, such as PA, via standardized procedures [19]. Data collection took place from 2006 to 2007. A random cluster sampling of 3000 adolescents (based on random selection of classes), stratified for geographical location, age and socioeconomic status, was carried out. A list of 10 schools was provided to each centre and in case of refusal, a second list was already foreseen. A class was seen as eligible if the participation rate was at least 70%. If the participation rate was lower than 70%, the class was replaced by another one in the same age group in the same school. Further details on sampling procedures and study design of the HELENA study have been reported elsewhere [19]. The study was approved by the Ethical Committee of each city involved [20]. A written informed consent was obtained from both the adolescents and their parents for publication of this case report and accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.


HELENA-Dietary Assessment Tool (HELENA-DIAT)

To obtain dietary intake data, the HELENA-DIAT 24-h dietary recall software was used. This 24-h recall assessment tool is based on six meal occasions referring to the day before the interview. The adolescents completed the questionnaire during school time, after dieticians/researchers instructed them on how to fill in this 24-h recall as accurately as possible. The participants were allowed to ask questions and assistance and after completion, the recall was checked for completeness. Every participant was asked to fill in the HELENA-DIAT on arbitrary days, twice in a time-span of 2 weeks. Since the questionnaire was filled in during school time, no data could be collected about the dietary intake on Fridays and Saturdays. A validation study by Vereecken et al. [21] indicated that the YANA-C, a former version of the HELENA-DIAT, showed good agreement with an interviewer-administered YANA-C interview. The HELENA-DIAT tool has been indicated as a good method to collect detailed dietary information from adolescents and was received well by the study participants [22]. Furthermore, a repeated 24-h recall was selected as the most suitable method to get population means and distributions by the European Consumption Survey Method (EFCOSUM) project [23]. To calculate energy and nutrient intake, data of the HELENA-DIAT was linked to the German Food Code and Nutrient Data Base (BLS (Bundeslebensmittelschlüssel), version II.3.1, 2005).

The usual dietary intake of nutrients and foods, also including episodically consumed foods, was estimated by the Multiple Source Method (MSM)[24]. The MSM calculates dietary intake for individuals first and then constructs the population distribution based on the individual data. With this method dietary data was corrected for between and within person variability. After the MSM was applied, dietary data were analyzed for average energy intake in kilocalories (kcal) and energy percentages (En%) from carbohydrates (CH), saccharides (monosaccharides & disaccharides), polysaccharides, proteins, fat, simple unsaturated fatty acids (SUFA), multiple unsaturated fatty acids (MUFA) and saturated fatty acids (SFA). Dietary cholesterol, dietary fiber, water, vitamin C, calcium and iron were also examined after they were adjusted for energy intake, using the nutrient density method (unit per 1000 kcal) [25]. No cases were excluded because of extreme over or underreported energy intake. In addition, daily servings of several food groups (g) were analyzed (see Table 1).

Table 1 Overview of foods included in each food group, according to the HELENA-DIAT (24 h recall)

International Physical Activity Questionnaire for Adolescents (IPAQ-A)

To assess PA of the last 7 days, an adolescent-adapted version of the International Physical Activity Questionnaire (IPAQ) was used, namely the IPAQ-A. The IPAQ is a self-administered questionnaire and originally developed for adults between 15-69 years, assessing the different domains of PA (work, transport, house and garden and leisure time). The questionnaire has been validated as a reliable tool to assess PA in an adult population [26]. To adapt the questionnaire to the HELENA population, questions about PA at work were replaced by questions about PA at school. Furthermore, the item relating domestic and gardening PA was reduced to one question. Also, the order of PA intensities was changed, to avoid over reporting [27]. The time spent at walking was asked before the time spent at vigorous and moderate PA intensity (versus vigorous, moderate and walking in the original IPAQ). As part of a pilot study, a concurrent validation study on this instrument (IPAQ-A), found significant, modest correlations (±0.20) between PA reported in the questionnaire and PA measured with accelerometers [28]. Also a higher correlation in the older adolescents in comparison with the younger ones was revealed [28]. For the IPAQ-A, total minutes per week (min/week) were computed for MVPA, walking not included, based on the guidelines for data processing and analyses of the IPAQ Furthermore, MVPA scores were cleaned and truncated at reasonable and realistic levels based on previous research [29]. PA scores were truncated in the different domains (school: max 1800 min/week or about 4 hr/day; home: max 1680 min/week or 4 hr/day; transport: max 1290 min/week or 3 hr/day; leisure time: max 1680 min/week or 4 hr/day; total PA: max 2540 min/week or about 6 hr/day) as well as in the different intensity levels (max 1260 min/week or 3 hr/day for moderate and vigorous PA). The PA levels were then categorized according to the tertiles in this study population.

Anthropometric measurements

Weight and height of the adolescents were measured by trained researchers in a standardized way [30]. Weight was recorded in underwear and without shoes to the nearest 0.1 kg, using an electronic scale (Type SECA 861). Height was measured barefoot in the Frankfort horizontal plane to the nearest 0.1 cm, using a telescopic height measuring instrument (Type SECA 225). Body Mass Index (BMI) of the adolescents was calculated as body weight in kg divided by the square of height in meters. The corresponding BMI z-scores, relative to the British 1990 Growth Chart References, were determined in order to obtain comparable values across both sexes and all ages [31]. The BMI z-score is the number of standard deviation units that a person's BMI deviates from a mean or reference value.


In total, 3528 adolescents were recruited within the HELENA study. Of those, 2511 completed at least 75% of the IPAQ-A and filled in the HELENA-DIAT for at least two days. Crete could not be include in the 24-h dietary recall analyses since only a minority of the study population completed two 24-h recall days. Hungary could also not be included since no nutrient information was available. Therefore, only 8 study centers could be included for the 24-h dietary recall analyses (Stockholm, Dortmund, Ghent, Lille, Athens, Rome and Zaragoza) and finally, 2176 cases (46.2% male) remained eligible for further analyses. The excluded group was equally distributed for sex (50.1% male). A higher percentage of adolescents with high educated parents was seen in the included compared to the excluded sample (72.2% and 65.6% respectively). No differences were found between the included and excluded group for age, 14.7 years (SD 1.24) and 14.7 years (SD 1.20) respectively, and BMI, 21.1 (SD 3.65) and 21.7 (SD 3.84) respectively.

Data analyses

The Statistical Package for the Social Sciences for Windows version 15 (SPSS Inc., Chicago, IL, USA) was used for data management and analyses. Descriptive statistics, including means, standard deviations (SD) or standard errors (SE) were calculated for each variable.

To compare the energy and nutrient intake and the food consumption between groups of adolescents with different PA levels (1st to 3rd tertile), analyses of covariance (ANCOVA) was used. The analyses were stratified for sex and controlled for age, BMI z-score, parental education which is defined by the highest level of education of the mother or father (low: lower education and lower secondary; high: higher secondary and higher education/university degree), study centre region (North: Stockholm; Central: Dortmund, Ghent, Lille; South: Athens, Rome, Zaragoza) and tanner stage (pubertal stage). To balance between type I and type II errors, an alpha level of p < 0.05 was used to decide upon statistical significance. Furthermore, a Bonferroni post-hoc test was conducted to make pair wise comparisons between the different PA tertiles.


Descriptive information (parental education level, tanner stage, region, age, BMI and time spent in MVPA) of the study sample can be found in Table 2. Age and total minutes spent in MVPA per week seemed to differ between the PA levels. In both sexes, those spending least time in MVPA were significantly older than those spending more time in MVPA. No differences could be found for BMI among the three PA levels.

Table 2 Descriptive statistics (parental education, tanner stage, region, age, BMI and time spent in MVPA) of the study sample.

Table 3 and 4 show the results of the ANCOVA, stratified for sex, for self-reported PA levels and daily intake of energy and nutrients and food groups respectively. Table 3 shows that the mean daily energy intake did not differ significantly between the three PA levels in both sex groups. For the intake of the nutrients, differences could be found for the intake of saccharides, polysaccharides, protein, water and vitamin C between the PA levels in the male group. The least active males (1st tertile) consumed less vitamin C and water compared to the most active ones (3rd tertile). For water also a higher intake was seen in the most active males (3rd tertile) compared to those of tertile 2. The intake of protein only differed between adolescents of tertile 2 and 3, with those of tertile 3 showing the highest intake. The most active males (3rd tertile) also showed a lower intake of saccharides and a higher intake of polysaccharides compared to the least active ones (1st tertile). For the polysaccharides, a difference was also seen between the males of tertile 1 and 2. In the female group, only a difference could be found for the intake of polysaccharides. Females with the highest physical activity level (3rd tertile) consumed more polysaccharides compared to their least active peers (1st tertile).

Table 3 Results of analyses of covariance of physical activity levels and daily intake of energy and nutrients1,2
Table 4 Results of analyses of covariance of physical activity levels and daily intake of foods1,2

When looking at the food groups (Table 4), the consumption of fruit, milk products and cheese seemed to differ significantly between the PA levels in both sexes. For fruit and cheese, the difference was greater in the male group. The Bonferroni post-hoc test showed a significant higher intake of fruit by the most active males (3rd tertile) compared to the least active (1st tertile) and those from tertile 2. The same trend could be observed in females, but the post hoc tests were not significant. The least active males (1st tertile) also reported to eat more cheese compared to those from tertile 2 and 3, whereas only a difference between tertile 1 and 3 could be found in the female group. The difference in milk consumption was greater in the female group. The Bonferroni post-hoc test showed a significant lower intake of milk products by the least active females (1st tertile) compared to the most active (3rd tertile) and those from tertile 2. For the males, the post hoc tests were not significant. A difference in the consumption of grain products and potatoes, vegetables and meat, fish, eggs, meat substitutes and vegetarian products was also reported in the male group. The least active males (1st tertile) consumed more grain and potatoes than those from tertile 2, while the the males spending most time in MVPA (3rd tertile) reported to eat more meat, fish, eggs, meat substitutes and vegetarian products compared to the those from tertile 1 and 2. The females spending less time in MVPA (1st tertile), reported to consume most spreads compared to females in the other two PA levels (2nd and 3rd tertile). The Bonferroni post-hoc test also revealed that females in the highest PA level (3rd tertile) reported to consume less bread and cereal products than females in the lowest PA level (1st tertile).

In both the male and female adolescents, no differences in the consumption of products from the remaining food groups could be found between the levels of PA.


In both, male and female adolescents, the energy intake did not differ significantly between the three PA levels. Cavadini et al. [32] found, in a small subsample of 11-15 year old adolescents, that the energy intake was higher among those who participated more frequently in sport activities, but this trend also seemed statistically non-significant. Croll et al. [33] revealed a higher mean daily energy intake among sport-involved males compared to non-sport-involved males, whereas no difference could be found in the female group. In a study with African-American girls, the total caloric intake was also not significantly associated with PA [34]. Not finding any univocal results between those studies and the present one, could be explained by the fact that energy expenditure from physical activity is only a part of the total energy expenditure. It is noteworthy that longitudinal studies are necessary to examine the energy balance among adolescents in more depth. In addition, sedentary lifestyles have recently been linked to a higher food intake and should therefore be kept in mind when estimating the energy requirements. As sedentarism cannot be seen as the opposite of physical activity, it is possible that a highly physically active person, also shows more sedentary behaviors by means of compensation [35]. Furthermore, the physical activity induced energy expenditure is a variable factor in the energy balance equation. The level of physical activity can vary from day to day within a person. Adaptations in the level of physical activity does not always result in immediate changes in energy intake, in other words energy intake and energy expenditure do not balance on a daily basis [36].

Concerning the food intake, both in the male and female group, significant differences were found for the consumption of fruit, milk products and cheese. A higher consumption of fruit and milk products was reported by the most active adolescents compared to the least active ones. On the other hand, adolescents reporting to spent more time in MVPA, consumed less cheese compared to those spending less time in MVPA. The higher fruit and milk consumption within the more active adolescents is in line with previous studies [16, 32], which observed positive associations between the consumption of fruit and dairy products and higher physical activity levels in both boys and girls.

In the female group, a higher consumption of bread and cereal products was found for those spending less time in MVPA compared to their more active peers. For males, the intake of those products was similar between the different PA levels. In a study by Cavadini et al. [32], no difference in bread consumption between athletic and non-athletic adolescents was shown. In addition they observed higher cereal consumption in the more active group, especially among girls, which is in discrepancy with our findings. In the present study, bread and cereals were seen as one food group, whereas Cavadini et al. [32] examined the intake of bread and cereals separately and this could be an explanation for the inconsistent results between both studies.

Furthermore, the consumption of products from the remaining food groups did not differ between the levels of PA. Previous research also revealed no relationship between the time spent in MVPA and the frequency of snacking and intake of sugared beverages [16, 32, 34]. The above mentioned findings concerning the food consumption, indicate that spending more time in physical activities does not exclusively result in healthier eating habits. While some studies suggest that active people are inclined to eat healthier diets [18], there are also a lot of discrepancies found in the literature examining the correlations between multiple health behaviors [12].

Next to the differences found in the intake of the above mentioned food groups between the PA levels, differences in some nutrient intakes could be found. The more active male adolescents showed a higher intake of polysaccharides, protein, water and vitamin C. On the other hand, a lower intake of saccharides was observed in those adolescents. The higher water and vitamin C intake could be explained by the higher consumption of fruit and vegetables, which are known to be rich of those nutrients. The higher consumption of meat, fish, eggs, meat substitutes and vegetarian products can be the reason for the higher protein intake observed in the more active males. The differences found for the saccharides and polysaccharides is difficult to explain. Fruit is a source of saccharides, whereas vegetables and grains and potatoes provide more polysaccharides. This is in contrast with the differences found between those nutrients. A possible explanation for not finding parallel differences in nutrient intake with differences in food group intake, could be that the consumption of different foods, compensate the nutrient intake. A higher consumption of one food product, but a lower intake of another, could stabilize the nutrient intake, especially on population level. Also, a lack of meaningful difference in the amount of foods consumed could be an explanation for not finding more significant differences in the intake of nutrients among the physical activity levels. For example, the range of difference in gram for vegetables for males among the 3 PA levels was only 17 gram and the difference for spreads in the female group was only 3.3 gram. More detailed research is necessary to examine the relation between the nutrient and food intake. On the other hand, not finding more significant differences in nutrient intake between the more active and less active adolescents, is again an indication for the fact that physical activity is not automatically correlated with healthier diets.

When interpreting the results of the present study we have to keep in mind some limitations. The instruments to assess dietary intake and PA were self-reporting questionnaires and those have their well known disadvantages. The limitations of those instruments could cause inaccuracy in the time spent in PA and the nutrient and food intake assessed. In fact, misreporting is a common problem in assessing dietary habits and PA in adolescents [37, 38]. Evidence for under-reporting of food intake with self-reported dietary assessments has been revealed previously, especially in girls [39]. It also appears that the food intake data of most adolescents are particularly prone to reporting error, also at the group level [40]. Furthermore 2 days of 24 h recall are scientifically not ideal, although more days were practically not possible. Therefore the dietary intake data has been corrected for within and between person variability according to the MSM method [24], so the reporting error could be partly counteracted. Furthermore, it is most likely that the reported minutes of MVPA are not equal to the total energy expenditure, which also has to be linked to other factors like BMR (basal metabolic rate), growth, etc. On the other hand, both questionnaires have been tested and validated before use in the HELENA study [21, 22, 28]. It should also be mentioned that the study population is an urban population and that extrapolation to a general European population should be treated cautiously. Strengths of the present study are the large sample size and diverse geographical origin in Europe. Also, the highly standardized procedures used within the HELENA study are an important strength. In addition, this study is one of the first in examining the association between dietary intake, on both the nutrient and food group level, and PA levels among European adolescents.


From the present results it can be concluded that dietary habits diverge between adolescents with different self-reported PA levels. For some food groups a significant difference in intake could be found between the more active and less active adolescents. Those differences found, were also reflected in differences in some nutrient intakes. Furthermore, adolescents within each PA level, reported an equal consumption of foods from the remaining food group. Therefore, the present findings are an indication that the more physically active adolescents are not always inclined to eat healthier diets than their less active peers. Because food habits and PA, have both been associated with several chronic diseases [1, 2], both behaviors should be taken into account when examining health and development of those diseases. Optimizing the diet quality in both the inactive and active adolescents and increasing the time spending in MVPA in those with low PA levels still remain necessary in interventions.


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The HELENA study took place with the financial support of the European Community Sixth RTD Framework Programme (Contract FOOD-CT: 2005-007034). This work was also partially supported by the European Union, in the framework of the Public Health Programme (ALPHA project, Ref: 2006120), the Swedish Council for Working Life and Social Research (FAS), the Spanish Ministry of Education (EX-2007-1124, and EX-2008-0641), and the Spanish Ministry of Health, Maternal, Child Health and Development Network (number RD08/0072) (JPRL, LAM). The content of this paper reflect only the authors' views and the rest of HELENA study members and the European Community is not liable for any use that may be made of the information contained therein. The members of the HELENA study group (L.A. Moreno, F. Gottrand, S. De Henauw, M. González-Gross, C. Gilbert, A. Kafatos C. Libersa, J. Sánchez, M. Kersting, M. Sjöstrom, D. Molnár, J. Dallongeville, G. Hall, L. Maes, L. Scalfi, P. Meléndez, J. Fleta, J. A Casajús, G. Rodríguez, C. Tomás, M.I. Mesana, G. Vicente-Rodríguez, A. Villarroya, C.M. Gil, I. Ara, J. Revenga, C. Lachen, J. Fernández Alvira, G. Bueno, A. Lázaro, O. Bueno, J.F. León, J.Ma Garagorri, M. Bueno, J. Pablo Rey López, I. Iglesia, P. Velasco, S. Bel, A. Marcos, J. Wärnberg, E. Nova, S. Gómez, E. Ligia Díaz, J. Romeo, A. Veses, M. Angeles Puertollano, B. Zapatera, T. Pozo. L. Beghin, C. Libersa, C. Iliescu, J. Von Berlepsch, W. Sichert-Hellert, E. Koeppen, E. Erhardt, K. Csernus, K. Török, S. Bokor, Mrs Angster, E. Nagy, O. Kovács, J. Répasi, C. Codrington, M. Plada, A. Papadaki, K. Sarri, A. Viskadourou, C. Hatzis, M. Kiriakakis, G. Tsibinos, C. Vardavas M. Sbokos, E. Protoyeraki, M. Fasoulaki, P. Stehle, K. Pietrzik, C. Breidenassel, A. Spinneker, J. Al-Tahan, M. Segoviano, A. Berchtold, C. Bierschbach, E. Blatzheim, A. Schuch, P. Pickert, M. J. Castillo Garzón, Á. Gutiérrez Sáinz, F.B. Ortega Porcel, J.R. Ruiz, E. García Artero, V. España Romero, D. Jiménez-Pavón, C. Sánchez Muñoz, V. Soto, P. Chillón, J.M. Heredia, V. Aparicio, P. Baena, C.M. Cardia, A. Carbonell, D. Arcella, G. Catasta, L. Censi, D. Ciarapica, M. Ferrari, C. Le Donne, C. Leclerq, L. Magrì, G. Maiani, R. Piccinelli, A. Polito, R. Spada, E. Toti, L. Scalfi, P. Vitaglione, C. Montagnese, I. De Bourdeaudhuij, T. De Vriendt, C. Matthys, C. Vereecken, M. de Maeyer, C. Ottevaere, K. Widhalm, K. Phillipp, S. Dietrich, B. Kubelka, M. Boriss-Riedl, Y. Manios, E. Grammatikaki, Z. Bouloubasi, T. Louisa Cook, S. Eleutheriou, O. Consta, G. Moschonis, I. Katsaroli, G. Kraniou, S. Papoutsou, D. Keke, I. Petraki, E. Bellou, S. Tanagra, K. Kallianoti, D. Argyropoulou, K. Kondaki, S. Tsikrika, C. Karaiskos, A. Meirhaeghe, S. Bokor, N. Fievet, L. Goumidi, P. Bergman, M. Hagströmer, L. Hallström, M. Hallberg, E. Poortvliet, J. Wärnberg, N. Rizzo, L. Beckman, A. Hurtig Wennlöf, E. Patterson, L. Kwak, L. Cernerud, P. Tillgren, S. Sörensen, J. Sánchez-Molero, E. Picó, M. Navarro, B. Viadel, J. Enrique Carreres, G. Merino, R. Sanjuán, M. Lorente, M. José Sánchez, S. Castelló, S. Thomas, E. Allchurch, P. Burguess, G. Hall, A. Astrom, A. Sverkén, A. Broberg, A. Masson, C. Lehoux, P. Brabant, P. Pate, L. Fontaine, A. Sebok, T. Kuti, A. Hegyi, C. Maldonado, A. Llorente, E. García, H. von Fircks, M. Lilja Hallberg, M. Messerer, M. Larsson, H. Fredriksson, V. Adamsson, I. Börjesson, L. Fernández, L. Smillie, J. Wills, A. Meléndez, P.J. Benito, J. Calderón, D. Jiménez-Pavón, J. Valtueña, P. Navarro, A. Urzanqui, U. Albers, R. Pedrero, J. José Gómez Lorente) are gratefully acknowledged.

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Authors' contributions

CO participated in the design of the study, data collection, analysis, interpretation of the results and drafted the manuscript. IH was involved in manuscript drafting and coordinated the statistical analysis. IH, IDB, SDH and MH contributed to the results interpretation, and editing of the manuscript. LAM coordinated the total HELENA study on international level. LAM, FG, AK, MS and KW were involved in the design of the HELENA study and locally coordinated the project. CO, LB, MMC and CLD performed the data collection locally. All authors participated in the writing of the paper and provided comments on the drafts and approved the final version.

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Ottevaere, C., Huybrechts, I., Béghin, L. et al. Relationship between self-reported dietary intake and physical activity levels among adolescents: The HELENA study. Int J Behav Nutr Phys Act 8, 8 (2011).

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