Study Suggests Depression May Begin With Energy Problems in Brain Cells

A new study published in Translational Psychiatry suggests that Major Depressive Disorder (MDD) may be linked to unusual changes in how the body's cells produce and manage energy. The findings could open new possibilities for earlier diagnosis and more targeted treatments for depression.

The research was conducted through a collaboration between scientists at the University of Queensland and the University of Minnesota. Researchers focused on Adenosine Triphosphate (ATP), often called the “energy currency” of cells because it powers essential biological processes. The team examined ATP levels in both the brain and blood cells of young adults diagnosed with depression.

The study involved 18 participants aged 18 to 25 who had been diagnosed with MDD. Scientists collected brain scans and blood samples from these individuals and compared them with samples from people without depression. According to researchers from the Queensland Brain Institute, this is the first time similar energy-related molecular patterns have been identified in both the brain and bloodstream of young people with depression.

Interestingly, the results revealed unexpected cellular behavior. Cells from individuals with depression produced higher levels of energy molecules while at rest. However, when exposed to stress, these cells struggled to increase energy production. This suggests that the cells may be working harder than normal early in the illness but lack the ability to respond effectively when energy demand rises.

Researchers believe this reduced flexibility in cellular energy production may be linked to symptoms such as fatigue, low motivation, and slowed thinking—common features of depression. The findings also highlight the role of Mitochondria, the structures responsible for generating energy inside cells.

Overall, the study suggests depression may involve fundamental metabolic changes throughout the body, offering new insights that could improve understanding, reduce stigma, and guide future treatment strategies.

REFERENCE: Kathryn R. Cullen, Susannah J. Tye, Bonnie Klimes-Dougan, Hannes M. Wiesner, Roger B. Varela, Brooke Morath, Lin Zhang, Wei Chen, Xiao-Hong Zhu. ATP bioenergetics and fatigue in young adults with and without major depression. Translational Psychiatry, 2026; DOI: 10.1038/s41398-026-03904-y