The following is from Children’s Health Defense.

A new peer-reviewed paper challenges the long-standing claim that autism is primarily a genetic neurological disorder. Instead, the authors conclude autism arises from complex interactions among immune, neurological, gastrointestinal, metabolic, and environmental factors.

The paper, published Dec. 20 in Molecular Neurobiology, reviewed 519 studies. Its authors include Children’s Health Defense Chief Scientific Officer Brian Hooker, Ph.D., and physician-scientist Martha Herbert, M.D., Ph.D.

Rather than focusing on a single “autism gene” or viewing autism as fixed at birth, the researchers describe it as a whole-body condition that can evolve over time. They argue autism may be dynamic and, in some cases, biologically modifiable.

A major focus of the review is immune system dysfunction. The authors cite evidence of chronic neuroinflammation, abnormal immune signaling, autoantibodies that target brain tissue, and maternal immune activation during pregnancy — all linked to altered neurodevelopment.

“This paper solidifies the immunological aspects of the etiology of autism and refutes any past notion that the disorder does not stem from neuroimmune activation and autoimmunity.”
— Brian Hooker, Ph.D., Children’s Health Defense

The paper also questions decades of genetic-focused research. Despite more than $1 billion invested by organizations such as Autism Speaks and the Simons Foundation, no genetic explanation has been found that accounts for autism’s rising prevalence or wide variation.

Instead, the authors point to cumulative environmental stressors — including exposure to heavy metals, industrial chemicals, pesticides, medications during pregnancy, endocrine disruptors, and other toxic exposures — particularly during critical windows of development.

Disruptions in the gut microbiome are highlighted as another key factor. Many autistic children experience gastrointestinal problems, and research shows connections between gut imbalance, immune signaling, and behavioral symptoms through the gut-brain axis.

The authors challenge the assumption that differences observed in autistic brains are purely congenital. They suggest these changes may result from inflammation, oxidative stress, and metabolic dysfunction — processes that can change over time.

They also criticize the “magic bullet” model of autism treatment, which emphasizes symptom management with single-target drugs while ignoring underlying biological complexity.

“Novel therapeutics to address core symptoms of autism spectrum disorder have been largely ignored by mainstream medicine and are desperately needed.”
— Brian Hooker, Ph.D.

The researchers call for a precision medicine approach that considers immune markers, metabolism, microbiome health, environmental exposures, and individual biology to better support people on the autism spectrum.

They emphasize their goal is not to diminish neurodiversity, but to better understand the biological challenges many autistic individuals face — with the aim of improving health outcomes and quality of life.

For more information, read the full article here.