Millions of people are living with unexplained symptoms like allergies, brain fog, anxiety, and chronic fatigue without realizing the hidden cause: mast cells gone rogue. In this episode of The Human Upgrade, Host Dave Asprey sits down with leading functional medicine physician Dr. Tania Dempsey to uncover how Mast Cell Activation Syndrome (MCAS) drives inflammation, disrupts mitochondria, and sabotages metabolism—and what you can do to switch it off. 

Watch this episode on YouTube for the full video experience: 

https://www.youtube.com/@DaveAspreyBPR 

Dr. Dempsey is internationally recognized for her work in functional medicine, biohacking, and chronic illness. She co-founded the AIM Center for Personalized Medicine, has published groundbreaking research on MCAS with Dr. Lawrence Afrin, and treats some of the most complex cases of immune dysregulation, autoimmune disease, and environmental illness. Her expertise helps you understand why mast cells are the missing link in allergies, long COVID, Lyme, mold toxicity, and even hormone disruption—and how to reclaim control of your biology. 

Dave and Dr. Dempsey break down how mast cells interact with mitochondria, hormones, and the nervous system, showing how chronic inflammation accelerates aging and blocks human performance. You’ll discover why biohacking tools like fasting, ketosis, supplements, red light, cold therapy, sleep optimization, and smarter not harder lifestyle strategies all influence mast cell stability. They also explore why brain optimization, neuroplasticity, and nootropics are essential for calming inflammatory cascades, and how functional medicine provides practical solutions beyond conventional treatment. 

You’ll Learn: 

• Why mast cells are the hidden switch behind allergies, chronic inflammation, and brain fog 

• How mitochondria and mast cells work together to drive human performance—or disease 

• The connection between toxic mold, Lyme, long COVID, hormone imbalance, and MCAS 

• How supplements, fasting, ketosis, and cold therapy stabilize mast cells and boost longevity 

• Why functional medicine and biohacking are essential for complex chronic illness 

• How mast cells impact metabolism, sleep optimization, and neuroplasticity 

• The surprising link between mast cells, anxiety, and mental health symptoms 

This episode is essential for anyone serious about hacking inflammation, protecting longevity, upgrading metabolism, and achieving high performance with resilience and clarity. 

Dave Asprey is a four-time New York Times bestselling author, founder of Bulletproof Coffee, and the father of biohacking. With over 1,000 interviews and 1 million monthly listeners, The Human Upgrade is the top podcast