Psychological consequences of childhood obesity: psychiatric comorbidity and prevention
Authors Rankin J, Matthews L, Cobley S, Han A, Sanders R, Wiltshire HD, Baker JS
Received 21 July 2016
Accepted for publication 15 September 2016
Published 14 November 2016 Volume 2016:7 Pages 125—146
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Professor Alastair Sutcliffe
Jean Rankin,1 Lynsay Matthews,2 Stephen Cobley,3 Ahreum Han,3 Ross Sanders,3 Huw D Wiltshire,4 Julien S Baker5
1Department of Maternal and Child Health, University of the West of Scotland, Paisley, 2MRC/CSO Social and Public Health Sciences Unit, Institute of Health and Wellbeing, University of Glasgow, Glasgow, Scotland; 3Department of Exercise and Sport Science, University of Sydney, Sydney, Australia; 4Cardiff School of Sport/Ysgol Chwaraeon Caerdydd, Cardiff Metropolitan University, Cardiff, UK; 5School of Science and Sport, Institute of Clinical Exercise and Health Science, University of the West of Scotland, Hamilton, Scotland
Abstract: Childhood obesity is one of the most serious public health challenges of the 21st century with far-reaching and enduring adverse consequences for health outcomes. Over 42 million children <5 years worldwide are estimated to be overweight (OW) or obese (OB), and if current trends continue, then an estimated 70 million children will be OW or OB by 2025. The purpose of this review was to focus on psychiatric, psychological, and psychosocial consequences of childhood obesity (OBy) to include a broad range of international studies. The aim was to establish what has recently changed in relation to the common psychological consequences associated with childhood OBy. A systematic search was conducted in MEDLINE, Web of Science, and the Cochrane Library for articles presenting information on the identification or prevention of psychiatric morbidity in childhood obesity. Relevant data were extracted and narratively reviewed. Findings established childhood OW/OBy was negatively associated with psychological comorbidities, such as depression, poorer perceived lower scores on health-related quality of life, emotional and behavioral disorders, and self-esteem during childhood. Evidence related to the association between attention-deficit/hyperactivity disorder (ADHD) and OBy remains unconvincing because of various findings from studies. OW children were more likely to experience multiple associated psychosocial problems than their healthy-weight peers, which may be adversely influenced by OBy stigma, teasing, and bullying. OBy stigma, teasing, and bullying are pervasive and can have serious consequences for emotional and physical health and performance. It remains unclear as to whether psychiatric disorders and psychological problems are a cause or a consequence of childhood obesity or whether common factors promote both obesity and psychiatric disturbances in susceptible children and adolescents. A cohesive and strategic approach to tackle this current obesity epidemic is necessary to combat this increasing trend which is compromising the health and well-being of the young generation and seriously impinging on resources and economic costs.
Keywords: pediatric obesity, psychological comorbidity, mental health, ADHD, depression, anxiety, obesity stigma, teasing, bullying
Childhood obesity is one of the most serious public health challenges of the 21st century. Over 42 million children <5 years worldwide are estimated to be overweight (OW) or obese (OB).1,2 OW and obesity (OBy), an established problem in high-income countries, is also an increasing problem in low- to middle-income countries (Table 1). More alarmingly, the increasing rate of childhood OW and OBy in developing countries is now >30% higher than that in developed countries. If current trends continue, then an estimated 70 million children will be OW or OB by 2025, making this a leading health problem.2
Table 1 Global incidence of overweight and obesity in childhood
Abbreviations: OECD, Organization for Economic Cooperation and Development; WHO, World Health Organization.
Childhood and adolescent OBy has far-reaching and enduring adverse consequences for health outcomes.3,4 In particular, the onset of psychiatric and psychological symptoms and disorders is more prevalent in OB children and young adults. Research has confirmed an association between childhood OW and OBy, psychiatric and psychological disorders, and onward detrimental effects on the psychosocial domain5–7 and overall quality of life (QoL).8,9 In turn, these can also compound their physical and medical health outcomes.3,4 Emerging research might strengthen the current body of knowledge in this area. Further review is required to explore the extent and implications of psychological comorbidities as well as identify important gaps for future research.
This review focuses on psychiatric, psychological, and psychosocial consequences of childhood OBy. It is the most recent review of this type and includes a broad range of studies involving numerous countries with varying methodologies. The aim was to establish what has recently changed in relation to the common psychological consequences associated with childhood OBy.
Data sources and searches
Three databases were searched, including MEDLINE (PubMed), Web of Science, and Cochrane Library. Search terms were developed with input from an subject expert librarian (Table 2). The search terms and strategy attempted to capture new information not included in previous reviews, including both prevention and treatment options, and findings from multiple countries. The full search was undertaken by one reviewer (JR). Then, another reviewer (LM) independently examined the titles and abstracts to identify suitable publications matching the selection criteria. Later, full texts were obtained for relevant articles and examined for inclusion in the final collection of review literature.
Table 2 Complete list of search terms
All publications presenting information on the identification or prevention of psychiatric morbidity in childhood obesity were included. Articles for review were excluded if published before 2006, were unavailable in English, focused on medical/physiological outcomes or on obesity in adulthood (the cutoff age for adulthood varied and was determined by the authors of individual papers).
Preliminary search results
Databases were searched between June 13 and 17, 2016. Initial search results are presented in Figure 1. Of 53 studies, 16 explored depression and anxiety, 17 investigated attention-deficit/hyperactivity disorder (ADHD) and conduct disorders (of which one also explored depression and anxiety), and 30 focused on other psychological comorbidities (of which 9 also included depression, anxiety, and/or ADHD).
Figure 1 PRISMA flow diagram of search results.
Abbreviation: PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses.
The reviewed 53 studies are summarized in Tables 3–5 and are presented narratively below in relation to: 1) depression and anxiety, 2) ADHD, and 3) other psychological comorbidities including self-esteem, QoL, stigmatization, and eating disorders. Abbreviations for all outcome measures are detailed in Table 6.
Table 3 Summary of depression and anxiety papers (by authors in alphabetical order) (n=16)
Note: Refer to Table 6 for abbreviations and outcome measures.
Table 4 Summary of ADHD papers included in the review (by authors in alphabetical order) (n=17)
Table 5 Summary of papers included in the review related to self-esteem, HRQoL, conduct, stigmatization, and eating disorders (by authors in alphabetical order) (n = 30)
Depression and anxiety
Previous research findings about the relationship between depression and childhood OW/OBy suggest that weight gain during adolescence may be related to depression, negative mood states, and poor self-esteem.7,10
In relation to depression and anxiety, Table 3 summarizes 16 studies that are currently reviewed. Diagnosis for depression and anxiety was confirmed either through diagnostic or clinical interview in 9 studies5,11–18 or through specifically focused validated questionnaires in 7 studies.19–25 Body mass index (BMI) was obtained through direct measurement, from documentation/clinical records or self-report, and body weight status was determined using national and international reference data and cutoff points criteria.5,11–25 Study designs included prospective longitudinal,13,14,18,20,23 cross-sectional,15,16,19,21,22 population-based,25 cohort,24 clinical cohort,11,12 and retrospective studies.5,17
Numerous studies continue to report an association between depression and childhood OBy.14–16,21,22,26 Anxiety disorders and stress associated with childhood OW/OBy are less well documented.14,16,24 To date, related research studies have reported mixed findings.
Study findings varied in relation to the strength of association between depression and childhood OBy.11,15–17,19,21 OW/OB children, compared with normal weight children, were found to be significantly more likely to experience depression as diagnosed by medical interview,15,16 with evidence that increasing weight in children was associated with increasing levels of psychosocial distress which is significantly correlated with depression, diagnosed by self-reported questionnaire.21 Other studies of childhood OW/OBy did not support these findings and reported the prevalence of depression (medical diagnosis) being only modestly greater than the general population,11 or having a weak association, as assessed by Child Depression Inventory (CDI) questionnaire.19 In OB children, no statistically significant difference was found in the rates of most common psychiatric disorders including medical diagnosed depression.5
Only a small number of studies have reported sex differences in OW/OB children/adolescents in relation to depression/anxiety.14,21,22 OW/OB girls were reported to have a significantly greater increase in depression than OW/OB boys,21 with greater odds of developing depression and anxiety with increasing weight.14 OB girls also demonstrated more social anxiety than OB boys.24 In contrast, OW/OB boys were found to be at higher odds of depressive symptoms than boys of normal weight.22
Other relevant findings of interest relate to the older OB child (12–14 years) having an increased chance of developing depression and other internalizing disorders such as anxiety and paranoia.17 Children also reporting stress on several levels have a significantly higher odds for becoming OB.23
Findings from studies suggest greater psychopathology among OW/OB adolescents than non-OB adolescents.11,25,27 OB children/adolescents are at more risk of diagnosed mood disorder in adulthood,13 with OW/OB children and adolescents seeking psychiatric treatment and being diagnosed with depression5 and diagnosed bipolar disorders.5,11 OW/OB children/adolescents have been commonly reported to cope with an increased psychiatric burden11 and, when psychologically unhealthy, also more likely to report thoughts and attempts of suicide.25
Family situations and influences also need to be considered while considering risk factors for childhood OBy and/or developing psychological disorders.12,23 Maternal mental health disorders predisposed OB children to a higher significant risk of anxiety,12 and increased psychological and psychosocial stress in families may be a contributing factor for childhood OBy.23
ADHD is one of the most common childhood psychiatric disorders and is estimated to affect between 5% and 10% of young schoolchildren worldwide.28 In relation to ADHD and childhood OBy, Table 4 summarizes 17 studies that are currently reviewed. Study designs included longitudinal,29–32 cross-sectional,33–37 cohort,38–41 retrospective documentary analysis,5,42,43 and secondary analysis.44
ADHD diagnosis was confirmed through diagnostic/clinical interview in 11 studies5,29,31,33,34,37–39,41–43 and through ADHD-focused checklists and scales in 6 studies.30,32,35,36,40,44 Self-reporting was recognized to be a limitation in 1 study.40 Body weight status was determined using either national5,31,33,35,38,41–44 or international reference data and cutoff points criteria.29,30,32,36,37,39
Numerous studies have reported associations between ADHD and childhood OBy.14,30–32,35,37 The strength of association between ADHD and childhood OBy varies across research studies. When compared to the general population, only 2 studies reported a significant association between OBy and ADHD symptoms with children/adolescents as assessed by clinical diagnosis35,43 and CPRS.33 Other studies have reported an increased incidence of OB children with ADHD,36 increased risk of becoming OB,29,30,32 and increased odds of children with ADHD becoming OW when not using ADHD medication.37
Children with ADHD and children displaying childhood conduct problems such as disobedience, defiance, aggression, cruelty to others, and destruction of property were prospectively associated with OW/OB young adults.30,31 These behaviors in early childhood were also predictive of disproportionate increase in BMI by early adolescence30 or early adulthood.31
In contrast, a lower incidence of OW/OBy was noted in children with ADHD treatment34 while other studies did not find any association between ADHD and OW/OBy.5,40,42,45 Young OB adolescents are also reported to have lower rates of ADHD (self-reported) compared with healthy and underweight (UW) groups,40 and children diagnosed with ADHD were more likely to be normal-weight or UW than OB.5
Other psychological comorbidities
In relation to other psychological morbidities, Table 5 summarizes 30 studies currently that are reviewed. Study designs included prospective longitudinal,20,31,32,46–48 cross-sectional,15,16,21,49–54 cohort,24,55–63 and retrospective cohort/documentary analysis.5,17,64–66
Diagnosis of related psychological comorbidities was confirmed either through diagnostic or clinical interview in 6 studies5,15–17,53,64 or through specifically focused questionnaires in 24 studies.20,21,24,31,32,46–52,54–63,65,66 All the studies obtained BMI data and determined weight status using national and international reference data and cutoff points criteria.
Study findings confirmed that OW/OB children had significantly lower self-esteem than normal-weight peers, as measured by various focused questionnaires.21,49,54 Findings confirmed that a clear negative impact on self-esteem was associated with OW/OB children49,54 who were more likely to have an increased child body dissatisfaction21,54 and lower perceived self-worth and self-competence than normal-weight peers.49
Findings are mixed in relation to gender issues.20,49 OB girls completing a self-perception profile, compared with OB boys, had significantly more negative perceptions of their physical appearance, self-worth, and how they felt they were accepted by social groups, including their peers.49 In contrast, no sex differences were found between psychological factors and weight problems with both sexes reporting the association with low self-esteem and OBy.20 Self-esteem of OB children also appears to decrease with age with older children reporting significant reduction in self-esteem related to physical appearance than younger children.21,67 It is interesting to note that parenting is not associated with child body dissatisfaction but parental responsiveness to OW/OBy is positively associated with child self-esteem.54
Health-related quality of life (HRQoL)
In research studies, childhood OBy is consistently associated with a poorer HRQoL when compared with lower-weight children.24,47,48,51,55,62,63,66 The findings for HRQoL tended to be consistent across the studies for both boys and girls. However, sex differences were noted in a study with OB treatment seeking patients with females reporting poorer HRQoL,62 and females also reported lower HRQoL compared with males and healthy-weight females.55 Severely OB children also reported depressive symptomology in the clinical range as assessed by Becks Depression Inventory Scale and marked impairments in both generic QoL66 and HRQoL.24,63,66 The association between increasing BMI and lower HRQoL being reported became stronger in later childhood.51
Conduct and stigmatization
OW/OB children were more likely to experience multiple and clinically significant associated psychosocial problems than their healthy-weight peers5,21 with increasing conduct issues/disorders (such as disobedience, disruptive aggressive and destructive behavior, physical and verbal abuse).5,17,31,52 Other issues include peer problems,51,52,60 inattention issues32 along with emotional symptoms.51,60 The association between symptoms and OW/OBy was found to be stronger with increasing age in childhood,51 with increasing weight at younger ages (4–5 years) and associated with peer relationship problems at age 8–9 years.61
Bullying and teasing, manifestations of OB stigma, were stressors associated with negative psychological outcomes and occurred more frequently in OW children.68 Studies reported that persistent intense teasing and bullying experienced from childhood influences psychological complications.15,16,58,59,69 OW/OB adolescents most distressed by weight-related teasing exhibited lower self-esteem56,59 and higher depressive disorders.56,58,59 Primary sources of stigma for children and adolescents were reported to include peers, teachers/educators, parents, and health care providers.58,69–71 OW/OB children being bullied and teased may also have less favorable conduct and poorer school performance, social circumstances, and social involvement when compared with normal-weight children.70 Research findings reported that OW/OB children between 6 and 13 years were 4–8 times more likely to be teased and bullied than normal-weight peers.21 OBy- and weight-related teasing is a significant risk factor for the development of psychosocial problems, including weight-based teasing, social stigmatization/peer rejection,50 and later eating disorders and unhealthy weight-control behaviors.58
There is a clear overlap with OBy and eating disorders in several areas of psychosocial impairment with girls being more vulnerable to comorbid mood and eating problems.72 Research findings revealed that 25% of OB girls used extreme weight-control behaviors such as inducing vomiting, abusing laxatives, diet pills, fasting, or smoking.46 The relationship between OBy and eating behaviors in children/adolescents is evident with OB adolescents clearly at risk of developing a restrictive-eating disorder.64,65 There is a very high prevalence rate of mood disorders and significantly higher lifetime prevalence of bulimia nervosa in weight-loss-seeking patients with childhood OBy onset.64 Studies have reported that OW/OB children and adolescents were more likely to report higher body dissatisfaction,21,54 display extreme dieting behaviour47 and eating disorder symptoms, and clinically significant associated psychosocial problems than healthy-weight peers.21
Prevention and interventions
Available evidence confirms that obesity can be treated effectively in younger children73 and adolescents.74 Multicomponent interventions targeting physical activity and healthy diet could benefit OW/OB children specifically in overall school achievement,73 and family-based intervention with maintenance follow-up can improve psychosocial and physical QoL.74 Systematic attempts to manage and treat OW in the early years and pre-school years are required.47 A key focus on interventions should be on childhood/adolescent mental health, improving knowledge, and implementing high standard of treatment for OW children.75 This needs to involve psychological and social support from families with recommendations about changing lifestyle.23 In children with disruptive behavior disorders, secondary prevention and management strategies should include promoting healthy eating and physical activity to prevent adult OBy.19,44
- Routine screening of children with further comprehensive screening for high-risk populations.
- Specific screening for various interrelated symptoms including OW/OBy, symptoms of impulsive eating behaviors, psychiatric disorders, psychological disturbances, and conduct-related issues.
- Systematic screening for ADHD in OB adolescents with bulimic behaviors.33
Early identification and intervention
- Treating children and female anxiety and depression may be an important effort in the prevention of obesity.14,71
- Physicians, parents, and teachers should be informed of specific comorbidities associated with childhood OBy to target interventions that could enhance well-being.50
Interventions should recognize individual differences in terms of identifying motivating goals for accomplishing weight management.61 Follow-up support is essential to maintain any straying from the short-term effects gained.76
- Family interventions need to focus on parenting/attachment issues, behavioral factors, or self-management interventions to implement healthy lifestyles.57
- Stigma-reduction efforts are needed to improve attitudes toward OBy.
Future research needs well-designed prospective and hypothesis-driven longitudinal studies to further investigate specific areas (with different populations) and psychiatric and psychological outcomes. Appropriate control groups of clinical or nonclinical populations need to be included. Examples of future research in childhood obesity include further investigation of:
- ADHD: 1) causality in the relationship between ADHD and OBy, and psychopathological pathways linking the two conditions; 2) experimental designs to establish cause and effect for BMI and HRQoL;51 3) cause and effect of causal link between bulimic behaviors and ADHD and potential common neurobiological alterations;33 4) OBy risks of young adults who manifest conduct problems in early life.31
- Body image: directional nature of relationships between body image and OBy as well as changes in psychosocial functioning.24
- Family functioning: influencing role and extent of parental, family functioning, peer, educator, or societal-related factors in psychological consequences.12
- Depression: 1) directional nature of sedentary behavior and onset of depression;19,78 2) moderating versus mediating roles of variables such as trait negative effect, depressive and anxiety symptoms, and low self-esteem and their influence on eating pathology.56
- Psychosocial: 1) role of psychosocial factors and treatment interventions that target extremely OB individuals based on their BMI, and socio-demographic profiles; 2) eating patterns and the dynamic relationship between binge eating and BMI.
- Lifestyle: 1) causal relationships between physical activity behavior, motivation to change, BMI change and development of comorbid health conditions;24 2) optimal strategies for encouraging lifestyle change and accomplishing weight management.61,77
The purpose of this review was to focus on research findings related to psychiatric, psychological, and psychosocial consequences of childhood OBy from an international perspective. The precise extent of these complications remains uncertain due to the range of methodological approaches and methods used across studies. Causal mechanisms are not yet fully understood or convincing, but they are likely to involve a complex interplay of biological, psychological, and social factors.
Compared to healthy-weight children and adolescents, there seems to be a consistent heightened risk of psychological comorbidities including depression, compromised perceived QoL, depression and anxiety, self-esteem, and behavioral disorders. In turn, these disorders associated with OBy have a consistent adverse impact on their perceived HRQoL and psychiatric, psychological, and psychosocial disorders. These can be enduring in nature and may continue into adult life with the potential for lifelong health problems.
In general, consistent findings have established that childhood OW/OBy was negatively associated with psychological comorbidities, such as depression, poorer perceived HRQoL, emotional and behavioral disorders, and self-esteem during childhood. Findings are similar to other reviews in this period3,28,45,72,79–82 in that OW/OB children and adolescents were more likely to experience psychological problems than healthy-weight peers. Findings suggest a shared link between depression and obesity such that OBy increases the risk of depression in adult life, but also that depression predicts the development of obesity.26
Evidence related to the psychiatric disorder, ADHD, remains unconvincing because of various findings from studies. Many studies did report an association between ADHD and elevated weight status.14,30–32,35,37 Children presenting with early and persistent ADHD in early and mid-childhood are also at an increased risk of OBy in adult life.28 Therefore, the child with ADHD may be at risk of becoming OW or the OW child may be at risk for a diagnosis of ADHD. Some studies did not report any association between ADHD and OW/OBy.5,40,42,45 Other reviews also reported that the data were insufficient and inconsistent.3,4
This review found that OW children were more likely to experience multiple associated psychosocial problems than their healthy-weight peers. The strength of association between psychological disorders, psychosocial problems, and OW may also depend upon OBy stigma, teasing, and treatment-seeking children.66,71,82,83 This stigmatization is now a common event within society and may be evidenced in the form of negative stereotypes, victimization, and social marginalization.83 OBy stigma and teasing/bullying are pervasive and can have serious consequences for emotional and physical health. Stigma may be linked to obesity being the target of many public health campaigns that influence young OW/OB children and adolescents to control their weight, often through drastic measures.46,83 This means that psychiatric symptoms or disorders may be a consequence of being OB in a culture that stigmatizes OBy. Alternatively psychiatric disorders may contribute to the development of obesity in vulnerable individuals.84
Intervention and action are necessary to prevent childhood and adolescent OBy.1 Children are particularly vulnerable as both obesity and psychiatric conditions often have their origins during this crucial developmental period.79 If obesity remains in adolescence, then it is likely to persist into adult life.14,85
The aim of this review was to establish what has recently changed in relation to common psychological consequences associated with childhood OBy. Despite extensive research being undertaken over the previous decade, it remains unclear as to whether psychiatric disorders and psychological problems are a cause or a consequence of childhood obesity. The prevalence of both childhood OW/OBy and associated psychiatric and psychological disorders is increasing, and there is an acute heightened awareness of this serious public health issue in the society and health-related policy. However, it is also still not proven whether common factors promote both obesity and psychiatric disturbances in susceptible children and adolescents. This finding in itself reflects the challenge of researching and understanding the complex factors associated with childhood OBy and psychological well-being. This review has illustrated that OW/OB children are more likely to experience the burden of psychiatric and psychological disorders in childhood, adolescence, and possibly into adulthood. A cohesive and strategic approach to tackle the OBy epidemic is necessary to combat this increasing trend which is compromising the health and well-being of the young generation and seriously impinging on resources and economic costs. As a matter of urgency, further focused research is essential to identify the diverse range of mechanisms driving the current increasing trajectory. Reliable and convincing evidence is needed to inform policy, economic regulation interventions, and strategies to prevent OBy from affecting future generations.
LM’s time on this research was funded by UK Medical Research Council core funding as part of the MRC/CSO Social and Public Health Sciences Unit “Social Relationships and Health Improvement” program (MC_UU_12017/11) and “Complexity in Health Improvement” program (MC_UU_12017/14). The authors report no other conflicts of interest in this work.
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