A critique of the English national policy from a social determinants of health perspective using a realist and problem representation approach: the ‘Childhood Obesity: a plan for action’ (2016, 2018, 2019)
BMC Public Health volume 21, Article number: 2284 (2021)
The UK government released Chapter 1 of the ‘Childhood Obesity: a plan for action’ (2016), followed by Chapter 2 (2018) and preliminary Chapter 3 was published for consultation in 2019 (hereon collectively ‘The Policy’). The stated policy aims were to reduce the prevalence of childhood obesity in England, addressing disparities in health by reducing the gap (approximately two-fold) in childhood obesity between those from the most and least deprived areas.
Combining a realist approach with an analysis of policy discourses, we analysed the policies using a social determinants of health (SDH) perspective (focusing on socio-economic inequalities). This novel approach reveals how the framing of policy ‘problems’ leads to particular approaches and interventions.
While recognising a social gradient in relation to obesity measures, we critique obesity problem narratives. The Policy included some upstream, structural approaches (e.g. restrictions in food advertising and the soft-drinks industry levy). However, the focus on downstream individual-level behavioural approaches to reduce calorie intake and increase physical activity does not account for the SDH and the complexity and contestedness of ‘obesity’ and pays insufficient attention to how proposals will help to reduce inequalities. Our findings illustrate that individualising of responsibility to respond to what wider evidence shows is structural inequalities, can perpetuate damaging narratives and lead to ineffective interventions, providing caution to academics, practitioners and policy makers (local and national), of the power of problem representation. Our findings also show that the problem framing in The Policy risks reducing important public health aims to encourage healthy diets and increase opportunities for physical activity (and the physical and mental health benefits of both) for children to weight management with a focus on particular children.
We propose an alternative conceptualisation of the policy ‘problem’, that obesity rates are illustrative of inequality, arguing there needs to be policy focus on the structural and factors that maintain health inequalities, including poverty and food insecurity. We hope that our findings can be used to challenge and strengthen future policy development, leading to more effective action against health inequalities and intervention-generated inequalities in health.
Childhood obesity has been identified as a public health priority in high income countries across the world . In response, countries have developed national and local policies, and have implemented multiple public health interventions, to try and tackle the problem . Taking England as an example, childhood obesity has been identified as a policy priority since 1991 . Jebb and colleagues  described the evolution of policy and actions to tackle obesity in England up to 2013, concluding that rigorous evaluations of effectiveness were rare, and that the limited evidence of tangible success, despite substantial investment of resources, reinforces the magnitude of the challenge to the whole of society. More recently, Theis and White  analysed English government obesity policies using theoretical frameworks and an intensive applied thematic analysis approach. The analysis revealed that National obesity policy proposals rely heavily on individual level behaviour, are repeated with no reference to previous policies, and are proposed with limited guidance on implementation. Croker and colleagues  conducted a mapping study of national policies for pre-school children obesity in England from a behavioural science perspective. They found that much of the policy activity is focussed on education and suggested that upstream policies which act on food systems should be strengthened. Although the importance of the socioeconomic patterning of childhood obesity is acknowledged in these existing analyses of policy, it was not the focus of their analyses.
The recent 2019 Chief Medical Officers report Time to Solve Childhood Obesity  underlines the importance of the social determinants of health in understanding childhood obesity rates. The most recent national policy for tackling childhood obesity in England has been published as chapters, first in 2016 ‘Childhood Obesity: a plan for action’ , followed by ‘Childhood Obesity: a plan for action: Chapter 2’ in 2018 . A preliminary Chapter 3 was opened for consultation in 2019 in the green paper ‘Advancing our health: prevention in the 2020s’ . For convenience the chapters will collectively be referred to in this paper as The Policy. The stated aim of The Policy was to significantly reduce the prevalence of childhood obesity in England, and to address disparities in health by reducing the gap in childhood obesity between those from the most and least deprived areas. Although the creation of a policy addressing childhood obesity was generally welcomed by public health bodies at the time of publication, there is concern that they focus too heavily on individual behaviour change rather than upstream (stealth) interventions [4, 5, 10, 11]. With plans underway for Chapter 3 of The Policy  potentially delayed due to a Government focus on Covid-19, it is our hope that government will revisit and review the aims of The Policy with a focus on the structural influences of health inequalities and poverty on health outcomes.
Childhood obesity and inequalities in England
The relationship between social disadvantage and health is well documented (see for example: [12,13,14,15,16]). There is a social gradient that can be mapped onto childhood obesity data (as measured by Body Mass Index)  with higher prevalence seen in children from areas of higher socio-economic deprivation [17, 18]. This pattern has been evidenced globally . Children living in the most deprived areas in England are twice as likely to measure as ‘obese’ than children in the most affluent groups , and the gap between the most and least deprived is growing with a plateauing of prevalence for the most advantaged .
Social determinants of health
A social determinants of health (SDH) perspective explores how individual experience of health is affected by micro and macro social and political contexts which lead to health inequalities . The Marmot Review  was critical in the development of SDH perspectives designed to shape policy in England which emphasised the importance of the ‘causes of the causes’ of health and health inequalities. The review argues that ‘health is closely linked to the conditions in which people are born, grow, live, work and age and inequities in power, money and resources – the social determinants of health’ (, p5). Early years; education; work; income; and communities were identified as key examples of where the social gradient in health is persistent . Health policy has been critiqued for neglecting structural forces as causal factors in producing social and economic inequalities and health inequalities (e.g. [13, 14, 20]). Even when the social determinants of health are acknowledged in policy and policy networks, structural factors that create and sustain inequalities are often not meaningfully addressed .
Childhood obesity policy context and the social determinants of health
Traditionally, policy discourses around obesity have focused on personal responsibility and individualism, with an absence of engagement with the social determinants of health [20, 21]. Individualistic approaches are evident in the wealth of research examining risk factors for childhood obesity, which focus on implementing changes to lifestyle behaviours  with minimal consideration of the wider social determinants of health. A pattern in approaches to obesity interventions lacking complexity has also been found at a local authority level in England . Existing systematic reviews of the effectiveness of interventions to prevent childhood obesity which focus on health inequalities [23, 24] found that most interventions did not report their results by socio-economic status nor used a social determinants of health approach to intervention development or implementation. There is often little mention of economic, cultural and social issues in relation to obesity and where wider determinants such as socioeconomic status, food insecurity, or education level are mentioned, behavioural and lifestyle modifications are still prioritised [20, 21]. This is despite the UK having one of the highest levels of children living in severely food insecure households in Europe , and evidence that austerity and budget cuts have negatively impacted Local Authority capacity to reduce health inequalities .
The aim of our research was to analyse The Policy using a social determinants of health (SDH) perspective. Our findings can then be used to challenge and strengthen future policy development, leading to more effective action against health inequalities and intervention-generated inequalities in health. The Covid-19 pandemic has further exposed social gradients in health, with those experiencing poverty and disadvantage being hit hardest , and worsening food insecurity . Food bank use has significantly increased; Trussell Trust  reported that food bank use had increased by 74% over the past 5 years, with 1.9 million emergency food supplies delivered to individuals across the UK between April 2019-March 2020, and 700,000 of these parcels went to children. It is critical that consideration is given to these issues in future policy proposals [30, 31]. With plans underway for Chapter 3 of The Policy  potentially delayed due to a Government focus on Covid-19, it is our hope that government will revisit and review the aims of The Policy with a focus on health inequalities and poverty, using a stronger critical structural lens.
We used a novel methodological approach, employing and integrating Pawson and Tilley’s  realistic evaluation with Bacchi’s ‘What’s the Problem Represented to be?’ (WPR) approach [33, 34] to analyse The Policy [7,8,9]. Pawson and Tilley’s  realist approach was used to understand the proposed pathways for reducing inequalities, assessing the inherent ‘programme theories’ within The Policy: what the policy proposes to do and the intended results, and what the (sometimes implied) pathways to said results are, and how success will be measured. These proposed pathways were then assessed based on how embedded they were in the realities of policy implementation and how they take account of external factors on policy processes. Bacchi’s WPR approach  was used to analyse government and external discourses around The Policy, aiming to uncover how policy ‘problems’ are discursively created within policy documents through the way ‘problems’ are represented. This approach asks the researcher to start with policy proposals and reflect on what the proposals imply that ‘the problem’ is (e.g., a proposal to increase training implies a lack of training to be the problem). Importantly, the way policy ‘problems’ are discursively produced can also set the parameters for the discourse that follows [33, 34]. In this way, the WPR tool affords a productive means of identifying and interrogating the power of narratives that may otherwise be taken for granted. Our methodology acknowledges that all policy documents contribute to and are informed by wider narratives which frame proposals and interventions and therefore interrogating said narratives can help to understand their effects. Table 1 provides an overview of the criteria used to extract data from the policy documents.
Data extraction and analysis
The Policy documents were independently double data extracted between October 2019 and May 2020. Researchers with different academic backgrounds extracted and analysed the policies (NG & SMP), to allow broader identification and interpretation, and to enable a more diverse discussion of the findings . We developed a coding framework based on the questions in Table 1, then extracted data from the policy documents using coding software. The two researchers carried out data extraction of policy documents separately, then brought together the extracted data to identify any differences or disagreements through several data extraction and analysis meetings, moderated by a 3rd researcher (FHB). All authors were then given the opportunity to comment on findings and analysis at several stages of the analysis and writing process.
Our findings begin by outlining the key proposals (see supplementary Table S1), the proposed pathways to change from the proposals, the proposed measurements and what they tell us about the policy aims and scope. Then the framing of the ‘problem’ (in Bacchi’s sense [33, 34]) is discussed in depth, drawing from wider evidence to illustrate the framing of the policy ‘problem’ of obesity in the context of wider research that illustrates complexity and contested nature of the topic (see Supplementary Table S2 for examples of ‘problems’ as represented in The Policy). We then discuss the policy’s approach to inequalities, highlighting fundamental gaps in between proposed aims to reduce inequalities in child health and the proposed pathways to do this. Situating the problem representation in The Policy within a context of policy absences and alternative conceptualisations illustrates the effects of problem framing, allowing for the re-imagining of policy approaches to, and discourses around, the public health priority of ‘childhood obesity’ and its relationship with inequalities.
Reviewing the key policy proposals
The Policy outlines that it is a response to the growing prevalence of childhood obesity (as measured by BMI) in England. The Policy states that the rising level of childhood obesity will result in rising obesity levels in adulthood that will cause other associated health problems, increasing chronic disease related to obesity (targeting an anticipated threat). The Policy predicts that this link will result in greater long-term cost to the NHS for obesity related health problems. Morbidities that have been linked to obesity (particularly type 2 diabetes) in adulthood and the link between obesity in childhood and adulthood are given to justify the policy’s pertinence, proposing to reduce the cost to the NHS by reducing the risk of health problems associated with obesity in adulthood through obesity reduction in children. The Policy proposals (Table S1) imply that behaviour change and reduction in obesity and child health inequalities will follow from the proposals.
The key proposals in The Policy suggest that it will tackle obesity through lowering sugar consumption, the reformulation of products and increase physical activity, and (after consultation and publication of Chapter 2) reducing promotion and advertising of unhealthy food and drink. An overview of the key proposals in The Policy (see Table S1) indicate that despite the different system levels that The Policy proposals cover the focus of proposals in on individual behaviour change without adequate engagement with wider determinants. Although the implementation of ‘upstream’ approaches such as the sugar tax and financial support in the case of the Healthy Start Scheme (HSS) are welcomed, The Policy focuses heavily on individual choice and behaviour (particularly of parents). Our findings support those of Chapman et al. (, p.20) that The Policy ‘replicated a wider trend in which only aspirations for individual-level behaviours were articulated with precision.’
Due perhaps to the brevity of the policy documents, how the impact of the policies listed in the proposal will be measured beyond the National Child Measurement Programme (see further discussion below) is unclear. For example, the measurement of mandatory calorie labelling, TV advertising restrictions, and local area changes is not outlined, which makes assessing the pathways to impact difficult. Ofsted are granted responsibility for tracking progress in schools. The ‘Sugar Tax’ is being monitored by industry responses, but it is not clear how directly the impact will be measured in terms of obesity prevalence. There is limited engagement with external influences on impact and implementation of the policy proposals, and its successes, supporting the findings of Theis and White (, p126) that the proposals do ‘not readily lead to implementation’.
What’s the problem represented to be? Defining the ‘childhood obesity’ policy problem
The Policy’s definition of ‘obesity’ focuses on child weight status where the determinants of change are physical activity levels and calorie intake (i.e., calories consumed vs energy expended): ‘at its root obesity is caused by an energy imbalance: taking in more energy through food than we use through activity’ (, p.3). However, the causes of ‘obesity’ (as defined by BMI) are embedded in an extremely complex biological system that interact with cultural, structural and economic contextual factors, none of which exist in isolation . Systemic factors such as money, power and resources are necessary for understanding the social gradient seen in obesity data . The focus of energy balance at an individual level does not acknowledge the complex and contested nature of causes, its contested relationship to health, and how ‘obesity’ is defined and measured, within wider public health research (see for example, [39,40,41,42]). Therefore, explanations of BMI data which rely on individual energy imbalance must be challenged.
A narrow definition of obesity is also reflected in the key measure highlighted in the policy documents being the National Child Measurement Programme (NCMP) which is based on BMI (body mass index). Measures which rely on BMI (designed for use in adults), and the NCMP in particular [41,42,43], have been criticised for simplicity and for generalising a relationship between weight and health (see for example [44, 45]). Such a measure implies a definition of obesity which is not about the presence of illness or health problems, instead categorising individuals as overweight or obese based simply on height and weight [41, 44]. BMI is not a measure of overall health and thus the limitations of BMI (and any such screening method) and its complex association with health needs to be acknowledged. The tracking of childhood obesity as measured by BMI into adulthood (stated as a reason for the need to tackle childhood obesity) is also not clear cut. Increased likelihood of obesity in adulthood is apparent in those with obesity in childhood and adolescence; however, a high proportion (70%) of adults that fall into the obesity category did not in childhood or adolescence . Evidence has suggested an association between childhood obesity (as measured by BMI) and later adult morbidity (e.g cardiovascular disease and metabolic health risks); however, this is far from conclusive, and the nature of the relationship is unclear [47, 48]. The combining of, and interchangeable use of, ‘obesity’ and ‘overweight’ in the policy also paints a misleading picture as morbidity correlation and risk differs between the categories. Where complexity and contextual factors are absent in policy proposals and the measurement of policy outcomes, it is implied that they are not relevant to understanding the policy ‘problem’.
The effects of problem framing
Obesity is framed as an avoidable financial cost to health services in The Policy which perpetuates a ‘burden’ narrative . It is worth recognising that individuals (the general public) have little control over how resources are distributed and budgets allocated within health systems. Difficult decisions on where to invest in public health often need to be made, especially where resources are scarce, and preference can swing to the treatment of ‘identifiable victims’ rather than investment in long-term prevention activities . There is also a notable absence of the impact of austerity on health budgets and spending and child health inequalities in the policy documents, even when referring to inequalities and poverty, despite links made between poverty and childhood obesity. The absence of the impact of austerity on NHS and local public health budgets in The Policy purports a narrative that focuses on individual responsibility rather than a service provision issue (i.e. those that require healthcare are a ‘burden’ on limited resources rather than that there is a resourcing issue that is negatively impacting individuals requiring healthcare). Focussing on the individual (or parents) as responsible for making changes to childhood obesity levels contributes to a narrative of blame  that does not account for structural inequalities and social determinants of health beyond individual control . Individual blame narratives, then, work to further justify a focus on individual level behaviour change in policy rather than a focus on the SDH which can explain the gradient in BMI population data relative to socio-economic deprivation.
Stigma was given as a reason for the need for a childhood obesity policy, as children deemed overweight or obese are likely to experience ‘bullying, stigmatization and low self-esteem' ( p6). However, as there was no targeted response to stigma itself. In reviewing the literature, the attention paid to stigma is necessary. The physical and psychological harms caused by stigma, and the negative impact that stigma has on quality of healthcare have been evidenced . Not only is stigma likely to impact an individual’s health and wellbeing, stigma and misinformation about ‘obesity’ also cause barriers to appropriate and timely treatment of many health concerns, not just those that have been linked to weight status [51, 52]. Pont et al.  explain that stigma is purported by some as a way to motivate individual weight loss, to tackle the ‘problem’ of obesity; an approach which overlooks the complexity of understanding individual BMI (overstating the control individuals have over it), the contested nature of the links between ‘obesity’ and negative health outcomes, and the negative health outcomes that result from stigma. Interventions which promote stigmatizing messages are likely to have the lowest compliance, whereas interventions which make no reference to obesity at all have been found to be most effective in encouraging health promoting behaviours . By framing stigma as the result of obesity, rather than a problem to challenge, The Policy narratively supports individual behaviour change and responsibility, rather than addressing the wider determinants that are necessary to understand the social gradient seen in BMI data and the negative impacts of weight stigma.
Individualising and oversimplifying discourses and evidence around obesity are common within policies and policy networks and perpetuate narratives of individual blame and responsibility for one’s own health status [21, 54]. Stigmatizing policy narratives can detract from structural factors within the SDH which account for many adverse health outcomes and health inequalities that have been linked to obesity , which is particularly concerning in the context of policy focussed on children. How obesity is discussed at policy level is critical for public understanding of the topic , therefore attention must be paid to the effects of policy narratives and how they can perpetuate stigma.
The policy and health inequalities
We found several gaps between the proposals in The Policy and anticipated outcomes proposed. The fundamental gap identified is that inequality is referred to in the introduction as a crucial element and the conclusion of the policy states that inequality will be reduced as a result of the implementation of the policy and that support is needed for ‘those who need it most’ (, p7). However, how this will be achieved in practice is left unclear. Black and minority ethnic families are identified as more likely to be affected by obesity but no explanation for why or how such groups will be affected by the plans is given. Local authorities are encouraged to focus on health inequality, but specific guidance (and support) is unclear. For example, there is recognition of need for greenspace and inequality in access to greenspace, but The Policy does not say how it will address this.
Another gap is related to mandatory action or legislation aimed at the early years, a key life stage for understanding the impacts of the SDH and therefore interventions to reduce health inequalities [13, 14]. The Policy presents statistics on the prevalence of obesity of children aged 5 years and suggests ‘…helping to improve the health of our children and give future generations the best possible start in life.’ (, p.4). The reference to early years consists of voluntary food and physical activity guidelines  and suggests research is undertaken exploring curriculum development that supports good physical development in the early years, but with no details on the research or proposed timescales . Although there is engagement with early years in the proposed Chapter 3 , there is no reference to inequalities.
Inequalities and healthy food ‘choices’
The Policy has a focus on making healthier food choices without consideration of food insecurity, food bank use and poverty. The Policy proposes ideas around ‘choice’ and ‘informed decisions’, for example ‘I want to see parents empowered to make informed decisions about the food they are buying for their families when eating out.’ ( p.5). However, it lacks consideration of the accessibility of a balanced diet due to: affordability of food, practical considerations on physical cooking equipment and energy costs of preparing and cooking food, skipping meals, needing to use food banks [31, 55] or availability of healthy food options where they live .
Food insecurity is associated with poorer diets among children , due to limited access to sufficient, varied and healthy foods . Despite this association, there is only one instance where The Policy demonstrate an awareness that healthy food is not accessible to all, through a commitment to continue investment in the Healthy Start Scheme. HSS provides pregnant women and families with children under the age of four on low incomes vouchers for milk, fruit, vegetables and vitamins . However, the value of HSS vouchers have remained the same since introduction in 2009 (£3.10 per voucher), despite increasing food prices [59,60,61]. There is minimal emphasis on the HSS in The Policy, evidence of poor implementation of the HSS, and a lack of presence of HSS in the preliminary Chapter 3 of The Policy . A 30% decrease in families eligible for the HSS between 2011 and 2018  and recent uptake data demonstrating that less than half of eligible families registered and received HSS vouchers in England  bringing the scheme’s effectiveness into question. Reasons for the decline may be due to lack of awareness about the scheme and difficulties with the application process [30, 61].
The Policy proposes making healthier choices easier by providing nutritional information through front-of-pack food labelling, implying the ‘problem’ is a lack of information when making food purchasing choices. However, such approaches have the potential to widen health inequalities due to the high level of agency involved . Greater use of UK front-of-pack food labelling by those from more affluent backgrounds, compared with those from disadvantaged backgrounds, is acknowledged . Also, evidence of the effectiveness of front-of-pack labelling is mainly generated using simulated conditions and does not consider financial aspects of purchasing behaviour: a strong driver for those experiencing food and time poverty .
Physical activity and inequalities
In 2019, 24% of children from less affluent backgrounds were classified as physically inactive, in comparison with 12% of children from more affluent backgrounds , trends that have been consistently reported since 2015 . The physical activity proposals in The Policy centre around advice to schools and funding for cycling and walking initiatives. However, The Policy lacks engagement with wider determinants of active travel including environmental constraints, distance from school, and time poverty [68,69,70] and unmeasured factors found to be associated with cycling including home and social arrangements that facilitate cycling and owning a bike . The proposals do not demonstrate how they are going to target children from less affluent backgrounds to increase physical activity and reduce these inequalities.
In Chapter 2 the money generated by the sugar levy was reported as lower than expected as soft drink manufacturers reformulated products to avoid it. Though a sign of success of the policy, a consequence of this reformulation means less money generated for investment in public health programmes (the PE and sport premium) than was originally estimated, which is not addressed in Chapter 2 or the proposed Chapter 3 [7,8,9]. The extent to which the premium will support all children, and reduce inequality, through increasing physical activity in school is then brought into question. Questions have been raised about the consistency and accountability of the PE and sport premium in schools, with some aspects of funding lacking clarity about how it will be distributed . As the premium is another initiative that is not targeted based on need, the initiative is unlikely to address inequalities in access to physical activity.
The Policy, described by government as ‘world-leading’ and the first of its kind for children, repeats many of the mistakes of obesity policies that have been shown to be either ineffective or even have adverse effects. The overall problem framing of ‘obesity’ risks reducing the important public health aims to encourage healthy diets and increase opportunities for physical activity (and the physical and mental health benefits of both) for children to weight management, with a focus on particular children, to damaging effect. We have highlighted that individualising of responsibility to respond to systemic factors and structural inequalities may perpetuate damaging narratives and lead to ineffective interventions and ineffective individual treatment. The damaging effects of stigma should not be overlooked, recognising the barriers caused by stigma to opportunities to health promoting behaviours, to positive health outcomes, and to timely and appropriate treatment of health problems. Therefore, careful consideration of the framing of ‘obesity’ is needed from researchers, policy makers (national and local), and public health practitioners as the public health priority of childhood obesity continues to develop and implementation of The Policy continues to unfold.
Our approach asked, ‘can the problem be conceptualized differently?’ . From our findings we propose an alternative conceptualisation that obesity rates are illustrative of inequality, as shown by the social gradient, with BMI trends at a population level highlighted in the policy illustrating this. Therefore, rather than ‘obesity’ being the ‘problem’, which we have demonstrated as complex and contested in relation to definition and relationship to health outcomes, we propose that the ‘problem’ to be addressed is inequality. For Chaufan et al. , policies that seriously consider the relationship between childhood obesity and socioeconomic inequality, including making poverty and the wider social determinants of health central to their proposals, offer the greatest potential to promote better child health and reduce obesity inequalities. Given the complex and contested relationship between ‘obesity’ and health, it stands that articulating the target policy ‘problem’ as inequality itself (for example, the health gap and access to healthy food and physical activity opportunities) will be more effective in improving health outcomes for all children.
We therefore support a focus on structural inequalities and the social determinants of health (including food security, poverty and environment), rebalancing responsibility away from the individual. The government must work to remove barriers to healthy eating and physical activity particularly those most impacted by health inequalities, regardless of weight, for healthier outcomes for all. Policies must demonstrate how they will tackle inequality and ensure that what is proposed will not widen inequalities through effective engagement with the evidence of the SDH.
Availability of data and materials
The qualitative data extracted and analysed during the current study is not publicly available but can be discussed or made available from the corresponding author on reasonable request. All documents analysed are publically available and referenced in this article.
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We thank Dr Iain Lindsey for helpful and supportive discussions in the development of this research project.
This study is funded by the National Institute for Health Research (NIHR) School for Public Health Research (Grant Reference Number PD-SPH-2015). The views expressed are those of the author(s) and not necessarily those of the NIHR or the Department of Health and Social Care. The NIHR School for Public Health Research is a partnership between the Universities of Sheffield; Bristol; Cambridge; Imperial; and University College London; The London School for Hygiene and Tropical Medicine (LSHTM); LiLaC – a collaboration between the Universities of Liverpool and Lancaster; and Fuse - The Centre for Translational Research in Public Health a collaboration between Newcastle, Durham, Northumbria, Sunderland and Teesside Universities.
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Griffin, N., Phillips, S.M., Hillier-Brown, F. et al. A critique of the English national policy from a social determinants of health perspective using a realist and problem representation approach: the ‘Childhood Obesity: a plan for action’ (2016, 2018, 2019). BMC Public Health 21, 2284 (2021). https://doi.org/10.1186/s12889-021-12364-6