In this special episode of The Drive, Peter addresses the recent headlines linking acetaminophen (Tylenol) use during pregnancy to autism in exposed children. Recognizing the confusion these claims have sparked among patients, listeners, and the broader public, Peter uses this episode to provide a framework for thinking critically about complex conditions and the research related to them. He highlights the dramatic rise in autism diagnoses over recent decades, noting that multifactorial conditions rarely have a single cause, and emphasizes the importance of resisting oversimplified explanations. Peter also stresses that humans are not naturally wired for scientific thinking, making disciplined frameworks like the Bradford Hill criteria essential for evaluating causality in epidemiology. Ultimately, he uses this framework to explore the evidence surrounding acetaminophen use during pregnancy and its potential link to autism. View show notes here: https://bit.ly/46WphTm Become a member to receive exclusive content: https://peterattiamd.com/subscribe/ Sign up to receive Peter's email newsletter: https://peterattiamd.com/newsletter/ We discuss: 0:00:00 - Intro 0:00:09 - Laying the groundwork for this discussion, the rise in autism rates, and the value in using frameworks 0:05:33 - The FDA pregnancy drug categories, where Tylenol falls within that framework, and a structured method for evaluating scientific evidence and causality 0:14:13 - What exactly are the claims being made about acetaminophen and autism? 0:15:27 - The increase in autism rates and why so many things are being linked to autism: the multiple comparisons problem 0:22:34 - Evaluating the review paper that triggered the recent concern over acetaminophen and autism 0:36:20 - Breaking down the largest studies on prenatal Tylenol exposure and autism: is there a causal link? 0:45:08 - Why observational studies can’t prove causality, the role of confounding variables, and the importance of frameworks like the Bradford Hill criteria 0:47:48 - Applying the Bradford Hill criteria: testing the case for Tylenol and autism 0:59:03 - Putting it all together to answer the question: Does acetaminophen use during pregnancy increase the risk of autism? 1:02:09 - If autism risk is overwhelmingly genetic, what explains the dramatic rise in autism diagnoses? 1:12:41 - Other risk factors for autism: parental age, maternal health, environment, and where Tylenol fits in 1:19:01 - Medication use during pregnancy: balancing risks, benefits, and FDA categories 1:23:48 - Considerations for taking Tylenol during pregnancy 1:26:53 - Final thoughts: critical thinking, balanced risk assessment, and the importance of context when evaluating medications like Tylenol during pregnancy -------- About: The Peter Attia Drive is a deep-dive podcast focusing on maximizing longevity, and all that goes into that from physical to cognitive to emotional health. With over 90 million episodes downloaded, it features topics including exercise, nutritional biochemistry, cardiovascular disease, Alzheimer’s disease, cancer, mental health, and much more. Peter Attia is the founder of Early Medical, a medical practice that applies the principles of Medicine 3.0 to patients with the goal of lengthening their lifespan and simultaneously improving their healthspan. Learn more: https://peterattiamd.com Connect with Peter on: Facebook: http://bit.ly/PeterAttiaMDFB Twitter: http://bit.ly/PeterAttiaMDTW Instagram: http://bit.ly/PeterAttiaMDIG Subscribe to The Drive: Apple Podcast: http://bit.ly/TheDriveApplePodcasts Overcast: http://bit.ly/TheDriveOvercast Spotify: http://bit.ly/TheDriveSpotify Google Podcasts: http://bit.ly/TheDriveGoogle Disclaimer: This podcast is for general informational purposes only and does not constitute the practice of medicine, nursing, or other professional healthcare services, including the giving of medical advice. No doctor-patient relationship is formed. The use of this information and the materials linked to this podcast is at the user's own risk. The content on this podcast is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Users should not disregard or delay in obtaining medical advice for any medical condition they have, and they should seek the assistance of their healthcare professionals for any such conditions. I take conflicts of interest very seriously. For all of my disclosures and the companies I invest in or advise, please visit my website where I keep an up-to-date and active list of such companies. For a full list of our registered and unregistered trademarks, trade names, and service marks, please review our Terms of Use: https://peterattiamd.com/terms-of-use/