Anderson, George, Maes, Michael, Berk, Michael · Medical hypotheses · 2012 · DOI
This review examines why people with ME/CFS, depression, and somatization (a condition involving unexplained body symptoms) often experience similar physical symptoms like fatigue, pain, and autonomic problems. The researchers found evidence that these symptoms arise from real biological changes in the body, including immune system activation and changes in how the body processes an amino acid called tryptophan. This suggests these seemingly different conditions may share common biological pathways rather than being purely psychological.
This study provides a biologically grounded framework for understanding ME/CFS as an organic disease with measurable immune and metabolic dysfunction, rather than a purely psychiatric condition. This reframing has important implications for how ME/CFS is diagnosed, researched, and treated, supporting the development of targeted immunological and metabolic therapies rather than relying solely on psychotherapy.
This review does not prove causality—it identifies biological associations and shared mechanisms across conditions without establishing which abnormalities directly cause symptoms. The narrative review design cannot definitively establish whether inflammation and TRYCAT pathway changes are primary drivers of symptoms or secondary consequences. It does not validate new diagnostic criteria or prove that current DSM-IV psychiatric classifications of these conditions are incorrect.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Anderson, George, Maes, Michael, & Berk, Michael (2012). Biological underpinnings of the commonalities in depression, somatization, and Chronic Fatigue Syndrome.. Medical hypotheses. https://doi.org/10.1016/j.mehy.2012.02.023
BibTeX
@article{mecfsatlas-anderson-2012-biological-underpinnings,
author = {Anderson, George and Maes, Michael and Berk, Michael},
title = {Biological underpinnings of the commonalities in depression, somatization, and Chronic Fatigue Syndrome.},
journal = {Medical hypotheses},
year = {2012},
doi = {10.1016/j.mehy.2012.02.023},
note = {PubMed: 22445460},
url = {https://www.mecfsatlas.com/evidence/anderson-2012-biological-underpinnings},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/anderson-2012-biological-underpinnings
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