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A new study provides evidence that childhood trauma may leave long-lasting traces on the body’s metabolism. Researchers found that adults who experienced trauma in childhood showed a consistent pattern of changes in their blood chemistry. These changes were observed even decades later and seemed to intensify with the severity of the trauma. The findings, published in Biological Psychiatry, suggest a biological link between early-life adversity and increased risk for physical and mental health conditions later in life.
The research team focused on the metabolome, which refers to the complete set of small molecules in the body known as metabolites. These include sugars, amino acids, lipids, and other chemical compounds that are produced as the body digests food, processes medications, or carries out routine functions such as repairing tissues or managing stress.
In essence, metabolites are the chemical fingerprints of all the biological processes happening in the body at a given time. They provide a snapshot of how the body is functioning — or malfunctioning — at the molecular level. Because they reflect real-time changes in the body’s internal state, metabolite levels can offer early clues about disease risk, inflammation, nutrient imbalances, and stress-related disruptions.
Studying the metabolome provides a way to understand how life experiences, including trauma, influence long-term health at the molecular level. Previous studies have shown that childhood trauma is linked to an increased risk for heart disease, diabetes, and mental illnesses such as depression. Although psychological and behavioral explanations exist, biological changes might also play a role.
However, earlier research in this area was limited in scope, often involving small groups of people and focusing on only a few types of trauma or specific metabolites. The current study aimed to address these limitations by analyzing a wide range of metabolites in a large sample of adults.
The researchers used data from nearly 3,000 adults who were part of a long-term health study in the Netherlands. Participants gave blood samples at two time points: once at the beginning of the study and again six years later. These samples were analyzed using a method that screened for over 800 metabolites in the blood.
Childhood trauma was assessed through interviews, which asked participants whether they had experienced emotional, physical, or sexual abuse or emotional neglect before the age of 16. Each participant received a score based on how many types of trauma they had experienced and how often.
The analysis found 18 metabolites that were significantly associated with childhood trauma. Nine were found at higher levels in individuals with trauma histories, and nine were found at lower levels. These differences tended to be larger in people who had experienced more severe trauma, suggesting a dose-response relationship.
Some of the metabolites that were elevated included compounds involved in the breakdown of fatty acids and certain amino acids. These compounds—such as 2-methylbutyrylcarnitine and propionylcarnitine—play a role in how the body generates energy and processes nutrients. Their increased levels may indicate changes in how the body handles fats and proteins, possibly hinting at mitochondrial inefficiency or other forms of metabolic stress.
Other altered metabolites were related to the body’s stress system. Cortisol and cortisone, two hormones released by the adrenal glands during stress, were found at lower levels in individuals with childhood trauma. These hormones are part of the hypothalamic-pituitary-adrenal (HPA) axis, a system that helps regulate how the body responds to stress. Lower levels might reflect long-term changes in this system, which could contribute to physical and emotional health problems.
Some of the metabolites identified—such as stachydrine and 1-stearoyl-GPC—have previously been linked to conditions like cardiovascular disease or depression. But six of the 18 metabolites associated with childhood trauma had no clear links to depression in this study, suggesting that trauma may affect the body in ways that are not entirely explained by mental health conditions.
To check the reliability of their findings, the researchers repeated the analysis using a different trauma questionnaire given to the same participants four years later. They also looked at a separate group of 308 people who were related to the original participants. The results remained consistent, especially within the same group over time, though the replication in the second group was somewhat weaker.
The researchers also examined whether the observed metabolic changes might simply be due to related health behaviors or conditions, such as body weight or use of cholesterol-lowering drugs. When they adjusted for these factors, the results remained largely the same, suggesting the effects were not merely due to these other health-related variables.
Finally, the researchers compared the metabolomic signature of childhood trauma to the one associated with depression. While there was some overlap, many of the trauma-related changes were stronger or unique. This suggests that the biological effects of childhood trauma are not just a reflection of depression but may involve distinct pathways.
While the study had many strengths—including a large sample size, long-term follow-up, and replication using multiple methods—it also had some limitations. Most participants were of North-European descent, which limits how well the findings apply to other populations. In addition, the study grouped different types of trauma into a single score, which may have obscured whether specific types of trauma affect the metabolome in different ways.
The researchers did not account for dietary habits, which are known to influence metabolite levels and could differ between people with and without trauma histories. Since trauma can affect eating behaviors, this might have played a role in the observed differences.
Another limitation is that the study excluded individuals with psychiatric conditions other than depression or anxiety, such as post-traumatic stress disorder. Since PTSD has been linked to metabolic dysfunction in other research, future studies might explore how it interacts with childhood trauma to affect the metabolome.
Despite these limitations, the findings provide evidence that early-life trauma leaves a lasting imprint on the body’s metabolism. The affected metabolites appear to involve energy production, fat and protein processing, and stress hormone regulation. These biological changes may help explain why people who experience childhood trauma are more likely to develop a range of health problems later in life.
Future research could explore whether these metabolite patterns can help identify individuals at risk for disease, and whether interventions—such as diet, exercise, or stress management—might reverse or reduce the biological effects of trauma. Understanding the long-term impact of childhood adversity on the metabolome could open new doors for prevention and treatment strategies targeting both mental and physical health.
The study, “The Metabolomic Signature of Childhood Trauma,” was authored by Camille Souama, Femke Lamers, Yuri Milaneschi, Rick Jansen, Christiaan H. Vinkers, Erik J. Giltay, Boadie W. Dunlop, Rima Kaddurah-Daouk, Brenda W.J.H. Penninx, and the Mood Disorder Precision Medicine Consortium.