A study published in the Journal of Affective Disorders on Jul. 14 outlines a methodology for identifying biological and clinical vulnerability profiles in children and adolescents exposed to maltreatment. The research, led by Lourdes Fañanás of the University of Barcelona, found that abused children remain in a prolonged state of alert, affecting neuroendocrine, immune, and metabolic systems.
The phenomenon known as allostatic load describes cumulative wear on biological systems due to prolonged stress responses. The study analyzed 187 children and adolescents aged 7 to 17 who had experienced various forms of abuse or neglect. "All these experiences were analysed cumulatively by creating an index, as it has been shown that, in practice, many do not occur in isolation in a child's life story, but rather in combination," said Laia Marques-Feixa, the article's lead author.
Researchers designed an index using ten biomarkers from different body systems to reflect allostatic load. They found that abused children had more biomarkers above risk thresholds compared to the general population. A particularly informative combination—high diurnal cortisol levels, elevated serum C-reactive protein (CRP), and higher waist-to-height ratio—was identified as AL3 within the study. "This combination could help identify profiles of greater biological and clinical vulnerability in children and adolescents who have been exposed to abuse," the authors explain.
Fañanás noted that recent studies suggest part of the link between early maltreatment and brain changes may be explained by intermediary pathways such as low-grade systemic inflammation or metabolic factors like body mass index or abdominal adiposity. Findings on allostatic load contribute further understanding about how early-life stress can become biologically embedded and connected with mental health problems during childhood or adulthood.
The paper concludes that child maltreatment should be viewed as a cross-cutting vulnerability factor manifesting mainly through psychological distress or difficulties with emotional regulation rather than specific psychiatric diagnoses at early ages. While no differences were observed between boys' and girls' outcomes so far, researchers highlight the importance of studying gender impacts during puberty due to hormonal changes.
