Article | Published:

Maternal and pediatric nutrition

The association of problematic eating behaviours with food quality and body mass index at 7 years of age

Abstract

Background/objectives

There is scarce evidence of how certain eating behaviours compromise the compliance with dietary guidelines and weight status in school-aged children. This study aims to evaluate the association of children’s problematic eating behaviours with food quality and body mass index at 7 years of age.

Subjects/methods

Participants were children aged 7 years old from a population-based cohort study from Porto, Portugal-Generation XXI. Children’s quantity and speed of ingestion, food refusal at the table and food rewards requesting were evaluated by caregiver’s perception. Food consumption was evaluated by a food frequency questionnaire and compared with age-appropriate guidelines. Children’s weight status was assessed by objective measurements and parent’s perceptions. Associations were estimated by logistic regressions (odds ratio (OR), 95% confidence intervals (95% CI)) adjusted for maternal age, education, smoking during pregnancy, birth type, child’s sex, weight-for-gestational age and sports (n = 3801).

Results

Children eating small amounts of food, refusing to eat at the table with the rest of the family during meals and asking for food rewards showed a higher consumption of energy-dense foods (OR = 1.51; 95% CI:1.23–1.86; OR = 1.58; 95% CI:1.16–2.16; OR = 1.56; 95% CI:1.14–2.12) and presented higher odds of consuming fruit and vegetables below recommendations (OR = 1.41; 95% CI:1.22–1.64; OR = 1.20; 95% CI:1.00–1.45; OR = 1.28; 95% CI:1.05–1.55). Children displaying these eating behaviours were less likely to be overweight/obese, hence their parents were less likely to show concern with their weight. Including food quality as covariate in the final models with obesity status did not change the associations.

Conclusions

Problematic eating behaviours were associated with poorer food quality (more energy-dense foods and low fruit and vegetables), but food quality does not seem to explain the association with obesity status. Parents were less likely to be concerned about their child’s weight if the child ate slowly or poorly, and accordingly the odds of them being overweight or obese were lower.

Introduction

Eating behaviours are established during early childhood, and as children grow, some deviations from the expected eating behaviours may be perceived by caregivers [1, 2]. Despite variation on the definition of problematic eating behaviours, these include food refusal (of certain types of foods), food fussiness or pickiness (refusal of new and familiar foods, accepting only a narrow range of foods), refusal of new foods (neophobia), grumpiness during mealtime and inadequate self-feeding skills [1, 3, 4]. The prevalence of these eating behaviours may vary between 7 and 65% [4, 5].

It has been reported that diets of picky eaters may lack variety [6, 7] and quantity [1, 5, 8,9,10,11,12], since the most refused groups are vegetables [5, 8,9,10,11,12,13,14,15,16,17] and fruits [16, 18], because of less palatable tastes, which, according to a longitudinal study, may result in a low energy intake [8]. A longitudinal study has described a higher consumption of sweetened foods among pickier children [16] and such has also been reported among fussier children in cross-sectional analysis [12]. In a longitudinal study, it was reported that fruit and vegetable consumption was associated with a higher child’s enjoyment of food, but negatively related with slowness in eating, food refusal and satiety responsiveness [15]. Nevertheless, total energetic intake of children displaying these behaviours is not always low, as these children tend to compensate with preferred items, namely energy-dense foods [14]. In fact, according to a cross-sectional study, children’s food preferences usually do not comply with dietary recommendations [19].

Eating behaviours seem to have an effect in children weight status as well.

In school-aged children, Satiety Responsiveness/Slowness in Eating and Food Fussiness were negatively associated with weight, while Food Responsiveness, Enjoyment of Food, Emotional Overeating and Desire to Drink were positively associated [20] in a cross-sectional study. Fussy or picky eating behaviours have been associated with child’s body weight in both cross-sectional [21] and longitudinal analyses [10, 14]. According to a cross-sectional study, parents may have misconceptions about their children’s weight [22]. Parents of pre-schoolers showed concern about their children becoming overweight and such concern was prospectively related to parental child-feeding practices [23, 24] that may compromise dietary intake.

To the best of our knowledge, research so far has been largely focused on parental child-feeding practices (overt vs. covert control) or the family food environment, such as exposure or modelling [25, 26]. There has been evidence that children’s problematic eating behaviours compromise the attainment of guideline recommendations for school-aged children, and may equally affect their body weight, but such evidence is scarce.

This study aims to evaluate the association of children’s problematic eating behaviours, perceived by their caregivers, with their food quality and body mass index (BMI) at 7 years of age. We also aimed to examine whether food quality could explain part of the association between problematic eating behaviours and BMI status.

The authors puts into hypothesis that problematic eating behaviours assessed in the present study would be related with poor diet quality and the relation with actual child’s weight would depend on their profile of “food avoidance” (such as eat small amounts, slowly, food refusal) or “food approach” (such as eat large amounts of food) behaviours. Parental concerns with child’s weight and actual weight would be higher among those parents with “food approach” behaviours. The relation between problematic eating behaviours and BMI may be partly explained by children’s food quality.

Methods

Participants

Participants are children from Generation XXI (G21), a prospective population-based birth cohort, described elsewhere [27]. Women were recruited from all public maternity units from Porto, Portugal, between April 2005 and August 2006. A total of 8647 new-borns and 8495 mothers were enroled at baseline. Of the invited mothers, 91.4% agreed to participate [8]. At 4 years of age, a follow-up evaluation took place between April 2009 and August 2011 and 7459 children were evaluated (86% participation rate). At the third follow-up evaluation (7 years old), 6889 children were evaluated between April 2012 and March 2014.

A cross-sectional analysis was conducted with data from the 7-year-old wave. Twins and participants, who had no information for dietary intake, weight and height and the main variables of interest, were excluded. Overall, it includes 3801 children with complete data for the variables of interest. We compared the study sample (n = 3801) characteristics with the remaining cohort (n = 4846) at baseline, and no significant differences were found for child’s sex (51.5 vs. 50.7% of boys, p = 0.460). However, mothers included in this study were slightly older (mean = 29.9; SD = 5.10 vs. mean = 28.2; SD = 5.85; p < 0.001) and more educated (mean = 11.4; SD = 4.28 vs. mean = 9.7; SD = 4.09; p < 0.001) than mothers in the remaining cohort. However, the Cohen’s effect size values were lower than 0.40, suggesting that the magnitude of the differences was not high (i.e., differences were at most part due to the large sample size than due to large differences between participant’s characteristics) [28].

All the phases of the study complied with the Ethical Principles for Medical Research Involving Human Subjects expressed in the Declaration of Helsinki (World Medical Association, 2013). The study was approved by the University of Porto Medical School/S. João Hospital Centre ethics committee and a signed informed consent according to the Declaration of Helsinki was required for all participants.


Data collection

Information on maternal and children characteristics were collected by face-to-face interviews performed by trained researchers, using structured questionnaires or retrieved from medical records.

At baseline, maternal age and education, smoking habits during pregnancy, type of delivery, child’s sex, birth weight and gestational age were available. Weight-for-gestational age was defined according to sex-specific population-based Kramer growth standards [29]. Any breastfeeding duration (at 4 years of age) and family structure and sports practice (at 7 years of age) were asked about.

At 7 years of age, children’s eating behaviours were reported according to the perception of the main caregiver (94% were mothers), using questions concerning: quantity (eating small amounts and large amounts of food) and speed of food intake, refusal to eat at the table with the rest of the family and request for reward-type foods (energy-dense foods) (Table 1). Some of these questions, such as “eat small amounts of food”, “eat very slowly” and “eat large amounts of food”, were derived from subscales of the Children’s Eating Behaviour Questionnaire (CEBQ) [30].

Table 1 Prevalence of 7-year-old children’s problematic eating behaviours perceived by the mother

The original CEBQ has demonstrated stability over time and good psychometric properties in several populations all over the world [30,31,32,33], including the Generation XXI sample at 7 years of age [34]. When testing the correlations between the questions “eat small amounts of food”, “eat very slowly” and “eat large amounts of food” with the corresponding sub-domains in the original CEBQ, i.e., Food Fussiness, Slowness in Eating and Food responsiveness, the point-biserial correlations were moderate to high: rho = 0.300 (p < 0.001), rho = 0.632 (p < 0.001) and rho = 0.523 (p < 0.001), respectively, for the three questions referred.

Dietary intake was assessed by a 38-item food frequency questionnaire (FFQ) covering the previous 6 months. Response frequency options varied between “more than 4 times per day” and “never”. Dietary intake was categorised into below, according to or above dietary guidelines for all food groups except for energy-dense foods, which only had two categories (according to and above guidelines). The dietary guidelines used in this study were recommendation intervals for children of this age using an average of three countries, assessed in a previous study [35]. To assess the validity of the FFQ, 3-day food records were also completed by the main caregiver(s) of a sub-sample of 3511 children, and the dietary intake obtained from both methods were compared using intra-class correlation coefficients (ICCs) and de-attenuated Pearson’s correlation coefficients. The highest ICC was obtained for “vegetable soup” (ICC = 0.430). Significant correlation coefficients were observed for all nutrients; the average of correlation coefficients was 0.42. We also compared the FFQ results with serum biomarkers in a sub-sample of 80 children at 7 years of age. The de-attenuated correlation coefficients were: r = 0.282 (p = 0.120) for plasma concentration of vitamin A and r = 0.425 (p = 0.027) for folate.

Weight and height were objectively measured by trained researchers in accordance with standardised procedures [36]. The BMI was calculated as the weight over the squared height (kg/m2). Each child was then classified according to the age- and sex-specific BMI reference z-scores developed by the World Health Organization [37], and recoded into underweight or normal weight (BMI <2 SD) and overweight/obese (BMI >2 SD).

In addition, caregiver’s perception of their child weight was assessed by four questions of the Child Feeding Questionnaire (Table 2), previously validated in this cohort [38].

Table 2 Prevalence of mother’s perception and concerns about child’s weight at 7 years of age

Statistical analysis

To assess the associations between eating behaviours and food quality, a multinomial logistic regression model was computed, using as reference category children with diet according to guidelines. Different models were run for each eating behaviour, since there were moderate correlations between some of them. Odds ratios (ORs) and the respective 95% confidence intervals (95% CIs) were calculated, after adjustment for maternal age and education, smoking during pregnancy, breastfeeding duration, child’s sex, living with siblings and child BMI z-score at 7 years of age.

To assess the associations between eating behaviours and categories of child’s BMI z-score and mother’s concerns about child’s weight, a binary logistic regression model was computed, after adjustment for maternal age and education, smoking during pregnancy, type of birth, child’s sex, birth weight for gestational age and child’s sports practice.

The selection of confounders in each model was based on a previous literature search to identify a set of potential confounders, and then they were included in each model, based on a stepwise method, to see if they are actual confounders of each association under study. Those that changed the study associations (change of at least 10% in the odds ratios) were kept into models, as co-variables; they were different according to the outcome under study: food quality and weight status.

To test whether food quality explained part of the association between eating behaviours and BMI, we included the different “food quality” variables in the final models having as outcome the obesity status and as exposure the different problematic eating behaviours.

A significance level of 5% was considered in all analyses, performed using IBM SPSS (Statistical Package for Social Sciences) Statistics 24.0™ (SPSS Inc., Chicago, IL, USA).

Results

This study includes 3801 children, 48.5% were girls and one-quarter were overweight or obese at 7 years of age (26.1%) (Table 3).

Table 3 Mother and child’s characteristics

The prevalence of children’s problematic eating behaviours is presented in Table 1. According to mother’s perception, the eating behaviours more frequently reported were “eat very slowly” (53.0%) and “eat small amounts of food” (45.0%) (Table 1). More than 50.0% (55.1%) reported concerns that her child would become overweight or obese (Table 2).

Table 4 shows the prevalence of children’s dietary intake according to guidelines, specific for this age group. Only 57.0% followed the guidelines for fruit and vegetables, similar to dairy products (47.0%). The majority of children (87.0%) consumed energy-dense foods 6 or more times per week (above guidelines).

Table 4 Prevalence of 7-year-old children’s adequacy of intake according to guidelinesa

Table 5 presents the results of the multivariate associations between children’s eating behaviours and food quality. According to mother’s perception, children who eat small amounts of food had significantly higher odds of consuming fruit and vegetables (OR = 1.41; 95% CI: 1.22–1.64) and seafood below recommendations (OR = 1.37, 95% CI: 1.03–1.82), i.e., consume less of those food groups, but consume more energy-dense foods (above vs. within recommendations: OR = 1.51; 95% CI: 1.23–1.86). Children who eat very slowly had higher intake of meat and eggs (above vs. within recommendations: OR = 1.50; 95% CI: 1.13–1.98), but lower of fruit and vegetables (above vs. within recommendations: OR = 0.71; 95% CI: 0.55–0.92), as well as seafood (OR = 0.84, 95% CI: 0.73–0.97). Furthermore, children who ask for food rewards were more likely to eat dairy products, meat and eggs and energy-dense foods above recommendations, but had lower intake of fruit and vegetables (below vs. within recommendations: OR = 1.28; 95% CI: 1.05–1.55). On the other hand, children who refuse to eat at the table during meals had higher odds of energy-dense foods consumption above recommendation (OR = 1.58; 95% CI: 1.16–2.16), but lower odds of eating fruit and vegetables (OR = 0.54; 95% CI: 0.35–0.84) and seafood above recommendations (OR = 0.77; 95% CI: 0.64–0.93).

Table 5 Multivariate associations between children’s eating behaviours and food quality at 7 years of age

Children presenting these eating behaviours were less likely to be overweight or obese, whereas the reverse was observed if they eat large amounts of food (Table 6). When including the “food quality” variables as covariate of these models, the associations remained unchanged. Mothers of children who eat large amounts of food had much higher odds of perceiving their child’s weight as high or very high and the opposite occurred in mothers of children showing the other eating behaviours. Concerns about the child overeating when the mother is absent, being in need of a diet or becoming overweight were less likely in mothers of children who eat small amounts of food or eat very slowly but were more likely when the child eats large amounts of food.

Table 6 Multivariate associations between children’s eating behaviours and children’s overweight/obesity and mother’s concerns about her child’s weight at 7 years of age

Discussion

Different children’s eating behaviours were shown to affect food quality. Children eating small amounts of food, asking for food rewards and refusing to eat at the table with the rest of the family during meals showed a poorer food quality, consuming more energy-dense foods and less fruit and vegetables. Nonetheless, food quality did not explain the association between problematic eating behaviours and children’s obesity status.

In a longitudinal study, Mascola et al. [7] previously concluded that parents of picky eaters (those who reject food, resulting in an insufficient amount of food consumption, somewhat comparable to children eating small amounts of foods in our study) were more likely to state a limited variety of foods consumed by their children. Children with more eating difficulties, as reported by parents at different ages, were also less likely to have more than one serving a day of fruit intake when compared with children with no eating difficulties in three different birth cohorts [1]. However, even with these problematic behaviours, fruit and vegetable intake in the Portuguese children was higher when compared with other European cohorts, such as ALSPAC, UK, and EDEN, France [13]. Furthermore, Galloway et al. [10] also found that children eating small amounts were more likely to eat energy-dense foods above recommendation. Food responsiveness, usually associated with obesity risk, has been correlated with enjoyment of energy-dense foods [15, 39].

In the UK, Fildes et al. [15] concluded that eating slowly was negatively associated with liking both fruit and vegetables and protein foods. Our findings suggest that there seems to be a pattern of children who eat small amounts of food and ask for food rewards, linked to higher consumption of meat and eggs. This difference could be explained by parental concerns on child’s diet. Caregivers perceive them as eating poorly, and they insist on them eating meat and eggs (possibly for their protein value) before the rest of the food on the plate.

In the present study, we found that children who eat very slowly had lower odds of eating fruit and vegetables above recommendations. Fildes et al. [15] concluded that eating slowly was negatively associated with liking these groups, and a positive association of fruit and vegetable liking with enjoyment of food and a negative association with food fussiness were observed.

Other eating behaviours such as refusing to eat at the table with the rest of the family was linked to an unhealthy eating pattern, thus reinforcing the importance of a structured mealtime, since it has been reported that children whose mothers not only ate with them but also ate the same food as them refused fewer foods and were easier to feed compared with children whose mothers did not [40].

As for energy-dense foods, children from our study had consumption above recommendation across all five eating behaviours. In a previous study, eating behaviours of children of similar ages (8–12 years of age) were assessed, as reported by their primary caretakers, namely their mothers, and children showing more fussy behaviours (reported to avoid foods in general, somewhat comparable with some of the problematic eating behaviours assessed in our study, namely eating slowly and small amounts) also showed a preference for fast-food in comparison with their peers, suggesting they might be at risk of being overweight [41]. However, our results only support this positive association with weight gain for those who “eat large amounts of food”. In fact, in the present study we put into hypothesis that child’s weight and parental concerns with child’s weight would be higher among those with children with “food approach” behaviours, such as eat large amounts of food, which was corroborated by the present results.

Eating slowly, as well as satiety responsiveness, stated as a “food avoidance” appetitive trait, were also previously linked to lower obesity risk in children [20]. Similarly, our results showed that children who eat very slowly or small amounts of foods were less likely to be overweight or obese and, accordingly, their parents were less likely to show concern about their weight (not perceiving it as high). However, children who eat excessive amounts of food were more likely to be overweight or obese, and thus their parents were more likely to be concerned about their weight or eating behaviour.

Previous research has described that picky eaters or fussier children (somewhat comparable to those eating small amounts of food in our study) have a lower body mass index [10, 14, 20, 21], as reported in our study. In children participating in the Physical Exercise and Appetite in Children Study (PEACHES) or the Twins Early Development Study (TEDS) aged 7–9 years and 9–12 years, food fussiness showed a graded negative association with weight [20]. De Barse et al. [14] studied 4-year-old fussy eaters and also found that their problematic eating behaviour was linked to a lower BMI and a higher risk of becoming underweight and having lower fat free mass than non-fussy eaters over a 2-year period, revealing the need to careful monitoring growth [14]. In a study, involving Portuguese children aged 3–13 years, food avoidance subscales of the CEBQ (more related with picky eating and fussiness) was also negatively related with BMI z-scores [21]. Nevertheless, a study conducted in 6–7-year-old children has not found an association between picky behaviours and BMI [42], neither other study conducted from 2 to 11 years [7].

As for mother’s concerns about her child’s weight, our results showed an accurate perception of the child’s weight by their caregivers. In literature, little is known about weight perception among parents of normal weight children. However, in a recent study maternal underestimation of weight status was common among both overweight and normal weight children and such was linked to an increased risk of a child being overweight [22]. Weight misconceptions seem to be common by parents of overweight children, as stated in a systematic review [43]. However, mothers of children with a lower BMI are more likely to show concern for undereating, pressuring their children to eat [44]. Misconceptions about child’s weight status, either underestimating or overestimating, may misguide parents’ health-related behaviour and impact their children weight status [22, 45], keeping children away from early detection, preventive actions or even treatment [45,46,47]. Nevertheless, a longitudinal Canadian study reported that mother’s perception of their children’s eating behaviours (13–22% expressing behaviours such as stronger likes or dislikes of foods, threw tantrums when denied foods and need of special meals, etc.) was prospectively associated with a higher body weight, as well as less dietary adequacy (the children consumed a limited variety of foods) at 4–5 years of age [8]. A longitudinal study also stated that children whose parents perceived their weight status accurately had a higher BMI over time, suggesting that parents recognised their child’s being overweight but were possibly not able or were unwilling to manage their child’s weight adequately [48].

Previous research was mainly focused on parental child-feeding practices, while in this study we also explored children’s eating behaviours. In addition, we used data from a population-based cohort of children of the same age with a wide range of eating behaviours, confounding factors and anthropometrics measured, enhancing the internal validity of our study. Some limitations must also be pointed out. Both children’s eating behaviours and dietary intake were reported by their caregivers, and accurate parental assessment of both may be biased. Nonetheless, the validity of the FFQ was assessed, and showed to have modest correlations with 3-day food diaries. The CEBQ, from which some questions used were derived, has also demonstrated stability over time and good psychometric properties in several populations all over the world [30,31,32,33], including the Generation XXI sample at 7 years of age [34]. The questions used in the present study showed moderate-to-high correlations with the original sub-domains of the CEBQ, giving robustness to our questions. Nevertheless, the possibility of misreport cannot be discarded.

The cross-sectional nature of this study is also regarded as a limitation as it did not allow us to establish the correct direction of these associations. Future longitudinal analysis is required to examine these relationships prospectively and to replicate these findings in more diverse groups.

Conclusions

A poor food quality (high consumption of energy-dense foods and low of fruit and vegetables) was associated with children’s eating small amounts of food, asking for food rewards and refusing to eat at the table with the rest of the family during meals. Slowly eating children were also identified as having meat and eggs consumption above recommendations.

Children who eat small amounts of food and very slowly were less likely to be overweight or obese, and accordingly their parents were less likely to show concern about their weight (not perceiving it as high). However, children who eat excessive amounts of food were more likely to be overweight or obese, and thus their parents were more likely to be concerned about their weight or eating behaviour.

Despite these problematic eating behaviours have been significantly associated with both food quality and overweight/obesity status, food quality does not seem to explain the association between problematic eating behaviour and obesity status.

Interventions at an early stage are mandatory, since taste, eating habits and behaviours are defined in early childhood, and tend to prevail in adult age [49,50,51] while carrying a social, emotional and physiological impact [52]. Strategies such as repeated exposure to the taste of a certain food tends to increase its liking by the child [25]. As for BMI associations, in future research, it would be relevant to measure body fat mass composition, since some children with these problematic eating behaviours may have adequate BMI but high fat mass.

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Acknowledgements

We are indebted to all participants for providing the data used in the Generation XXI birth cohort, as well as to all members of the research team and its coordinators (Henrique Barros and Ana Cristina Santos). The authors acknowledge the support from the Epidemiology Research Unit (EPIUnit: UID-DTP/04750/2013).

Funding

Generation XXI was funded by the Health Operational Programme—Saúde XXI, Community Support Framework III and the Regional Department of Ministry of Health. This study was supported through FEDER from the Operational Programme Factors of Competitiveness (COMPETE) and through national funding from the Foundation for Science and Technology (FCT; Portuguese Ministry of Education and Science) under the project PTDC/SAU-EPI/121532/2010 (FCOMP-01-0124-FEDER-021177) and through the Investigator Programme (IF/01350/2015–Andreia Oliveira and IF/01060/2015–Ana Cristina Santos). It also had support from the Calouste Gulbenkian Foundation.

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Conflict of interest

The authors declare that they have no conflict of interest.

Correspondence to Andreia Oliveira.

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