How to Use Cold & Heat Exposure to Improve Your Health | Dr. Susanna Søberg
Huberman Lab Podcast Recap
Published:
Duration: 3 hr 16 min
Guests: Dr. Susanna Søberg
Summary
Dr. Susanna Søberg discusses how deliberate cold and heat exposure can enhance metabolism and improve health. Her research identifies effective protocols for activating brown fat and provides insights into cultural practices surrounding these exposures.
What Happened
Dr. Susanna Søberg completed her doctoral research at the University of Copenhagen, where she studied how deliberate exposure to cold and heat can enhance human metabolism, particularly through the activation of brown fat. Her seminal study, published in Cell Reports Metabolism in 2021, identified minimum thresholds for this exposure that lead to increased brown fat thermogenesis.
Cold exposure activates the sympathetic nervous system and stimulates the production of catecholamines, such as dopamine, epinephrine, and norepinephrine, which have positive effects on mood and metabolism. The study found that cold water immersion is more effective than cold air in activating brown fat due to closer contact with skin receptors.
Søberg's research details three pathways for brown fat activation: skin-to-hypothalamus signaling, direct receptor-to-fat activation, and muscle shivering. Shivering, in particular, increases metabolism and releases succinate, which further activates brown fat.
The Soberg Principle, which emphasizes ending cold exposure sessions with a cold phase, maximizes the body's thermogenic response and leads to long-lasting metabolic benefits. Søberg's findings indicate that just 11 minutes of cold exposure per week can significantly enhance insulin sensitivity and glucose clearance.
Cultural practices in Scandinavian countries, such as winter swimming and minimal clothing during temperature changes, are rooted in these physiological benefits. These practices contribute to higher fitness levels and improved immune responses among populations in these regions.
Sauna use, another form of deliberate heat exposure, was discussed as beneficial for cardiovascular health. Sessions of 10-15 minutes in an 80°C sauna were shown to increase heat shock proteins, which repair cells and boost metabolism without the need for excessive duration.
Søberg's ongoing studies aim to refine protocols for both men and women, recognizing that biological differences may require tailored approaches. Her work continues to explore the dynamic nature of biological processes and how varying cold exposure can keep the body's systems optimally tuned.
Key Insights
- Dr. Susanna Søberg's research identified that 11 minutes of cold exposure per week, divided into 1-2 minute sessions, is effective for enhancing insulin sensitivity and activating brown fat.
- Cold exposure triggers the sympathetic nervous system, increasing catecholamines like dopamine and norepinephrine, which improve mood and metabolic rate.
- Cultural practices in Scandinavia, such as winter swimming and minimal clothing, utilize physiological principles of cold exposure to enhance fitness and immune response.
- Sauna exposure of 10 to 15 minutes at 80°C increases heat shock proteins, aiding cellular repair and boosting metabolism, with sessions longer than 30 minutes offering no additional benefits.