Science Vs

Autism: The Real Reason It's Going Up

June 19, 2025

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  • The "autism epidemic" is largely explained by an expanding diagnostic definition that now includes milder forms of autism, rather than an increase in severe cases, which have remained stable or declined. 
  • While environmental factors like air pollution and microplastics are being investigated, current research does not provide a "smoking gun" to explain the rise in autism diagnoses, and vaccines have been definitively ruled out. 
  • Increased awareness, routine pediatrician screenings, and a broader understanding of autism's presentation in girls and minority groups have contributed to more individuals receiving diagnoses, which many in the autistic community view positively as it leads to better support and understanding. 

Segments

Autism Diagnosis Evolution
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(~00:00:37)
  • Key Takeaway: The definition of autism has significantly broadened since the 1960s, moving from a narrow focus on severe intellectual disability and non-verbal communication to encompassing a wider spectrum of traits and presentations.
  • Summary: The conversation begins by introducing the topic of autism and the rising diagnosis rates. It then delves into the historical understanding of autism, starting from the 1960s when it was often conflated with schizophrenia and characterized by severe intellectual disability and visible traits. The evolution of diagnostic criteria in the DSM is discussed, highlighting how the definition expanded in 1987 to include a looser collection of traits, and how Asperger’s syndrome was later integrated into Autism Spectrum Disorder.
Potential Causes Explored
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(~00:37:33)
  • Key Takeaway: While environmental factors are considered, the primary driver for the observed increase in autism diagnoses is attributed to changes in diagnostic criteria and increased awareness, not a rise in severe cases or specific environmental toxins.
  • Summary: This segment addresses various theories for the rise in autism diagnoses, including environmental toxins, plastics, and screen time. It debunks the link between vaccines and autism. The discussion then shifts to the idea that the increase is largely due to a broader diagnostic net, with research showing that milder forms of autism have increased, while severe cases have not. The role of increased awareness and routine screening is also mentioned.
Broader Diagnosis and Community Impact
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(~00:38:03)
  • Key Takeaway: The expansion of autism diagnosis has led to greater recognition and support for individuals, particularly girls and minority groups who were previously underdiagnosed or misdiagnosed, fostering a more inclusive understanding of neurodiversity.
  • Summary: This part of the conversation focuses on how the evolving understanding of autism has led to better identification in populations previously overlooked, such as girls and minority groups. It highlights instances of misdiagnosis (e.g., bipolar disorder) and the positive impact of accurate diagnoses on individuals’ lives and their access to appropriate support. The segment concludes with a positive outlook on the growing population of well-adjusted autistic individuals and the pushback against stigmatizing language.