In January, 2012, the journal Pediatrics began the year with a bang. The prestigious scientific journal published a Policy Statement from the American Academy of Pediatrics (AAP), the largest professional association of pediatricians in the U.S.

The title of the policy statement is long: “Early Childhood Adversity, Toxic Stress, and the Role of the Pediatrician: Translating Developmental Science Into Lifelong Health.” The list of AAP committees involved in creating the document is even longer. It includes the Committee on Psychosocial Aspects of Child and Family Health; the Committee on Early Childhood, Adoption, and Dependent Care; and the Section on Developmental and Behavioral Pediatrics.

This document shook up the pediatric world. It introduced the term “toxic stress,” as near as I can tell. It consolidated all the research on the impacts of stress on early human development. And it launched numerous other studies into the impacts of toxic stress and interventions to reduce those impacts.

So what is toxic stress? The definition of toxic stress provided by the AAP is long. It is predicated on a statement that sets toxic stress apart from “positive or tolerable stress.” Toxic stress, they write, “is defined as the excessive or prolonged activation of the physiologic stress response systems in the absence of the buffering protection afforded by stable, responsive relationships.”

The “physiologic stress response systems” is a long way of saying displacement. Displacement is the body’s effort to channel the buildup of stressful energy. It is the “physiologic stress response system” that, when activated for a prolonged period of time, induces obsessive/compulsive behavior to relieve stress.

The focus of the scientific research behind the AAP policy statement is the impact of toxic stress on brain development. The AAP writes that toxic stress “disrupts brain circuitry.” In particular, the AAP says toxic stress:

• Undermines the development of coping skills needed to deal with later challenges.
• Leads to “maladaptive coping patterns” and “unhealthy lifestyles.”

Again, the AAP stresses that some stress is beneficial, and helps infants learn self-calming skills that build resilience. However, the absence of “stable, responsive relationships” that help infants recover from stressful episodes leads to toxic stress. Toxic stress can create “biological memories that increase the risk of health-threatening behaviors.”

The AAP policy statement explicitly links childhood toxic stress to “the subsequent development of unhealthy lifestyles,” including:

• substance abuse
• poor eating habits
• avoidance of physical exercise
• persistent socioeconomic inequalities
• school failure
• financial hardship
• poor health
• diabetes
• cardiovascular disease

My goodness, that is quite a litany of lifelong challenges that can be traced in part to toxic stress in infancy. Is it any wonder that children in toxic environments reach out for relief from the stress? Whether they use excessive or compulsive self-soothing behaviors, or narcotic substances that prey upon brain circuitry damaged by toxic stress, the children of toxic stress are primed for self-harming compulsive behavior.

“The reduction of toxic stress in young children ought to be a high priority for medicine as a whole and for pediatrics in particular,” according to the AAP policy statement. In their typically long fashion, they summarize the organization’s response to toxic stress:

AAP is committed to leveraging science to inform the development of innovative strategies to reduce the precipitants of toxic stress in young children and to mitigate their negative effects on the course of development and health across the life span.

The AAP calls for “more effective interventions for children with symptomatic evidence of toxic stress.” These include “trauma-based cognitive behavioral therapy” and parent-child interactive therapy, of which we have written here before. Last week, we reported on a mother-child training program involving as few as two home visits that significantly reduced the likelihood of a child being overweight at age one.

Another intervention, designed by Dr. Robert Pretlow, a Fellow of the American Academy of Pediatrics (FAAP) and the publisher of AddictionNews, is the BrainWeighve smartphone app in trials at U.C.L.A. BrainWeighve works by strengthening self-soothing skills in children so that they don’t respond to stress by overeating.

The app works in part because it is self-directed, with patients creating a list of stressors and a list of action plans to use when faced with adversity. Children have been able to use the app to eliminate one problem food at a time and to reduce snacking. 

No app can replace the stable relationship with a caregiver necessary to help children recover from stressful episodes. But the BrainWeighve app can teach children how to deal with stressful situations so they do not become toxic. The app is one of the innovations the AAP hoped to encourage with its critical policy statement.

Written by Steve O’Keefe. First published July 27, 2026.

Sources:

“Early childhood adversity, toxic stress, and the role of the pediatrician: translating developmental science into lifelong health,” Pediatrics, January 2012.

“Stress impairs cognitive flexibility in infants,” PNAS, September 28, 2015.

“How children can develop toxic stress,” UNICEF, retrieved July 22, 2026.

Image courtesy of the American Academy of Pediatrics.