An ACEs Life Course Health Development Framework to Guide Prevention and Mitigation

Abstract

Prevention of Adverse Childhood Experiences (ACEs) and mitigation of their impacts on lifelong health and wellbeing are public health priorities. Current prevention and mitigation efforts lack a comprehensive, actionable and widely adopted conceptual framework to guide research, policy and practice. To address this shortcoming we propose an ACEs Life Course Health Development (ACEs LCHD) framework that integrates Bronfenbrenner’s Bioecological Model, the Family Stress Model, the Stress Continuum and other relational development theories.

A life course framework is especially pertinent because it explains and specifies mechanisms linking early life adversity and later life physical and mental health challenges. It incorporates intergenerational and historic cultural factors including parents’ own life histories that can play a powerful role in either perpetuating and compounding or resisting adversity. It demonstrates how ACEs occur in the context of developmental ecosystems – multi-layered family, community and societal milieu in which children live, learn, play and grow. Strengths and vulnerabilities in each level of these ecosystems across the life course can either buffer or amplify the effects of adversity.

Unlike previous ACEs or trauma informed frameworks, the ACEs LCHD framework unites developmental timing, intergenerational influences and ecological context within one integrative systems approach. It points to four action-step priorities: (1) Create developmental ecosystems maps and apply a complex systems science approach to their analysis; (2) Address root causes and mitigate the impact of ACEs on health development trajectories; (3) Identify and act on leverage points; and (4) Enable collaborative action. Child health providers cannot do all this alone but can contribute to local cross-sector coalitions to co-develop interdisciplinary multi-level action, advocate for trauma informed practice and connect children and families to evidence-based interventions to prevent and mitigate ACEs.

Introduction

Adverse Childhood Experiences (ACEs) have wide-ranging potential to negatively impact health outcomes across the life course.¹ Risks of obesity, diabetes, heart disease, liver disease, depression, substance use and ultimately mortality increase in a stepwise fashion with increasing numbers of ACEs.² ACEs investigated in the 1998 landmark Kaiser study comprise physical, emotional or sexual abuse; physical or emotional neglect; problematic parental substance misuse; parental mental illness; parental separation or divorce; intimate partner violence; and an incarcerated household member.^3,4 Additional forms of adversity have since been highlighted in the literature as probable or potential ACEs including the death of a parent, peer victimization, isolation, community violence and low socioeconomic status (SES).^5,6

Despite the explanatory power of ACEs for health conditions and outcomes the field lacks a coherent and actionable conceptual framework to explain how ACEs develop, interact and exert immediate and long-term developmental impacts. Such a framework is needed to guide the design and implementation of prevention and intervention strategies capable of altering children’s health development trajectories. In the absence of such a framework providers and stakeholders from different disciplines work from multiple conceptual models that are difficult to translate into coordinated action. Furthermore, existing ACEs frameworks often fail to account for the complex realities of children’s family, community and social environments in which ACEs operate and exert their impacts.

This paper proposes such a framework: the Adverse Childhood Experiences Life Course Health Development (ACEs LCHD) Framework. It draws on the Life Course Health Development (LCHD) approach, integrating several multidisciplinary frameworks into one developmental systems framework.

This ACEs LCHD Framework (see Figure 1) aims to:

Figure 1:

ACEs LCHD Framework.

Note: Adverse Childhood Experiences (ACEs) are in turquoise and Positive Childhood Experiences (PCEs) are in light green.

1. Depict how ACEs develop within the dynamic context of a child’s intergenerational, multi-level relational developmental ecosystem.

2. Demonstrate how ACEs influence developmental processes, pathways and capabilities that shape health trajectories across the life course.

3. Stimulate developmental ecosystem mapping to guide multi-level action among researchers, policymakers, clinicians and public health practitioners in partnership with families and communities.

4. Highlight the need for collaborative cross-sector action to prevent and mitigate ACEs.

ACEs LCHD Framework Foundational Elements

The ACEs LCHD Framework integrates life course health development⁷ concepts of the Family Stress Model,⁸ Bronfenbrenner’s bioecological model,⁹ the Stress Continuum¹⁰ and relational development theories¹¹ all of which have high explanatory value for ACEs.

The framework illustrates that it is not only the nature of the adversity but its timing relative to a child’s stage of development and the characteristics of the family, community and societal ecosystem that determine how adversity arises, what impact it will have and how to intervene effectively.

The Life Course Health Development (LCHD) approach⁷ suggests that health emerges from multiple determinants operating in nested genetic, epigenetic, biological, behavioral, social, economic and policy contexts that change over time and as individuals develop. Health is not static but an adaptive process composed of multiple continuous transactions between these contexts and each person’s biobehavioural regulatory systems.

The LCHD approach demonstrates that ACEs can shape a person’s health development throughout life and across generations. It helps to explain the genesis of ACEs within intergenerational family dynamics and the social and structural determinants of health as well as historic and cultural factors which can either compound adversity or build resilience. Recognizing that health development continues across the life course reveals multiple opportunities for action - but these interventions must be anchored in principles of human development. Early adversity may disrupt the acquisition of developmental capabilities; healing requires re-engaging or re-learning capacities ‘missed’ earlier in life e.g., communication, emotional regulation and healthy and secure attachment relationships.

Health development in early childhood is not simply a starting point that can be altered later. Instead it is a confluence of intertwined and interdependent developmental processes that strongly influence adult health and well-being. Because early conditioning is harder to alter later, there is an imperative to act early. Strategies to prevent ACEs can and should begin before birth and ideally even before conception by optimizing conditions for future parents and caregivers. While pregnancy and the perinatal period are times of heightened vulnerability and sensitivity, they also offer windows for multi-level prevention and mitigation with parents highly motivated during this period to make changes.^12,13

Family Stress

Stressors faced by families can significantly impact parental functioning contributing to the development of ACEs and to the family’s limited capacity to respond to them.¹⁴ Families with young children may lack extended family or community support and frequently face economic strain, unstable housing and difficulty meeting basic needs. Ironically, when children need the most care parents are often most time- and resource-constrained - a core mismatch that represents a root cause of suboptimal health development trajectories.

Economic strains are frequently compounded by geographic and structural barriers beyond families’ control e.g., lack of public transport, limited health care access or scarce local employment opportunities. These compounding stressors can fuel parental emotional distress which increases risk of parental depression, anxiety and family conflict. They can also negatively impact parent-child interactions, increase risks for ‘internalizing’ responses such as depression or anxiety or ‘externalizing’ disorders including behavioral aggression or rule-breaking.¹⁵ Prolonged stress can recalibrate a child’s developing neurobiological systems with potential lifelong impacts on health and social functioning.^16-18

Effective responses to family stress and childhood adversity must move beyond ‘top down’ professionally designed interventions focused solely on the parent and child which are often based on an incomplete understanding of the family’s circumstances. Working with families to recognize, understand and address stressors within their own ecosystems can open new avenues for multi-level interventions.

Bronfenbrenner’s Bioecological Model

Existing ACEs frameworks often under appreciate the broader social and societal contexts in which ACEs occur and have their impacts. Bronfenbrenner’s Bioecological Model of Human Development helps visualize and categorize the multiple layers of the ACEs LCHD Framework (see Figure 2). In the outermost layer macro-level factors include socio-economic, cultural and environmental factors e.g., health care, education, social services and economic systems that impact meso-level factors e.g., neighborhood safety, community cohesion, workplace well-being and school quality. These in turn impact micro-level family factors e.g., family stress and parent relationships that impact the child’s well-being and increase the risk of ACEs. Macro and meso-level factors interact within and across levels influencing how external stressors are experienced by individuals and families. At the micro level interactions with the child’s unique genetic, epigenetic and biological characteristics shape their developmental trajectories over time, influencing health and social outcomes.

Figure 2:

Ecological Impacts on Family and Child.^11,30

Serious societal ills, such as social isolation, lack of a cultural connection or sense of belonging can act across these layers with devastating impact on children’s development potential. Intergenerational cycles of adversity can be challenging to break and require thoughtful understanding of historic events and experiences.¹⁹ Historic adversities that have impacted whole population groups such as displacement from one’s homeland, experiences of armed conflict and famine can extend the reach of community adversity across generations. Persistent structural inequities continue to influence biology, behavior and choices, perpetuating health challenges.^20-29

Toxic Stress and the Stress Continuum

Stress occurs on a continuum from positive to tolerable to problematic or toxic stress. Some children exhibit resilience while others experience ‘toxic stress’ that gets ‘under the skin’, increasing allostatic load and permanently altering future reactivity to stressors. Warm, nurturing early relationships offer some protection but individual children still show different levels of resistance to childhood adversity even when developmental relationship experiences are similar.^31,32 This may reflect intrinsic differences in genetic predisposition or differences in epigenetic profiles informed not just by the experiences of parent and child but by trauma and adversity experienced intergenerationally. Clinically, some children appear genetically and epigenetically primed to be more vulnerable to stressors than others.

We cannot avoid all stress and dealing with stress is an important part of normal development. However continuous, insidious and toxic stress, especially in the early years, threatens health development. The ACEs LCHD Framework places toxic stress at the center, linking the biological embedding of adversity to ecological and relational context. Both ‘stressors’ and ‘protectors’ operate through the family environment and exert their influences most powerfully through the way families function. While the number and type of ACEs are important, so too are the quality of multiple interactions in the child’s caregiving environment.³³ In other words, ACEs develop and act within each child’s relational developmental ecosystem.

Individual developmental differences may help to explain variations in how stress is ‘transduced’ into impacts on different body systems. For some, stress may primarily impact neurodevelopment, while in others it leads to inflammation or changes in metabolism (or, in some, all three). Stress can affect the developing brain by interfering with normal affiliation and attachment capacities, it can affect the prefrontal cortex and the capacity for executive function and impulsivity, as well as the Hypothalamic-Pituitary-Adrenal (HPA) axis regulating a wide array of neuroendocrine processes.³⁴ Toxic stress can impact how the amygdala is wired and functions (the alarm clock in the brain) as well as the hippocampus (the memory and filing cabinet).³⁴

Two individuals experiencing similar ACEs may have divergent neurobiological responses with detrimental impacts on different organ systems, leading to different patterns of adult disease. Similarly, individuals with comparable exposures to adversity may express resilience in different ways. Much can be learned from studying these patterns of resilience and determining how to promote them. Ideally interventions will be tailored to each individual’s neurobiological response and designed to optimize or ‘re-wire’ their capacity to withstand stressful events and experiences.^35,36

Relationships

The formation of nurturing relationships is a determining factor for health and social outcomes.³⁷ Parent-child interactions, especially early ‘serve and return’ exchanges, shape development.^30,38

Attachment theory underscores the importance of high quality, secure, healthy and responsive relationships with the primary caregiver.³⁹ Safe, Stable and Nurturing Relationships (SSNRs) between infants and their caregivers regulate the body’s stress systems and can act as an adversity buffer. This type of emotional regulation or co-regulation is foundational for infant mental health and for future healthy social and emotional development, including having the ability to work with others for mutual benefit across the life course.^38,40-42 Figure 3 illustrates relational development. As children mature their relational network expands with extended family, peers, schoolteachers, coaches and other adults. Increasingly, some of these relationships are via digital connections.^11,30 Navigating these changing relationships can be especially challenging for children who missed out on a secure relational foundation. However, these later relationships can be strongly protective when accompanied by supports to acquire needed relational capabilities.

Figure 3:

Life Course relationships and interactions.

The ACEs LCHD Framework

The ACEs LCHD Framework provides a dynamic relational model that can reveal root causes of ACEs, illustrate how ACEs impact health development trajectories over time and identify ‘leverage’ or ‘pivot points’ where interventions can have most impact. The framework also helps to highlight critical developmental capacities required to optimize health trajectories and equally helps to identify when something may have been developmentally missed or gotten off track in the early stages of life. It emphasizes the critical importance of the need to readdress ‘the work’ of that developmental stage. The framework can guide strategic interventions based on the principles of human development most likely to improve children’s health trajectories across the life course.⁴³

The framework further highlights the importance of developmental ’mismatches’. Children who experience multiple ACEs risk entering adulthood with heightened sensitivity to stress, less adaptive responses and reduced coping abilities. Behaviors that may have in some way ‘made sense’ as a child or adolescent have in fact placed them on a risky health trajectory. These behaviors can result in poor nutrition, lack of exercise, substance use and abuse, excessive psychological reactions to stress and insecure relationships. Often these habitual behaviors must then be ‘un-learned’ or replaced with new and more adaptive responses. Well-designed trauma-informed interventions offer multiple opportunities to increase each person’s potential to become a healthy flourishing individual.³

Perspectives and Implications

While the ACEs LCHD Framework offers a comprehensive approach to understanding the genesis, impact and potential routes to address ACEs, it will only be useful if it points to practical, concrete, scalable strategies that can be sustained over time. The public health prevention continuum runs along the base of the ACEs LCHD Framework. When planning and designing interventions we suggest taking a vertical ‘slice’ through the framework to identify multilevel relationships among risks, assets and actors. This analysis helps identify key stakeholders, recognize strengths, resilience patterns and vulnerabilities at child, family, community and system levels, clarify leverage points, enable collaborative efforts and select appropriate measures to track outcomes.

The goal of transforming a complex dynamic system is to change the underlying configuration of the system, enabling new patterns of behavior and outcomes to emerge. Although transformation can be pursued through a variety of approaches, success depends on a coalition of people working collectively, taking coordinated action, and engaging in ongoing learning as the system evolves.

The coalition should be intentionally diverse, including child health clinicians, families, community members, and others who influence or experience the system. Beginning at a small scale can help develop the collective capabilities needed for transformation — whether in a single community, through one early childhood center or by undertaking a discrete action within a larger system. Meaningful change is often achieved through the accumulation of multiple interventions and reinforcing actions over time. The specific starting point is less important than taking the first step. Much like a ‘choose-your-own-adventure’, systems transformation can begin from many different entry points, with progress guided by shared principles, coordinated action, and ongoing cycles of learning and adaptation.

A four-step action cycle with suggestions for application which cover research, policy and practice is described below and summarized in Figure 4.

Figure 4:

ACEs prevention and mitigation four-step action cycle.

1. Create developmental ecosystems maps

The ACEs LCHD Framework demonstrates how ACEs develop within complex relational developmental ecosystems. Mapping these ecosystems across child, family, neighborhood, community and regional levels includes identifying both assets and challenges, revealing how reciprocal relationships within and between layers can either trigger or buffer adversity.

Getting started:

For a group to collectively act they first need to visualise how the developmental ecosystem is functionally operating and the outcomes it is producing. While this can seem daunting there are many ways to go about this by using tools to gather information. One approach is to use a population-based measure such as the Early Development Instrument (EDI)⁴⁴ which measures children’s developmental health and to map it by neighborhood conditions, using the National Neighborhood Equity Index (NNEI),⁴⁵ supplementing it with mapping of community assets and qualitative data gathered from interviews with community members.

Application:

• A central organization e.g., a local public-health department or cross-sector coalition can convene interdisciplinary partners to co-produce ecosystem maps.

• Maps could include community assets as well as considerations of historic events and political and cultural influences. Mapping platforms could enable standardized outer-layer maps (macro-level) that local providers customize for inner-layer (micro-level) family contexts. Ideally, providers who are working with families from across disciplines - health, education, social work, psychology - would co-develop the inner layers of these maps with the families themselves, sensitively addressing the challenges and identifying family strengths and opportunities for change that could strengthen developmental trajectories. The maps would include key relationships with caregivers, wider family members, peers, teachers and health and social care professionals that play a role in the child’s relational developmental ecosystem. This collaborative approach could reduce the burden on child health provider time while providing rich contextual information to increase the relevance and effectiveness of tailored interventions.

• Mapping should move beyond simple linear ‘risk → outcome’ models and apply complex systems analysis to capture feedback loops, adaptation and emergent patterns⁴⁶ Mapping processes should inform collection of near-real-time metrics at family, service and policy levels to guide iterative action.

• Participatory approaches e.g., the Tarboro ACEs enquiry in rural North Carolina,⁴⁷ show how communities can self-map and identify root causes of ACEs, causal loops and opportunities for healing intergenerational trauma.

• State-wide approaches, such as in New Mexico, have applied the EDI and NNDI alongside early childhood policy reforms to enable them to gather a baseline of the current state and to measure impact of these reforms over time.⁴⁸

• Child and youth impact assessments (CYIA) offer structured analytic tools for specifying the risks inherent in a child’s developmental ecosystem.⁴⁹

2. Address root causes and mitigate the impact of ACEs on health development trajectories.

ACEs impacts are not linear; they often exhibit patterns of reinforcement and reciprocity that amplify over time. Intergenerational trauma shapes not only relational vulnerabilities but also family routines and cultural norms.^50-53

Next steps:

The tools deployed in the first step help illuminate the ecosystem, enabling the coalition to engage in sensemaking and discern emergent patterns, relationships, and underlying themes. This illumination supports this next step which requires a deeper investigation of the system, including its boundaries, structures, processes, information flows, and layers of influence.⁵⁴ By examining how these elements interact with broader social, cultural, institutional, and organizational contexts, the coalition can develop a more comprehensive understanding of the factors driving current outcomes and identify the root causes that need to be addressed to achieve meaningful and lasting change.⁵⁵

Application:

• Use trajectory tools (latent class, sequence analysis) to model intergenerational and historic adversities.^51,53

• Deploy CYIAs⁴⁹ to assess policy impacts on developmental ecosystems.

• Emphasize perinatal prevention strategies and developmental scaffolding throughout childhood.

• Support providers with updated, high-fidelity evidence on effective interventions, especially those targeting relational health, emotional regulation and co-regulation.⁵⁶

• Ensure fiscal support for training of local providers to deliver effective evidence-based interventions that spread and scale at population level.

• Develop and implement ‘second chance’ interventions aimed at ‘re-learning’ adaptive health, communication and relational behaviors in adolescence and young adulthood for those many children who emerge from ACEs on adverse trajectories. Building key capacities ‘missed’ earlier in childhood can break intergenerational cycles.

3. Identify and act on leverage points.

A developmental ecosystem map can highlight leverage points where interventions will be most impactful. Leverage points are places in a complex system where targeted action can produce large and lasting change across the whole system.⁵⁷

Next steps:

This step requires the coalition to reach agreement on where to begin taking action through transparent and inclusive processes. Particular effort should be made to engage those most directly affected, in this case by childhood ACEs, helping to test assumptions, validate insights, and build confidence in the proposed approach. Sharing data, insights, and options through community meetings, workshops, stakeholder forums, public displays, and online platforms can foster participation, strengthen consensus, and build collective ownership of the path forward.

Application:

• Through a shared process with stakeholders, achieve a shared understanding of drivers to enable the co-design of interventions to support protective pathways.

• Facilitate completion of causal loop mapping with stakeholders and families to identify leverage points and co-design interventions.

• Identify and act on secondary prevention leverage points such as early family supports and stress management pathways to prevent adverse sequelae after exposure to ACEs.

• Test policy levers such as family leave, parenting programs and workplace flexibility as potential strategies to strengthen relational health.

• Apply trauma-informed principles to intervention development, especially those focused on relational health.

• Co-design interventions targeting leverage points with families and professionals and tailor them to local and familial contexts.

4. Enable collaborative action.

The ACEs LCHD Framework is child-centered, offering a unifying focus for diverse stakeholders. Those most proximal to the issues can work in partnership with interdisciplinary professionals guided by this framework to co-develop and test interventions.

Next steps:

The meaningful participation of key stakeholders is fundamental to achieving and sustaining system change. This requires identifying relevant actors and establishing mechanisms for engagement that are both accessible and achievable. Thoughtful design of participation processes can help foster inclusion, strengthen collective commitment, and enhance the effectiveness of implementation efforts. Small tests of change can be monitored for impact and successful strategies spread and scaled. A series of even small “nudges” can have a large impact on a complex system.

Application:

• Child health providers can contribute data, advocate for trauma-informed practice and connect families to interventions.

• Place-based exemplars e.g., All Children Thrive Cincinnati,⁵⁸ All Children Thrive California,⁵⁹ Pomona Early Childhood Accelerator⁶⁰ show how local coalitions can redesign developmental ecosystems. Community coalitions such as these work across sectors to optimize conditions for children’s health development across all ecosystem layers.

• Implementation requires systems and implementation-science approaches, sustained engagement and distributed governance.^61-64

• Structured large group dialogues such as World Café events^65,66 help stakeholders to ‘see themselves in the picture’ and accept shared accountability.

Applying the ACEs LCHD Framework at each of the four steps described above will help to identify multi-level and multi-sector opportunities, enable collaborative place-based strategies, develop action plans and influence policy development.

Limitations

This exposition of the ACEs LCHD Framework has outlined what gives rise to ACEs, how they exert impact and where accessible leverage points may lie. The current evidence-base will continue to evolve as research and implementation experience accumulate, further refining its explanatory and predictive power. Its utility depends on adoption as a common cross-disciplinary guiding framework and on its translation into concrete place-based action.

Effective implementation will require:

• Broad uptake across health, education and social sectors.

• Equal partnerships with families and communities.

• Significant realignments in strategy, policy and funding.

We acknowledge three additional limitations:

1. Measuring developmental ecosystems at sufficient scale and granularity remains methodologically challenging.

2. The ACEs literature already contains many overlapping frameworks; without clear differentiation, this framework could be perceived as ‘one more’. We argue that its added value lies in providing an integrative synthesis that unites biological, relational and ecological process across developmental time.

3. Evaluating system-level transformation requires new metrics capable of tracking change across multiple ecosystem layers.

Conclusions

ACEs emerge from the innermost layers of the child’s developmental ecosystem, the family and close relationships they turn to for security and nurturing. Yet the root causes of ACEs often lie in distal ecosystem layers that shape parents’ ability to provide security and care. Coordinated, mutually reinforcing policy initiatives are required for transformative change.

The ACEs LCHD Framework shows how early life experiences are formative, yet not deterministic. Multiple opportunities exist across the life course to shift trajectories, scaffold improvement and support thriving.⁶⁷ Preventing and mitigating ACEs requires innovative, creative and boundary crossing approaches and a willingness to move beyond the clinic walls towards new forms of listening, engagement and partnership.

Improving adult health and life expectancy depends in part on reducing ACEs. Prevention and intervention efforts must be intergenerational, building community strengths to provide protective experiences, disrupting toxic stress and reducing allostatic loads. This relational and ecological approach is likely to yield greater health returns than any single biomedical intervention.

Mapping a child’s developmental ecosystem may one day be as routine in pediatric practice as plotting height and weight. Investments to address ACEs have potential to save billions of dollars on adult chronic disease costs while enabling children and families to flourish. By using the Life Course Health Development approach to reframe ACEs within a developmental ecosystem and life course lens, the ACEs LCHD Framework shifts the field from documenting harm to designing ecosystems where every child can thrive.