Your Brain On... Cold Plunges

Cold plunges are everywhere, and the way people talk about them, you'd think they're a miracle cure for your brain, body, and soul.

But in an age of algorithm-fueled evangelism, when a ritual becomes this ubiquitous and loud, we have to ask: how much of the buzz is backed by science… and how much is just marketing?

In this episode, we explore the neuroscience of cold exposure: what's real, what's overstated, and why this "discomfort" has become a billion-dollar industry.

We discuss:

Why cold plunges went viral, and how wellness movements often devolve into identity-driven cultures The difference between cold exposure itself and the monetized "cold plunge movement" What constitutes a "cult" (and how pseudoscience forms around partial truths) The real physiological cold shock response Why the mental "high" after a plunge doesn't automatically equal long-term brain benefit The cardiovascular risks that rarely get discussed, especially for people with underlying heart disease What the research suggests about soreness, pain reduction, and muscle growth (including why cold immersion can blunt hypertrophy) The real story behind brown fat Who should avoid cold plunges altogether (asthma, arrhythmias, coronary disease, vascular conditions) Joining us for this conversation is investigative journalist and bestselling author Scott Carney (What Doesn't Kill Us, The Wedge), who has spent years inside the cold exposure world, first as a skeptic, then as a believer, and eventually as a critic of the culture that formed around it. His work reveals what happens when discomfort becomes identity, and when unfounded "social media science" outruns real science.

Your Brain On... is hosted by neurologists, scientists, and public health advocates Drs. Ayesha and Dean Sherzai.

SUPPORTED BY: the 2026 NEURO World Retreat. A 5-day journey through science, nature, and community, on the California coastline: neuroworldretreat.com

Your Brain On... Cold Plunges • SEASON 6 • EPISODE 7

REFERENCES

Cold Water Immersion, Muscle Adaptation, and Recovery

Roberts, L. A., Raastad, T., Markworth, J. F., Figueiredo, V. C., Egner, I. M., Shield, A., Cameron-Smith, D., Coombes, J. S., & Peake, J. M. (2015). Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training. Journal of Physiology, 593(18), 4285–4301. https://doi.org/10.1113/JP270570

Bleakley, C. M., McDonough, S. M., & MacAuley, D. C. (2004). The use of ice in the treatment of acute soft-tissue injury: A systematic review of randomized controlled trials. American Journal of Sports Medicine, 32(1), 251–261. https://doi.org/10.1177/0363546503260757