Using Red Light to Improve Metabolism & the Harmful Effects of LEDs | Dr. Glen Jeffery

In this comprehensive episode of the Huberman Lab podcast, Dr. Andrew Huberman engages in a deep conversation with Dr. Glen Jeffery, a pioneering neuroscientist from University College London, about the transformative effects of light on human health. Dr. Jeffery explains how long-wavelength light—particularly red, near-infrared, and infrared—enhances mitochondrial function by energizing water within cells, leading to increased ATP production, reduced cellular aging, and improved metabolic health. He presents compelling evidence that even brief exposures to red light on the skin or eyes can significantly lower blood glucose spikes and enhance visual acuity, with benefits lasting up to five days. The discussion highlights a growing public health concern: the dominance of LED lighting in modern environments, which emits excessive short-wavelength (blue/violet) light without balancing long-wavelength infrared and red light. This imbalance, Jeffery warns, may be damaging mitochondria, contributing to metabolic dysfunction, weight gain, and neurological decline—comparable in severity to past crises like asbestos exposure. He advocates for a return to broad-spectrum lighting sources such as incandescent, halogen, and candlelight, and shares real-world data showing dramatic improvements in mood and color perception when incandescent bulbs were introduced in windowless offices. The episode also underscores the importance of avoiding lasers in consumer devices due to risks of retinal damage from light scattering, and emphasizes architectural design that supports natural and infrared-transmitting light exposure. Dr. Jeffery’s personal story of a child with mitochondrial disease showing remarkable recovery through red light therapy underscores the life-changing potential of accessible, low-cost interventions. The conversation closes with Huberman expressing deep appreciation for Jeffery’s decades of impactful research and his commitment to translating science into practical, life-enhancing protocols for the public.