In this podcast episode, host Louise Hazel interviews Dr. Alexis Cowan, a renowned light biologist, about the impact of light exposure on metabolism and overall health. They discuss the effects of different wavelengths of light, emphasizing the benefits of natural sunlight and the harms of artificial light, particularly blue light. Dr. Cowan provides practical tips for optimizing sun exposure, such as morning light for cortisol regulation and midday sun for vitamin D. She also addresses cultural challenges, the concept of building a solar callus, and the importance of mitigating EMF exposure. The episode concludes with a call for further research and awareness in light biology.