Scientist Reacts to Greg Doucette's Controversial Take on DEXA Scans

Video Description

Subscribe to our channel: https://www.youtube.com/@optispan Related episodes: Why DEXA Scans Are NOT the HOLY GRAIL of BODYFAT Testing - Science Explained: https://www.youtube.com/watch?v=2Gg4Jm5KS1Y Are DEXA scans ACCURATE? What YOU NEED to KNOW: https://youtu.be/SsDJZMlM1ko The UNEXPECTED Ozempic Weight Loss Body Scan Results (DEXA): https://youtu.be/C_Z7qPVRA5M Coach, bodybuilder, and powerlifter Greg Doucette published a video on his Youtube channel discussing what he sees as the shortcomings of DEXA scans and why DEXA scans are not, in his opinion, the gold standard of body composition measurement. He bases his views on personal experience as well as his interpretation of a 2019 study that examined how closely DEXA and MRI measurements correlate. In this episode, Matt reacts to Greg's video and presents his own opinion about the validity of DEXA scan measurements. Together with Nick, he discusses what DEXA scans do and don't measure, potential sources of inaccuracy in DEXA scans, honest interpretations of scientific literature, and more. A DEXA (dual-energy X-ray absorptiometry) scan is an advanced imaging procedure for measuring bone density and composition. DEXA scans utilize two different energy levels of low-dose X-ray beams—one absorbed mostly by soft tissue, and the other absorbed mainly by bone—to differentiate between bone, fat, and lean tissue. In so doing, they provide noninvasive and detailed information about bone health, risk of osteoporosis or fractures, and body composition. While medical practitioners typically perform DEXA scans on the lower spine and hips, they can also perform DEXA scans on the whole body for the purposes of early detection and intervention. 0:00 Introduction 2:34 Defining accuracy and precision 6:38 The video begins 7:03 Is the naked eye more accurate than a DEXA scan? 10:20 "Studies half the time are wrong"—true or false? 12:44 MRIs vs DEXA scans 15:40 What does a DEXA scan actually measure? 19:26 When DEXAs don't line up with what you see/feel 21:12 Data showing the correlation between MRI and DEXA measurements 26:06 The use of DEXA scans in clinical trials 30:49 Why where you store fat matters 32:33 Final thoughts on the video Producers: Tara Mei, Nicholas Arapis Video Editor: Jacob Keliikoa DISCLAIMER: The information provided on the Optispan podcast is intended solely for general educational purposes and is not meant to be, nor should it be construed as, personalized medical advice. No doctor-patient relationship is established by your use of this channel. The information and materials presented are for informational purposes only and are not a substitute for professional medical advice, diagnosis, or treatment. We strongly advise that you consult with a licensed healthcare professional for all matters concerning your health, especially before undertaking any changes based on content provided by this channel. The hosts and guests on this channel are not liable for any direct, indirect, or other damages or adverse effects that may arise from the application of the information discussed. Medical knowledge is constantly evolving; therefore, the information provided should be verified against current medical standards and practices. More places to find us: Twitter: https://twitter.com/optispanpodcast Twitter: https://twitter.com/optispan Twitter: https://twitter.com/mkaeberlein Linkedin: https://www.linkedin.com/company/optispan https://www.optispan.life/ Hi, I'm Matt Kaeberlein. I spent the first few decades of my career doing scientific research into the biology of aging, trying to understand the finer details of how humans age in order to facilitate translational interventions that promote healthspan and improve quality of life. Now I want to take some of that knowledge out of the lab and into the hands of people who can really use it. On this podcast I talk about all things aging and healthspan, from supplements and nutrition to the latest discoveries in longevity research. My goal is to lift the veil on the geroscience and longevity world and help you apply what we know to your own personal health trajectory. I care about quality science and will always be honest about what I don't know. I hope you'll find these episodes helpful!