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Logo of ijbenutrBioMed CentralBiomed Central Web Sitesearchsubmit a manuscriptregisterthis articleThe International Journal of Behavioral Nutrition and Physical ActivityJournal Front Page
Int J Behav Nutr Phys Act. 2009; 6: 54.
Published online Aug 12, 2009. doi:  10.1186/1479-5868-6-54
PMCID: PMC3224918

Psychosocial correlates of eating behavior in children and adolescents: a review

Abstract

Background

Understanding the correlates of dietary intake is necessary in order to effectively promote healthy dietary behavior among children and adolescents. A literature review was conducted on the correlates of the following categories of dietary intake in children and adolescents: Fruit, Juice and Vegetable Consumption, Fat in Diet, Total Energy Intake, Sugar Snacking, Sweetened Beverage Consumption, Dietary Fiber, Other Healthy Dietary Consumption, and Other Less Healthy Dietary Consumption in children and adolescents.

Methods

Cross-sectional and prospective studies were identified from PubMed, PsycINFO and PsycArticles by using a combination of search terms. Quantitative research examining determinants of dietary intake among children and adolescents aged 3–18 years were included. The selection and review process yielded information on country, study design, population, instrument used for measuring intake, and quality of research study.

Results

Seventy-seven articles were included. Many potential correlates have been studied among children and adolescents. However, for many hypothesized correlates substantial evidence is lacking due to a dearth of research. The correlates best supported by the literature are: perceived modeling, dietary intentions, norms, liking and preferences. Perceived modeling and dietary intentions have the most consistent and positive associations with eating behavior. Norms, liking, and preferences were also consistently and positively related to eating behavior in children and adolescents. Availability, knowledge, outcome expectations, self-efficacy and social support did not show consistent relationships across dietary outcomes.

Conclusion

This review examined the correlates of various dietary intake; Fruit, Juice and Vegetable Consumption, Fat in Diet, Total Energy Intake, Sugar Snacking, Sweetened Beverage Consumption, Dietary Fiber, Other Healthy Dietary Consumption, and Other Less Healthy Dietary Consumption in cross-sectional and prospective studies for children and adolescents. The correlates most consistently supported by evidence were perceived modeling, dietary intentions, norms, liking and preferences. More prospective studies on the psychosocial determinants of eating behavior using broader theoretical perspectives should be examined in future research.

Background

Diets high in fat and sugar, and low in fruit, vegetables and fiber, have been related to obesity, risk for type 2 diabetes [1,2], cardiovascular disease [3-6], and some cancers [7,8]. Dietary habits tend to form early and track from childhood into adulthood [9,10]. Therefore, the promotion of healthy diet in children and adolescents is a priority to help promote health and well-being, prevent future disease, and reduce the current epidemic of pediatric obesity [11].

To develop effective dietary interventions for children and adolescents, it is necessary to understand the factors that determine eating behavior in these populations. Research has repeatedly shown that theory-based interventions that are guided by relevant behavioral theories are more likely to significantly impact dietary behaviors in youth [11-13]. Theory-based research is fundamental to the understanding of health behaviors by providing a framework by which to examine the relationships among constructs [11,14-16], to assess the impact of the various constructs [11,14,17], and to delineate factors and determinants to be studied [11,15,16,18]. Theory adds coherence and effectiveness to research by identifying facilitating situations and relevant processes and guiding timing and sequencing of events [11,15,16,18]. A good theory indicates methods of intervention and evaluation [11,15,16,18].

The current review represents an updated comprehensive review of psychosocial correlates of a broad range of eating behaviors among children and adolescents. Earlier reviews in youth and adults have focused mainly on determinants of fruit and vegetable intake [19,20], healthy eating [21,22], or environmental factors related to diet [23,24]. For instance, Rasmussen et al [19] recently published a review that examined a broad range of correlates, including psychosocial and environmental correlates, focused exclusively on fruit and vegetable intake. However, recent science has shown that sugar and fiber intake is closely related to insulin dynamics and body composition [25,26]. Sugar sweetened beverage intake is associated with weight gain [27]. Dietary fat has also been shown to have an effect on body fat and on total energy intake [28]. Psychosocial determinants that predict dietary behavior in children and adolescents are not necessarily the same as those that predict dietary behavior in adult populations [11]. Psychosocial as well as dietary intake measures that have been validated in adults are not necessarily valid in younger populations [11]. Some research has suggested that less cognitively-based, more emotionally-based determinants drive adolescent health-related behavior [11,29]. For adolescents and young adults, the immediate satisfaction of psychological needs and adherence to the individual's personal meanings have been shown to be strong motivators and determinants of health behaviors in this age group [30,31]. Research has shown that these age-related differences may be related to neurological development [32].

Therefore, we conducted a systematic review of psychosocial correlates of dietary behaviors in children and adolescents, and included not only fruit and vegetable consumption, but also fat intake, total energy intake, sugar snacking, sweetened beverage consumption, fiber intake, other healthy dietary consumption, and other less healthy dietary consumption. Psychosocial factors are constructs defined here as referring to internal processes in interaction with (but not including) the social environment, and is often used in the context of psychosocial interventions that point towards solutions for individual challenges within the context of the social environment. Socio-demographic and environmental correlates were not reviewed. Our review focused on addressing the following two research questions:

a. Which psychosocial correlates of energy, fruit, juice, vegetable, fat, sugar snacking, sweetened beverages, fiber, and other dietary consumption have been studied specifically in youth?

b. Which psychosocial factors are clearly and consistently associated with these dietary behaviors in youth?

Methods

Data sources and search strategy

Medical and psychosocial databases (e.g. PubMed, PsychINFO, PsycArticles) as well as references cited in earlier reviews, primary studies and collected articles served to identify potential articles that examined associations between psychosocial factors and dietary intake in pediatric populations. Only papers published in English, between 1990 and May 2009, describing psychosocial factors related to dietary intake were considered for review. No literature searches were conducted after May 27, 2009.

Our search strategy involved using a combination of dietary intake keywords with psychosocial factor keywords to identify relevant articles. For dietary intake, the following keywords were used: eating behavior, dietary behavior, consumption, junk food, high fat food, sodium, fiber, calcium, soda, soft drink, snack food, sugar-laden, beverage, sugar, fast food, sweets, fruit, vegetable, juice, fruit consumption, fruit intake, vegetable consumption, vegetable intake, dietary fat, nutrition, and diet. For psychosocial factors, the following keywords were used: determinants, correlates, self-efficacy, social support, mediation, mediating variables, psychosocial variables, social cognitive theory (SCT), self determination theory (SDT), theory of reasoned action (TRA), theory of planned behavior (TPB), transtheoretical model (TTM), health belief model (HBM), stages of change, SCT, TRA, HBM, SDT, TPB, outcome expectancies, barriers, psychosocial correlates, psychosocial predictors, psychosocial determinants, social theory, psychosocial factors, motivation, knowledge, attitudes, theory, and modeling.

Inclusion/exclusion criteria

Each study had to meet the following inclusion criteria to be included in this review: people less than 18 years (or mean age within this range) as study sample (special populations were excluded, including pregnant women and athletes); at least one psychosocial variable as an independent variable; a measure of dietary intake (e.g. total energy, fat intake, fruit, vegetable, snack, fast food, calcium, fiber or soft drink consumption) as the dependent variable(s); the papers had to include enough statistical data to be incorporated in the review. Specifically, a correlation coefficient, odds ratio, or beta value as well as a p-value to indicate statistical significance of relationships with a measure of dietary intake were required for inclusion. Because the literature on correlates of eating behaviors in youth is vast, we limited this review paper to cross-sectional and prospective studies. We are currently undertaking a review of determinants of dietary change in intervention studies.

Identification of relevant studies

Potentially relevant papers were selected by screening the titles (first step), abstracts (second step), and the entire article (third step) retrieved through the database searches. Two researchers (A.M. and C.C.) independently conducted this screening. Disagreement about eligibility between the reviewers was resolved through discussion with a third coauthor (S.R).

Data extraction

Two authors (A.M. and C.C.) extracted the data from the identified studies. The research design rating presented for each study was developed by using three previously published rating schemes [33-35]. Based on the quality of the research design, each study was given a rating with one to four asterisks. A.M. and C.C. rated the studies and then cross-checked their results. Disagreement between the reviewers was resolved through discussion with S.R. The criteria used to determine the rating of each study is listed in Table Table1.1. Each study's findings and methodological details, such as sample population details, dietary outcomes, psychosocial determinants assessed, assessment methodology (child and/or parent-report, measurement name, reliability, validity), and statistical analysis methods are listed in Tables Tables22 and and33.

Table 1
Study Design Evaluation Criteria
Table 2
Design and Methodological Characteristics of All Included Articles
Table 3
Evaluation of Dietary Measurement Instrument

Summarizing study findings

Modeling after Sallis' review of the psychosocial determinants of physical activity in children and adolescents [36], associations between psychosocial factors and dietary outcomes were coded as '+' for a positive association and '-' for a negative association. Associations were regarded significant when the p-value reported in the study was <0.05. For studies that reported results from univariate and multivariate analysis, we only reported the multivariate results. The results of multivariate analyses provide a more accurate description of a relationship because they control for other potential confounding variables. Using the above-mentioned criteria, 97 distinct psychosocial constructs were found. In order to reduce the number of variables, we combined conceptually similar psychosocial factors (e.g. appeal of food was combined with preference). Outcome categories were created if there were at least 5 articles that addressed the same specific dietary outcome. This decision rule elicited 8 categories, 6 for specific dietary outcomes and 2 'other' categories: Fruit, Juice and Vegetable Consumption, Fat in Diet, Total Energy Intake, Sugar Snacking, Sweetened Beverage Consumption, Dietary Fiber, Other Healthy Dietary Consumption, and Other Less Healthy Dietary Consumption. Findings are reported below using these categories. Consistent findings were defined as having a relationship in the same direction over 60% of the time as seen in at least two independent articles.

Results

Search and selection of studies

The databases search located 4460 titles (Pubmed 3336; PsychInfo 1124) of potentially relevant articles. Other scholarly databases did not yield any new titles. Reference sections of earlier reviews and primary studies added forty-four titles. Screening the titles and abstracts resulted in a selection of 146 articles for full-text review. Sixty-nine of these articles did not meet the inclusion criteria, resulting in a final inclusion of 77 articles.

From the evaluation of the design and methodology of each paper (Table (Table2)2) the main findings are as follows:

• Forty-eight (62%) of the included papers were studies conducted in the United States (US).

• Sixty-four (83%) were cross-sectional studies [37-100]. Eleven (14%) were prospective studies [101-111]. Two (3%) were experimental studies [112,113].

• Forty-four (57%) studies had a sample smaller than 500 individuals.

• Forty-three (56%) studies were conducted in children (mean age of less than 13 years); whereas thirty-four (44%) were conducted with adolescents.

• Thirty-five (45%) studies were conducted in ethnically diverse populations. Six (8%) were among African Americans only; two (3%) among Caucasians only; two (3%) among Hispanics only; and thirty (39%) had insufficient information for assessing representativeness.

• To assess dietary behaviors, eight studies used variations of a 24-hour dietary recall; twelve used variations of a food record; twenty-seven used a food frequency questionnaire (FFQ); In a majority of the studies (twenty-seven papers) it was unclear whether dietary intake was measured with a FFQ or another type of questionnaire, such as a diet screener; two studies used observation; three studies used weighed food intake. [Note: This does not equal 77 articles and percentages are not presented because there was overlap (two studies (3%) used more than one measure).]

• Validity and reliability of the dietary intake measure was reported in more than half of the studies. Thirty studies (38%) reported no information on validity. Thirty-seven studies (48%) referenced previous studies. Eleven studies (14%) assessed validity in the article. Twenty-nine studies (38%) reported no information on reliability. Twenty-seven studies (35%) referenced previous studies. Twenty-one studies (27%) assessed reliability in the article.

• Research design evaluation scores were provided for each study. Forty-nine studies (38%) were rated as strong. Twenty-five studies (32%) were rated as acceptable. Only two studies (3%) were rated as exceptional. One study (1%) rated as weak.

• Psychosocial determinants of:

○ fruit, vegetable, and fruit juice intake were examined in 35 studies;

○ fat intake in 16 studies;

○ energy intake in 15 studies;

○ sugar snacking in 12 studies;

○ fiber intake in 10 studies;

○ other dietary consumption (e.g. calcium, healthy dietary behavior, milk intake, fast food) in 14 studies.

○ 13 studies assessed multiple dietary behaviors (e.g., fruit, vegetable, fruit juice and fat) and since there is overlap, percentages are not presented.

Table Table33 gives a summary frequency of the use of dietary measures and the percentage of time a dietary measure produced significant findings.

• 35% of studies used a food frequency questionnaire and 36% of studies used other questionnaires (it was unclear whether dietary intake was measured with a food frequency questionnaire or another type of questionnaire such as a food screener).

• Dietary intake as measured by food frequency questionnaire was significantly related to a psychosocial correlate with 58% frequency; dietary intake as measured by other types of questionnaires was related to a psychosocial correlate with 57% frequency. Dietary intake as measured by food records and food recalls were significantly related to a psychosocial correlate with 61% and 50% frequency, respectively.

Tables Tables4,4, ,5,5, ,6,6, ,7,7, ,8,8, ,9,9, ,10,10, ,1111 summarize the associations between potential determinants of dietary intake among children and adolescents. The determinants were grouped by dietary category: fruit, fruit juice, and/or vegetable consumption, fat intake, total energy intake, sugar snacking, sweetened beverage consumption, fiber intake, other "healthy" dietary consumption, and other less healthy dietary consumption.

Table 4
Summary of Correlates of Fruit, Juice and Vegetable Intake among Children and Adolescents
Table 5
Summary of Correlates of Fat Intake among Children and Adolescents
Table 6
Summary of Correlates of Total Energy Intake among Children and Adolescents
Table 7
Summary of Correlates of Sugar Snacking among Children and Adolescents
Table 8
Summary of Correlates of Sweetened Beverage Intake among Children and Adolescents
Table 9
Summary of Correlates of Fiber Intake among Children and Adolescents
Table 10
Summary of Correlates of "Healthy" Dietary Consumption among Children and Adolescents
Table 11
Summary of Correlates of Less Healthy Dietary Consumption among Children and Adolescents

Psychosocial Correlates of Fruit, Fruit Juice, and/or Vegetable Consumption

Thirty-five articles tested for psychosocial correlates of fruit, juice, and vegetable consumption defined as consumption of fruit, fruit juice, and/or vegetables (FJV). In several articles, FJV consumption was broken down into more than one outcome variable. Therefore, we report on variables within studies here. Intention to eat healthy was positively associated with FJV consumption in 3 of 5 studies [87,96,104] and for 5 out of 7 variables. Knowledge was positively associated with FJV consumption in 6 of 9 articles [40,42,70,84,96,97] and for 8 out of 13 variables. Interestingly in one study [84]knowledge was positively associated among girls, but not associated among boys. Liking was positively associated with FJV consumption in 4 of 5 articles [42,70,96,97] and for 6 out of 8 variables. Norms were positively associated with FJV consumption in 3 of 5 articles [48,63,92], 6 out of 10 variables. Perceived Modeling was positively associated with FJV consumption in 8 of 9 articles [40,42,47,70,93,96,97,99] and for 14 out of 16 variables. However, modeling as reported by parent did not show any consistent associations. Preferences were positively associated with FJV consumption in 11 of 13 articles [40,42,53,59,60,63,70,78,83,93,106] and for 20 out of 26 variables. None of the other psychosocial variables examined, including attitude, availability, perceived barriers, outcome expectations, self-efficacy, social desirability, and social support showed consistent associations with FJV intake. Table Table44 summarizes the psychosocial correlates of fruit, juice, and/or vegetable consumption among children and adolescents.

Psychosocial Correlates of Fat Intake

Sixteen articles examined psychosocial correlates of fat intake (combined total daily fat, % energy from fat, saturated fat). Overall, none of the factors examined showed consistent associations with dietary fat intake. Knowledge was not significantly associated with dietary fat in two studies [61,75] and 4 out of 4 variables. Perceived modeling was not significantly associated with dietary fat in 2 of 3 studies [74,75] and for 4 out of 5 variables. None of the other factors examined showed consistent associations with dietary fat intake, including social support. However, we were unable to assess the significance of many factors due to the low number of studies that investigated psychosocial variables and their effect on fat intake. Table Table55 summarizes the psychosocial correlates of fat intake among children and adolescents.

Psychosocial Correlates of Total Energy Intake

Fifteen articles investigated the psychosocial correlates of total energy intake. Only two variables were consistently significantly positively associated with total energy intake. Knowledge was positively associated with total energy intake in 4 of 6 articles [44,65,80,86] and for 6 out of 9 variables. Social support was positively associated with total energy intake in 2 of 3 articles [86,98] and for 2 out of 3 variables. None of the other psychosocial variables examined, including intention to eat healthy, perceived modeling, preferences or self-efficacy showed consistent associations with total energy intake. Table Table66 summarizes the psychosocial correlates of total energy intake among children and adolescents.

Psychosocial Correlates of Sugar Snacking

Twelve articles examined the psychosocial correlates of sugar intake, which is defined as consumption of snacks and high sugar-sweetened foods, such as candy. Attitude and intentions were the only two variables consistently significantly associated with sugar snacking. In three studies [37,85,102], 3 out of 3 variables, attitude towards healthy eating behavior was negatively associated with sugar snacking. Intention to consume sugar was positively associated with sugar snacking in all three of the articles in which it was measured [76,102,103] for 3 out of 3 variables. No other factors examined showed consistent associations with sugar snacking due to the small number of articles investigating psychosocial associations with sugar snacking. Table Table77 summarizes the psychosocial correlates of sugar snacking among children and adolescents.

Psychosocial Correlates of Sweetened Beverage Consumption

Ten articles examined the psychosocial correlates of sweetened beverage consumption, which is defined as consumption of sodas, sweetened beverages, and/or juice (alone, not in combination with fruits or vegetables). Intention was found to be positively associated with sweetened beverage consumption in two studies [67,110] and for the two variables measured. Perceived Modeling was shown to be positively associated with sweetened beverage consumption in four studies [47,64,97,110] and for all seven variables measured. However, modeling as reported by parent did not show any consistent associations. Norms were associated with sweetened beverages in all the studies, using all variables. Peer norms and parent norms were positively associated with sweetened beverage consumption in 2 of 3 studies [64,110]. Milk norms were negatively associated with sweetened beverage consumption in 1 of the 3 studies [91]. None of the other variables examined illustrated consistent associations with sweetened beverage consumption. Table Table88 summarizes the psychosocial correlates of sweetened beverage consumption among children and adolescents.

Psychosocial Correlates of Fiber Intake

Five articles evaluated the psychosocial correlates of fiber intake, defined as fiber intake and consumption of high fiber cereal or bread. Both familial and friend social support were positively associated with fiber consumption in 2 studies [38,89] and for 3 out of 4 variables. No other factors examined showed consistent associations with fiber intake. Table Table99 summarizes the psychosocial correlates of fiber intake among children and adolescents.

Psychosocial Correlates of Other "Healthy" Dietary Consumption

Fourteen articles examined the psychosocial correlates of healthy types of dietary consumption, including calcium intake, healthy dietary behavior, green vegetable intake, milk intake, yogurt intake, skim milk (<.1% fat), low fat milk (.5% fat), cereal intake (cornflakes, muesli, etc.), bread intake, and consumption of low fat vending snacks. Norms were positively associated with healthy dietary consumption in 2 of 3 articles [55,91], 5 out of 8 variables. Perceived modeling was positively associated with healthy dietary consumption in two articles [72,97], and for 11 out of 16 variables. Modeling as reported by parent did not show any consistent associations. Social support was positively associated with healthy types of dietary consumption in 3 out of 3 articles [66,71,72] and for 5 out of 8 variables. This association held true among boys, but not girls [71]. Self-efficacy was significantly positively associated with healthy dietary consumption in 4 out of 5 articles [57,66,71,91], 6 out of 9 variables. None of the other variables examined, including attitude or knowledge, illustrated consistent associations with other healthy dietary consumption. Table Table1010 summarizes the psychosocial correlates of healthy dietary consumption among children and adolescents.

Psychosocial Correlates of Other Less Healthy Dietary Consumption

Thirteen articles examined the psychosocial correlates of less healthy types of dietary consumption, including fast food, sodium, medium fat milk (1.5% fat), full fat milk (3% fat), margarine/spread intake, inadequate fruit consumption, inadequate vegetable consumption, and inadequate dairy consumption. Intentions to eat a particular less healthy food were positively associated with less healthy dietary consumption in 3 out of 4 studies [76,107,110] and for 4 out of 5 variables. Perceived Modeling was positively associated with less healthy dietary consumption for 2 of 2 articles [97,110] and for 7 out of the 8 variables measured. Modeling as reported by parent did not show any consistent associations. None of the other variables examined, including attitude towards health or norms, were consistently associated with less healthy dietary consumption. Table Table1111 summarizes the psychosocial correlates of unhealthy dietary consumption among children and adolescents.

Table Table1212 gives a summary review of the most frequently studied psychosocial correlates by dietary outcome.

Table 12
Summary of Correlates of Dietary Behavior among Children and Adolescents

Discussion

This review of the literature on psychosocial correlates of dietary intake in children and adolescents illustrates that perceived modeling and dietary intentions to make healthy or less healthy dietary changes (such as intentions to decrease consumption of sugary beverages or intentions to increase consumption of medium fat milk) have the most consistent and positive associations with eating behavior. Other psychosocial correlates such as liking, norms, and preferences were also consistently and positively associated with eating behavior in children and adolescents. However, somewhat surprisingly, availability, knowledge, outcome expectations, self-efficacy and social support did not show consistent relationships across dietary outcomes.

The recurring relationship between the psychosocial correlates of perceived modeling [19,23,24,114], norms [115], and preferences [19,22,114] in predicting eating behavior in children and adolescents is supported in other reviews [19,22-24,114,115]. For example, in a review that focused on the environmental correlates of obesity-related dietary behavior in youth, van der Horst et al. found the most consistent associations between parental intake and children's fat and F&V intake [23]. That review also found the most consistent association between parent and sibling intake with adolescents' energy and fat intake [23]. A review on determinants of fruit and vegetable intake by Rasmussen et al. also illustrated a positive association between parental intake and fruit and vegetable intake [19]. The current review supports modeling as one of the most powerful psychosocial predictors of dietary intake in youth. However, our review is unique because it illustrates that perceived modeling is the single most consistent correlate of eating behavior. Modeling as reported by a parent is not consistently correlated with dietary intake. Second, this review is unique in its finding that intentions was also a consistent correlate of eating behavior across various samples of children and adolescents and various dietary outcomes.

Our results are quite dissimilar to a recent review of predictors of dietary behavior (fruit and vegetable intake in particular) among adults [20], and this emphasizes the need to examine psychosocial correlates of youth separately from those of adults. The recent review among adults showed that knowledge, self-efficacy, and social support were consistent predictors of fruit and vegetable intake, while we found that these variables did not predict eating behavior in children and adolescents. This finding highlights the fact that findings from adult research do not necessarily apply to pediatric populations; thus it is imperative that research and interventions in youth be tailored specifically to that population.

Self-report food frequency questionnaires (FFQs) and other types of self-report questionnaires or screeners were the most frequently used methods to measure dietary intake in youth. Only 10% of studies used dietary recalls and 16% used dietary records, which are considered to be more valid means of assessing dietary intake [116,117]. FFQs delivered a higher percentage of significant correlations with psychosocial variables while stronger measures of dietary intake (i.e. dietary recalls or dietary records) resulted in lower frequency of correlation with psychosocial variables. Different methods of measuring dietary intake delivered different results. More research is needed in the implementation of different outcome measures.

Intentions, a cognitive variable, was the second most consistent variable in predicting eating behavior, which runs contrary to literature suggesting that children's behavior is driven by more affective, rather than cognitive determinants. However, the finding that knowledge and self-efficacy were not predictive of eating behavior in children suggests that children may not be as cognitive as their adult counterparts. This review was limited by the fact that there are few studies that incorporate theories of health behavior that focus on affective behavioral pathways. Therefore, assessment of affective predictors of health behaviors in pediatric populations remains limited. Further, most theory-based studies are based on cognitive theories of behavior. However, neurobiological evidence demonstrates age-related changes in cerebral functioning from lower-order, emotionally-based, sensory processing towards higher-order, more cognitive and rational, processing of stimuli by means of the prefrontal cortical systems that involve reward anticipation, self-monitoring, and behavioral inhibition [32]. Thus, the ability to make beneficial nutritional choices and regulate behavior may be affected by the neurobiological development of cognitive abilities that permit the inhibition of responses, delay of gratification and voluntary change of behavior to bypass short-term rewards in favor of longer-term goals [32]. This research supports the hypothesis that the cognitively-based health behavior models developed for adults may not be appropriate for adolescents who tend to be less rational, and more driven by affect. These findings illustrate that it is important to study children separately from adults and to focus on more affect driven psychological models.

Limitations

Despite the strict protocol for assessing each article, there were some limitations to this study. Most of the studies (83%) included in this review were cross-sectional. Consequently, although such designs are useful in identifying possible theory-based associations, drawing conclusions about directionality and possible causality of associations is not possible. Cross-sectional designs can result in systematic error and an overestimation of associations between the psychosocial variables and eating behaviors [118].

The studies included in this review were diverse in the measurement of the psychosocial variables as well as dietary intake, samples, and analyses used. Therefore, it was not possible to conduct a true meta-analysis. Additionally, in order to summarize the findings of the studies, the authors combined conceptually similar psychosocial determinants into one category, which may have introduced bias.

There are also limitations to many of the studies reviewed here. If only the studies ranked as strong or exceptional were included in the review, twenty-six of the 77 articles would be excluded, resulting in a final inclusion of 51 articles. If only these 51 studies are included, norms are no longer associated with eating behavior. Additionally, there are no longer any articles to judge the association between outcome expectations and eating behavior. Besides these changes, the overall results of the review would remain the same. However, the review would be less reflective of the entire literature.

Additionally, most studies relied on self-report of dietary intake, which has been shown to be considerably unreliable, having high rates of mis-reporting, usually in the direction of under-reporting among youth [119]. Furthermore, bias might have been introduced due to possible lack of validity or reliability of both dietary and psychosocial measures. Unfortunately, reliability and validity of dietary and psychosocial measures were not reported in the some of the studies and only a few studies used objective observation to measure the dietary outcome. This illustrates the need for ongoing validity and reliability evaluation to ensure valid and reliable psychosocial and dietary outcome measures for use in cross-sectional as well as longitudinal studies.

Furthermore, certain studies reported only significant findings and did not address non-significant findings; thus there is a potential bias towards significant findings. Our search strategy also only included studies that were published in English in peer-reviewed journals and referenced in electronic databases; therefore, this review may have overlooked important studies published in other languages.

Lastly, this review did not separate children and adolescents into distinct categories, although research has suggested that children and adolescents exhibit different health behaviors [11]. However, separation by age-group yielded too few studies per variable per group to enable interpretation of findings.

Implications and Future Directions

The goal of this literature review was to assess and report the most promising psychosocial correlates of eating behavior in children and adolescents in order to inform development of interventions. A major strength of this review is that it included a diverse and large sample of studies. For example, studies included samples from many different countries, thus enhancing the generalizability of findings to children and adolescents around the world. Because previous reviews have looked at a single eating behavior (e.g. FVJ consumption only) among adult populations [20], this study addresses a key gap in the literature to serve as a tool for behavioral theorists and interventionists by investigating the psychosocial correlates of diverse eating behaviors in children and adolescents. Strong evidence was found for intentions, perceived modeling, norms, liking, and preferences as consistent correlates of the eating behavior of children and adolescents across dietary outcomes. Comparison of the outcomes of this review paper with recent reviews of the adult literature suggests that determinants of eating behavior differ between adult and pediatric populations. For instance, among adults, knowledge and outcome expectations are consistent correlates of eating behaviors, while in children, they are not. This supports our earlier work showing that knowledge does not impact behavior consistently in youth [11]. A key finding from this review is that health behavior theory as well as research on affective pathways relevant to youth populations is lacking.

Future intervention research may benefit from the incorporation of findings from this review to create more effective adolescent and childhood dietary interventions by targeting the variables shown in this review that are most consistently associated with the various eating behaviors such as intentions, modeling, norms, liking, and preferences. Based on the fact that these constructs have repeatedly been found to be related to dietary behavior, intervening on these factors may be the best way to elicit dietary change. Future research should also investigate the variables that have been insufficiently examined to date, particularly the variables rooted in affective theories. It is quite plausible that affective factors, such as motivation [120], executive control [121], or meanings of behavior [122] might drive the dietary behavior of children and adolescents.

Lastly, future research should investigate the psychosocial correlates of several dietary behaviors that are known to influence weight and metabolic health such as fat and fiber [123] that have been understudied.

Conclusion

This review examined the correlates of various dietary intake; Fruit, Juice and Vegetable Consumption, Fat in Diet, Total Energy Intake, Sugar Snacking, Sweetened Beverage Consumption, Dietary Fiber, Other Healthy Dietary Consumption, and Other Less Healthy Dietary Consumption in cross-sectional and prospective studies for children and adolescents. The correlates most consistently supported by evidence were perceived modeling, dietary intentions, norms, liking and preferences. More prospective studies on the psychosocial determinants of eating behavior and broader theoretical perspectives should be examined in future research.

Competing interests

The authors declare that they have no competing interests.

Authors' contributions

ADM carried out the literature review, data extraction, conceptualization, interpretation of the data, and drafted the manuscript. CC participated in the literature review, data extraction, and interpretation of the data. STN participated in the data extraction, interpretation of the data and helped to draft the manuscript. ALY contributed to the conceptualization, data interpretation, and drafting of the manuscript. DSM participated in the conceptualization, data extraction, interpretation of the data and drafting of the manuscript. All authors read and approved the final manuscript.

Acknowledgements

This work was supported by the NCI-funded USC Center for Transdisciplinary Research on Energetics and Cancer (U54 CA 116848)

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