Dr. Susanna Søberg: How to Use Cold & Heat Exposure to Improve Your Health | Huberman Lab Podcast

Deliberate cold and heat exposure function as powerful hormetic stressors that significantly enhance metabolic health and cardiovascular function. Cold exposure, such as winter swimming or cold plunges, triggers the activation of brown fat—a metabolically active tissue rich in mitochondria—which improves insulin sensitivity and facilitates glucose clearance. The "Soberg Principle" advocates ending sessions on cold to force the body to generate its own heat, thereby extending metabolic activation for hours post-exposure. Research indicates that a weekly threshold of approximately 11 minutes of cold and 57 minutes of heat is sufficient to trigger these adaptive responses without inducing chronic stress. By regularly challenging the body’s thermoregulatory system, individuals can increase brown fat density, lower blood pressure, and improve overall resilience to temperature fluctuations, ultimately resetting the body’s homeostatic balance and mitigating risks associated with sedentary, temperature-neutral lifestyles.