In a recent study published in Nature Mental Health, researchers looked at the impact of childhood bullying on adolescent mental health. They found that bullying led to increased mental health problems in late adolescence, partially mediated by the development of interpersonal distrust during middle adolescence, in line with the predictions of social security theory (SST).
Record
Child and adolescent mental health has become a pressing public health issue, with one in four experiencing significant depressive symptoms worldwide. In the US, alarming rates of persistent depression, suicide planning and attempts among high school students show an alarming upward trend. SST suggests that maintaining social ties is vital to human health, while threats such as bullying and rejection lead to various health problems. Research shows that social acceptance promotes well-being, while rejection experiences engage neural circuits that affect the immune system, potentially leading to long-term mental and physical health challenges.
Peer bullying, a widespread issue worldwide, significantly affects both the physical and mental health of children and adolescents. Previous research shows causal links between bullying and various mental health challenges, such as substance use, anxiety, depression, self-harm, and suicidal behaviors, along with negative academic outcomes, such as low achievement and self-esteem. Addressing bullying could include interventions to eliminate bullying itself, with school programs showing reductions of up to 16%, although effectiveness varies. Alternatively, a focus on mitigating the negative effects of bullying could include understanding pathways linking bullying and mental health, such as addressing sleep, diet, physical activity, and interpersonal trust, which are often neglected in intervention strategies .
Addressing this need, the researchers in the present study tested the predictions of Social Security Theory and examined how interpersonal distrust mediated the effects of childhood bullying on mental health difficulties in adolescence. In addition, they compared the role of mistrust with other potential mediators such as diet, sleep, and physical activity.
About the study
The study used the Millennium Cohort Study (MCS) sample, which represents socio-economically diverse areas and ethnicities across the UK. Data were collected through parent interviews and self-administered questionnaires. The cohort consisted of 10,000 members, mostly singletons or first-born twins or triplets, who provided valid data on self-reported peer bullying at age 11. Approximately 51% of cohort members were female. Mental health at age 17 was assessed by peer bullying experiences at age 11 and levels of interpersonal distrust at age 14.
The frequency of peer bullying was measured by asking cohort members how often other children hurt or picked on them on purpose, with responses ranging from “most days” to “never”. Interpersonal distrust was measured on a scale of 0 to 10, with lower values indicating higher trust and grouped into low (≤3), medium (4–8), and high (≥9) categories based on cutoff values . The primary outcome variable was the total score derived from the 20-item Strengths and Difficulties Questionnaire (SDQ) completed by cohort members at age 17, assessing emotional, peer, conduct, and hyperactivity/attention problems. The total score ranged from 1 to 40, with good internal reliability, and was further categorized into internalizing (INT) and externalizing (EXT) problems.
Along with interpersonal distrust, the other mediators examined were diet (mainly fruit consumption), sleep (evening chronotype), and physical activity. Control variables included gender, ethnicity, socioeconomic characteristics, body mass index, neighborhood ecology, maternal mental health, vocabulary ability, prior mental health difficulties, and area air pollution levels, all known to related to adolescent mental health outcomes. Analyzes included correlation analysis, as well as structural equation models with multiple imputation to handle missing data.
Results and discussion
The study revealed associations between peer bullying, interpersonal distrust, chronotype, eating habits, and total, INT, and EXT mental health difficulties. Bullying at age 11 was associated with increased mental health problems at age 17, with direct and indirect effects mediated through interpersonal distrust. Interpersonal distrust showed the strongest indirect relationship with mental health difficulties. Furthermore, the relationship between interpersonal distrust and mental health problems was stronger than that between bullying and overall mental health problems. It is worth noting that men experienced fewer emotional and peer problems than women.
Study limitations include lack of detailed temporal information, reliance on self-reported mental health assessments, lack of causal inferences, and simplified measures of peer bullying and interpersonal trust. Further research is needed to investigate biological processes, such as oxytocin dysregulation, that link peer bullying, distrust, and mental health in youth.
conclusion
In conclusion, findings reveal that interpersonal distrust is a significant contributor to mental health difficulties in adolescence and mediates the relationship between childhood bullying and later mental health problems. They highlight the importance of addressing issues of trust in bullying interventions, providing critical insights into mitigating social-emotional problems among adolescents.
